diff --git a/webconsole-plugins/servicediagnostics/NOTICE.txt b/webconsole-plugins/servicediagnostics/NOTICE.txt
new file mode 100644
index 0000000..3336daa
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/NOTICE.txt
@@ -0,0 +1,9 @@
+This project is using third party javascript library, under core/src/main/resources/html/js
+- graffle.js
+- graph.js
+- jquery.js
+- raphael-min.js
+
+In my understanding, these are all MIT licences.
+
+This project also uses org.json, and the scala programming language. (Both need to be wrapped into OSGi bundles, see README file)
diff --git a/webconsole-plugins/servicediagnostics/README.txt b/webconsole-plugins/servicediagnostics/README.txt
new file mode 100644
index 0000000..175a3c9
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/README.txt
@@ -0,0 +1,64 @@
+OSGi Service Diagnostics and WebConsole Plugin
+==============================================
+
+This projects aims at easing diagnostics of OSGi services and finding about missing dependencies.
+
+Typically in a large system with many cascading dependencies managed by different trackers such as DeclarativeService, DependencyManager or others, tracking the root cause of a top level service not being started can become very cumbersome. When building service oriented architectures, it is often the case that a single missing requirement will lock a full stack of services, but to find that one requirement is like finding a needle in a haystack!
+
+The basic idea here is to ask each dependency manager instance about its unresolved dependencies, merge all answers and filter the result to keep only the root causes. 
+
+Typically, if A depends on B which depends on C which depends on D, and D is nowhere to be found, I need only show the "C -> D" missing requirement; if D is resolved, then the whole stack is unlocked.
+
+Similarly, if D is known by another dependency management system, but unregistered because it depends on E which is missing, then only the "D -> E" requirement is relevant. 
+
+Project organization (core):
+============================
+* servicediagnostics: the API package. It holds the main service interface as well as the plugin interface, to extend to other dependency management systems
+
+* servicediagnostics.impl: the implementation package. It contains plugins implementations for org.apache.felix.scr and org.apache.felix.dependencymanager, as well as the main service implementation.
+
+* servicediagnostics.webconsole: a Felix WebConsole plugin that displays a graphical view of the diagnostics result. Alternatively it can also show a graph of all services currently registered in the service registry and the bundles using them. See Screenshot-notavail.png and Screenshot-all.png. 
+
+The "sample" part simply contains some test classes and a helper class to launch Felix. 
+
+How to build the project:
+=========================
+
+> mvn install
+
+How to run:
+===========
+I'm providing a simple run script just to try out the service.
+Unfortunately, org.json and scala-library don't come readily packaged as OSGi bundles, so we need to wrap them ourselves and copy these runtime dependencies into a "lib" directory under the project root:
+lib/json-osgi.jar
+lib/scala-library-osgi.jar
+
+These libraries can be easily created using Bnd:
+> java -jar bnd.jar wrap $HOME/.m2/repository/org/scala-lang/scala-library/2.8.1/scala-library-2.8.1.jar
+> mv scala-library-2.8.1.bar lib/scala-library-osgi.jar
+
+> java -jar bnd.jar wrap $HOME/.m2/repository/org/json/json/20090211/json-20090211.jar
+> mv json-20090211.bar lib/json-osgi.jar
+
+Once this is done, you can simply run:
+> ./run.sh
+
+It should display:
+[INFO] Started jetty 6.1.x at port(s) HTTP:8080
+
+You can then point your browser to 
+http://localhost:8080/system/console/servicegraph
+
+(login/password is admin/admin)
+then click on either "Unavail" or "All". 
+The "bubbles" can be dragged around for better readability. The colors are random and don't mean anything. 
+On the "All" view, arrows point from bundles to the services they use. 
+On the "Unavail" view, arrows point from a leaf component to its missing dependencies.
+
+(note: the lib directory is provided for dependencies that are not readily available as OSGi bundles from maven)
+
+Issues & TODOs:
+===============
+* use of JSONObject in Servlet.scala is a bit awkward, but Scala's native json is still incomplete.. 
+* no support for service properties; needs to be added.
+* no support for iPojo, Blueprint, basic ServiceTrackers... more plugins could be developed. I only wrote the ones i'm using.
diff --git a/webconsole-plugins/servicediagnostics/core/pom.xml b/webconsole-plugins/servicediagnostics/core/pom.xml
new file mode 100644
index 0000000..c72e3f2
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/pom.xml
@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>org.apache.felix</groupId>
+    <artifactId>servicediagnostics</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <relativePath>../pom.xml</relativePath>
+  </parent>
+
+  <groupId>org.apache.felix</groupId>
+  <artifactId>servicediagnostics.core</artifactId>
+  <version>1.0.0-SNAPSHOT</version>
+  <packaging>bundle</packaging>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.felix</groupId>
+      <artifactId>org.apache.felix.webconsole</artifactId>
+      <version>3.1.8</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.felix</groupId>
+      <artifactId>javax.servlet</artifactId>
+      <version>1.0.0</version>
+    </dependency>
+    <dependency>
+      <groupId>org.json</groupId>
+      <artifactId>json</artifactId>
+      <version>20090211</version>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.felix</groupId>
+        <artifactId>maven-bundle-plugin</artifactId>
+        <configuration>
+          <instructions>
+            <Bundle-Category>osgi</Bundle-Category>
+            <Bundle-SymbolicName>
+              ${project.artifactId}
+            </Bundle-SymbolicName>
+            <Bundle-Activator>
+              org.apache.felix.servicediagnostics.impl.Activator
+            </Bundle-Activator>
+            <Export-Package>
+              org.apache.felix.servicediagnostics;version=1.0
+            </Export-Package>
+            <Private-Package>
+              org.apache.felix.servicediagnostics.impl,
+              org.apache.felix.servicediagnostics.webconsole
+            </Private-Package>
+            <Include-Resource>
+              src/main/resources
+            </Include-Resource>
+          </instructions>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+  
+</project>
diff --git a/webconsole-plugins/servicediagnostics/core/src/main/resources/html/index.html b/webconsole-plugins/servicediagnostics/core/src/main/resources/html/index.html
new file mode 100644
index 0000000..02838d7
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/resources/html/index.html
@@ -0,0 +1,147 @@
+<!--
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+-->
+<header>
+    <script type="text/javascript" src="/servicegraph/js/raphael-min.js"></script>
+    <script type="text/javascript" src="/servicegraph/js/graffle.js"></script>
+    <script type="text/javascript" src="/servicegraph/js/graph.js"></script>
+    <script type="text/javascript" src="/servicegraph/js/jquery.js"></script>
+    <script type="text/javascript">
+<!--
+
+var _redraw;
+var height = 600;
+var width = 1000;
+
+DEBUG = false;
+debug = function (obj) { if(DEBUG && console) console.debug(obj); }
+
+var services;
+
+// from graph demo @ http://blog.ameisenbar.de/en/2010/03/02/dracula/
+function graphUnavail(json) {
+  var g = new Graph();
+
+  var empty = true;
+  for (s in json) {
+    empty = false;
+    for (i = 0; i < json[s].length; i++) {
+      // point unregistered service to dependency name
+      g.addEdge(s, json[s][i], { directed : true } );
+    }
+  }
+
+  if (empty) {
+    $("#canvas").empty().append($("<h1>").html("Service Registry status OK: No unresolved service found."));
+  } 
+  else showGraph(g)
+}
+
+function graphAllServices(json) {
+  var g = new Graph();
+
+  var empty = true;
+  for (s in json) {
+    empty = false;
+    for (i = 0; i < json[s].length; i++) {
+      // point using bundle to service name
+      g.addEdge(json[s][i], s, { directed : true } );
+    }
+  }
+
+  if (empty) {
+    $("#canvas").empty().append($("<h1>").html("Service Registry empty: no service found."));
+  }
+  else showGraph(g)
+}
+
+function showGraph(g) {
+    debug(g);
+
+    /* layout the graph using the Spring layout implementation */
+    var layouter = new Graph.Layout.Spring(g);
+    layouter.layout();
+    
+    /* draw the graph using the RaphaelJS draw implementation */
+    $("#canvas").empty();
+    var renderer = new Graph.Renderer.Raphael('canvas', g, width, height);
+    renderer.draw();
+    
+    _redraw = function() {
+        layouter.layout();
+        renderer.draw();
+    };
+}
+
+function redraw() {
+  var filter = $("#filter").val();
+  if (filter) {
+    var grep = {}; 
+    for (s in services) if (s.indexOf(filter) >= 0) grep[s] = services[s]; 
+    graphAllServices(grep);
+  } else {
+    graphAllServices(services);
+  }
+}
+
+function loadUnavail() {
+  $("#canvas").html("Loading data. Please wait...");
+  $.ajax({
+    url: "/servicegraph/json/notavail",
+    dataType: "json",
+    success: function(json){
+      services = json;
+      debug("Got services");
+      debug(json);
+      graphUnavail(json);
+    }
+  });
+}
+
+function loadAllServices() {
+  $("#canvas").html("Loading data. Please wait...");
+  $.ajax({
+    url: "/servicegraph/json/all",
+    dataType: "json",
+    success: function(json){
+      services = json;
+      debug("Got services");
+      debug(json);
+      graphAllServices(json);
+    }
+  });
+}
+
+/* only do all this when document has finished loading (needed for RaphaelJS) */
+$(document).ready(function(){
+  $("#actions")
+  	.append($("<a>").attr("href", "javascript:loadAllServices()").html("All"))
+  	.append($("<span>").html("|"))
+  	.append($("<a>").attr("href", "javascript:loadUnavail()").html("Unavail"))
+});
+
+-->
+    </script>
+</header>
+<body>
+Filter:&nbsp;<input type="text" id="filter"/><button id="redraw" onclick="redraw();">redraw</button>
+&nbsp;&nbsp;<span id="actions"></span>
+<div id="canvas"></div>
+</body>
diff --git a/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/graffle.js b/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/graffle.js
new file mode 100644
index 0000000..c0ad9eb
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/graffle.js
@@ -0,0 +1,101 @@
+/**
+ * Originally grabbed from the official RaphaelJS Documentation
+ * http://raphaeljs.com/graffle.html
+ * Changes and comments by Philipp Strathausen http://blog.ameisenbar.de
+ * Licenced under the MIT licence.
+ */
+
+/**
+ * Usage:
+ * connect two shapes
+ * parameters: 
+ *      source shape [or connection for redrawing], 
+ *      target shape,
+ *      style with { fg : linecolor, bg : background color, directed: boolean }
+ * returns:
+ *      connection { draw = function() }
+ */
+Raphael.fn.connection = function (obj1, obj2, style) {
+    var selfRef = this;
+    /* create and return new connection */
+    var color = style.fg || "#000";
+    var edge = {/*
+        from : obj1,
+        to : obj2,
+        style : style,*/
+        draw : function() {
+            /* get bounding boxes of target and source */
+            var bb1 = obj1.getBBox();
+            var bb2 = obj2.getBBox();
+            bb1.height = bb1.height + 15; /* respect the label TODO do it in a cleaner way */
+            bb2.height = bb2.height + 15;
+            var off1 = 1;
+            var off2 = 2;
+            /* coordinates for potential connection coordinates from/to the objects */
+            var p = [
+                {x: bb1.x + bb1.width / 2, y: bb1.y - off1},              /* NORTH 1 */
+                {x: bb1.x + bb1.width / 2, y: bb1.y + bb1.height + off1}, /* SOUTH 1 */
+                {x: bb1.x - off1, y: bb1.y + bb1.height / 2},             /* WEST  1 */
+                {x: bb1.x + bb1.width + off1, y: bb1.y + bb1.height / 2}, /* EAST  1 */
+                {x: bb2.x + bb2.width / 2, y: bb2.y - off2},              /* NORTH 2 */
+                {x: bb2.x + bb2.width / 2, y: bb2.y + bb2.height + off2}, /* SOUTH 2 */
+                {x: bb2.x - off2, y: bb2.y + bb2.height / 2},             /* WEST  2 */
+                {x: bb2.x + bb2.width + off2, y: bb2.y + bb2.height / 2}  /* EAST  2 */
+            ];
+            
+            /* distances between objects and according coordinates connection */
+            var d = {}, dis = [];
+
+            /*
+             * find out the best connection coordinates by trying all possible ways
+             */
+            /* loop the first object's connection coordinates */
+            for (var i = 0; i < 4; i++) {
+                /* loop the seond object's connection coordinates */
+                for (var j = 4; j < 8; j++) {
+                    var dx = Math.abs(p[i].x - p[j].x),
+                        dy = Math.abs(p[i].y - p[j].y);
+                    if ((i == j - 4) || (((i != 3 && j != 6) || p[i].x < p[j].x) && ((i != 2 && j != 7) || p[i].x > p[j].x) && ((i != 0 && j != 5) || p[i].y > p[j].y) && ((i != 1 && j != 4) || p[i].y < p[j].y))) {
+                        dis.push(dx + dy);
+                        d[dis[dis.length - 1]] = [i, j];
+                    }
+                }
+            }
+            var res = dis.length == 0 ? res = [0, 4] : d[Math.min.apply(Math, dis)];
+            /* bezier path */
+            var x1 = p[res[0]].x,
+                y1 = p[res[0]].y,
+                x4 = p[res[1]].x,
+                y4 = p[res[1]].y,
+                dx = Math.max(Math.abs(x1 - x4) / 2, 10),
+                dy = Math.max(Math.abs(y1 - y4) / 2, 10),
+                x2 = [x1, x1, x1 - dx, x1 + dx][res[0]].toFixed(3),
+                y2 = [y1 - dy, y1 + dy, y1, y1][res[0]].toFixed(3),
+                x3 = [0, 0, 0, 0, x4, x4, x4 - dx, x4 + dx][res[1]].toFixed(3),
+                y3 = [0, 0, 0, 0, y1 + dy, y1 - dy, y4, y4][res[1]].toFixed(3);
+            /* assemble path and arrow */
+            var path = ["M", x1.toFixed(3), y1.toFixed(3), "C", x2, y2, x3, y3, x4.toFixed(3), y4.toFixed(3)].join(",");
+            /* arrow */
+            if(style && style.directed) {
+                /* magnitude, length of the last path vector */
+                var mag = Math.sqrt((y4 - y3) * (y4 - y3) + (x4 - x3) * (x4 - x3));
+                /* vector normalisation to specified length  */
+                var norm = function(x,l){return (-x*(l||5)/mag);};
+                /* calculate array coordinates (two lines orthogonal to the path vector) */
+                var arr = [
+                    {x:(norm(x4-x3)+norm(y4-y3)+x4).toFixed(3), y:(norm(y4-y3)+norm(x4-x3)+y4).toFixed(3)},
+                    {x:(norm(x4-x3)-norm(y4-y3)+x4).toFixed(3), y:(norm(y4-y3)-norm(x4-x3)+y4).toFixed(3)}
+                ];
+                path = path + ",M"+arr[0].x+","+arr[0].y+",L"+x4+","+y4+",L"+arr[1].x+","+arr[1].y; 
+            }
+            
+            // applying path
+            edge.fg && edge.fg.attr({path:path}) 
+                || (edge.fg = selfRef.path(path).attr({stroke: color, fill: "none"}).toBack());
+            edge.bg && edge.bg.attr({path:path})
+                || style && style.bg && (edge.bg = style.bg.split && selfRef.path(path).attr({stroke: style.bg.split("|")[0], fill: "none", "stroke-width": style.bg.split("|")[1] || 3}).toBack());
+        }
+    }
+    edge.draw();
+    return edge;
+};
diff --git a/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/graph.js b/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/graph.js
new file mode 100644
index 0000000..268c283
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/graph.js
@@ -0,0 +1,303 @@
+/*  Graph JavaScript framework, version 0.0.1
+ *  (c) 2006 Aslak Hellesoy <aslak.hellesoy@gmail.com>
+ *  (c) 2006 Dave Hoover <dave.hoover@gmail.com>
+ *
+ *  Ported from Graph::Layouter::Spring in
+ *    http://search.cpan.org/~pasky/Graph-Layderer-0.02/
+ *  The algorithm is based on a spring-style layouter of a Java-based social
+ *  network tracker PieSpy written by Paul Mutton E<lt>paul@jibble.orgE<gt>.
+ *
+ *  Adopted by Philipp Strathausen <strathausen@gmail.com> to support Raphael JS
+ *  for rendering, dragging and much more. See http://blog.ameisenbar.de
+ *
+ *  Graph is freely distributable under the terms of an MIT-style license.
+ *  For details, see the Graph web site: http://dev.buildpatternd.com/trac
+ *
+ *  Links:
+ *
+ *  Demo of the original applet:
+ *      http://redsquirrel.com/dave/work/webdep/
+ *
+ *  Mirrored original source code at snipplr:
+ *      http://snipplr.com/view/1950/graph-javascript-framework-version-001/
+ *
+ *  Original usage example:
+ *      http://ajaxian.com/archives/new-javascriptcanvas-graph-library
+ *
+/*--------------------------------------------------------------------------*/
+
+/*
+ * Graph
+ */
+var Graph = function() {
+    this.nodes = [];
+    this.edges = [];
+};
+Graph.prototype = {
+    addNode: function(id, content) {
+        /* testing if node is already existing in the graph */
+        var new_node = this.nodes[id];
+        if(new_node == undefined) {
+                new_node = new Graph.Node(id, content||{"id":id});
+                this.nodes[id] = new_node;
+                this.nodes.push(new_node); // TODO get rid of the array
+        }
+        return new_node;
+    },
+
+    addEdge: function(source, target, style) {
+        var s = this.addNode(source);
+        var t = this.addNode(target);
+        var color;
+        var colorbg;
+        var directed;
+        if(style) { color = style.color; colorbg = style.colorbg; directed = style.directed }
+        var edge = { source: s, target: t, color: color, colorbg: colorbg, directed: directed };
+        this.edges.push(edge);
+    }
+};
+
+/*
+ * Node
+ */
+Graph.Node = function(id, value){
+    this.id = id;
+    this.content = value;
+};
+Graph.Node.prototype = {
+};
+Graph.Renderer = {};
+Graph.Renderer.Raphael = function(element, graph, width, height) {
+    this.width = width||400;
+    this.height = height||400;
+    var selfRef = this;
+    this.r = Raphael(element, this.width, this.height);
+    this.radius = 40; /* max dimension of a node */
+    this.graph = graph;
+    this.mouse_in = false;
+    
+    /*
+     * Dragging
+     */
+    this.isDrag = false;
+    this.dragger = function (e) {
+        this.dx = e.clientX;
+        this.dy = e.clientY;
+        selfRef.isDrag = this;
+        this.animate({"fill-opacity": .2}, 500);
+        e.preventDefault && e.preventDefault();
+    };
+
+    document.onmousemove = function (e) {
+        e = e || window.event;
+        if (selfRef.isDrag) {
+            var newX = e.clientX - selfRef.isDrag.dx + (selfRef.isDrag.attrs.cx == null ? (selfRef.isDrag.attrs.x + selfRef.isDrag.attrs.width / 2) : selfRef.isDrag.attrs.cx);
+            var newY = e.clientY - selfRef.isDrag.dy + (selfRef.isDrag.attrs.cy == null ? (selfRef.isDrag.attrs.y + selfRef.isDrag.attrs.height / 2) : selfRef.isDrag.attrs.cy);
+            /* prevent shapes from being dragged out of the canvas */
+            var clientX = e.clientX - (newX < 20 ? newX - 20 : newX > selfRef.width - 20 ? newX - selfRef.width + 20 : 0);
+            var clientY = e.clientY - (newY < 20 ? newY - 20 : newY > selfRef.height - 20 ? newY - selfRef.height + 20 : 0);
+            selfRef.isDrag.translate(clientX - selfRef.isDrag.dx, clientY - selfRef.isDrag.dy);
+            selfRef.isDrag.label.translate(clientX - selfRef.isDrag.dx, clientY - selfRef.isDrag.dy);
+            for (var i in selfRef.graph.edges) {
+                selfRef.graph.edges[i].connection.draw();
+            }
+            //selfRef.r.safari();
+            selfRef.isDrag.dx = clientX;
+            selfRef.isDrag.dy = clientY;
+        }
+    };
+    document.onmouseup = function () {
+        selfRef.isDrag && selfRef.isDrag.animate({"fill-opacity": 0}, 500);
+        selfRef.isDrag = false;
+    };
+};
+
+/*
+ * Renderer using RaphaelJS
+ */
+Graph.Renderer.Raphael.prototype = {
+    translate: function(point) {
+        return [
+            (point[0] - this.graph.layoutMinX) * this.factorX + this.radius,
+            (point[1] - this.graph.layoutMinY) * this.factorY + this.radius
+        ];
+    },
+
+    rotate: function(point, length, angle) {
+        var dx = length * Math.cos(angle);
+        var dy = length * Math.sin(angle);
+        return [point[0]+dx, point[1]+dy];
+    },
+
+    draw: function() {
+        this.factorX = (width - 2 * this.radius) / (this.graph.layoutMaxX - this.graph.layoutMinX);
+        this.factorY = (height - 2 * this.radius) / (this.graph.layoutMaxY - this.graph.layoutMinY);
+        for (var i = 0; i < this.graph.nodes.length; i++) {
+            this.drawNode(this.graph.nodes[i]);
+        }
+        for (var i = 0; i < this.graph.edges.length; i++) {
+            this.drawEdge(this.graph.edges[i]);
+        }
+    },
+    drawNode: function(node) {
+        var point = this.translate([node.layoutPosX, node.layoutPosY]);
+        node.point = point;
+        
+        /* if node has already been drawn, move the nodes */
+        if(node.shape) {
+//            console.log(node.shape.attrs );
+            var opoint = [ node.shape.attrs.cx || node.shape.attrs.x + node.shape.attrs.width / 2 , node.shape.attrs.cy || node.shape.attrs.y + node.shape.attrs.height / 2 + 15 ];
+            node.shape.translate(point[0]-opoint[0], point[1]-opoint[1]);
+            node.shape.label.translate(point[0]-opoint[0], point[1]-opoint[1]);
+            this.r.safari();
+            return;
+        }
+        var shape;
+        if(node.content.getShape) {
+            shape = node.content.getShape(this.r, point[0], point[1]);
+            shape.attr({"fill-opacity": 0});
+        } else {
+            shape = this.r.ellipse(point[0], point[1], 30, 20);
+            var color = Raphael.getColor();
+            shape.attr({fill: color, stroke: color, "fill-opacity": 0, "stroke-width": 2})
+        }
+        shape.mousedown(this.dragger);
+        shape.node.style.cursor = "move";
+        shape.label = this.r.text(point[0], point[1] + 30, node.content.label || node.id); // Beware: operator || also considers values like -1, 0, ...
+        node.shape = shape;
+    },
+    drawEdge: function(edge) {
+        /* if edge already has been drawn, only refresh the edge */
+        edge.connection && edge.connection.draw();
+        if(!edge.connection)
+            edge.connection = this.r.connection(edge.source.shape, edge.target.shape, { fg: edge.color, bg: edge.colorbg, directed: edge.directed });
+    }
+};
+Graph.Layout = {};
+Graph.Layout.Spring = function(graph) {
+                this.graph = graph;
+                this.iterations = 500;
+                this.maxRepulsiveForceDistance = 6;
+                this.k = 2;
+                this.c = 0.01;
+                this.maxVertexMovement = 0.5;
+        };
+Graph.Layout.Spring.prototype = {
+        layout: function() {
+                this.layoutPrepare();
+            for (var i = 0; i < this.iterations; i++) {
+                        this.layoutIteration();
+                }
+                this.layoutCalcBounds();
+        },
+       
+        layoutPrepare: function() {
+            for (var i = 0; i < this.graph.nodes.length; i++) {
+                    var node = this.graph.nodes[i];
+                        node.layoutPosX = 0;
+                        node.layoutPosY = 0;
+                        node.layoutForceX = 0;
+                        node.layoutForceY = 0;
+                }
+                
+        },
+       
+        layoutCalcBounds: function() {
+                var minx = Infinity, maxx = -Infinity, miny = Infinity, maxy = -Infinity;
+
+            for (var i = 0; i < this.graph.nodes.length; i++) {
+                        var x = this.graph.nodes[i].layoutPosX;
+                        var y = this.graph.nodes[i].layoutPosY;
+                                               
+                        if(x > maxx) maxx = x;
+                        if(x < minx) minx = x;
+                        if(y > maxy) maxy = y;
+                        if(y < miny) miny = y;
+                }
+
+                this.graph.layoutMinX = minx;
+                this.graph.layoutMaxX = maxx;
+                this.graph.layoutMinY = miny;
+                this.graph.layoutMaxY = maxy;
+        },
+       
+        layoutIteration: function() {
+                // Forces on nodes due to node-node repulsions
+            for (var i = 0; i < this.graph.nodes.length; i++) {
+                    var node1 = this.graph.nodes[i];
+                    for (var j = i + 1; j < this.graph.nodes.length; j++) {
+                            var node2 = this.graph.nodes[j];
+                                this.layoutRepulsive(node1, node2);
+                        }
+                }
+                // Forces on nodes due to edge attractions
+            for (var i = 0; i < this.graph.edges.length; i++) {
+                    var edge = this.graph.edges[i];
+                        this.layoutAttractive(edge);             
+                }
+               
+                // Move by the given force
+            for (var i = 0; i < this.graph.nodes.length; i++) {
+                    var node = this.graph.nodes[i];
+                        var xmove = this.c * node.layoutForceX;
+                        var ymove = this.c * node.layoutForceY;
+
+                        var max = this.maxVertexMovement;
+                        if(xmove > max) xmove = max;
+                        if(xmove < -max) xmove = -max;
+                        if(ymove > max) ymove = max;
+                        if(ymove < -max) ymove = -max;
+                       
+                        node.layoutPosX += xmove;
+                        node.layoutPosY += ymove;
+                        node.layoutForceX = 0;
+                        node.layoutForceY = 0;
+                }
+        },
+
+        layoutRepulsive: function(node1, node2) {
+                var dx = node2.layoutPosX - node1.layoutPosX;
+                var dy = node2.layoutPosY - node1.layoutPosY;
+                var d2 = dx * dx + dy * dy;
+                if(d2 < 0.01) {
+                        dx = 0.1 * Math.random() + 0.1;
+                        dy = 0.1 * Math.random() + 0.1;
+                        var d2 = dx * dx + dy * dy;
+                }
+                var d = Math.sqrt(d2);
+                if(d < this.maxRepulsiveForceDistance) {
+                        var repulsiveForce = this.k * this.k / d;
+                        node2.layoutForceX += repulsiveForce * dx / d;
+                        node2.layoutForceY += repulsiveForce * dy / d;
+                        node1.layoutForceX -= repulsiveForce * dx / d;
+                        node1.layoutForceY -= repulsiveForce * dy / d;
+                }
+        },
+
+        layoutAttractive: function(edge) {
+                var node1 = edge.source;
+                var node2 = edge.target;
+               
+                var dx = node2.layoutPosX - node1.layoutPosX;
+                var dy = node2.layoutPosY - node1.layoutPosY;
+                var d2 = dx * dx + dy * dy;
+                if(d2 < 0.01) {
+                        dx = 0.1 * Math.random() + 0.1;
+                        dy = 0.1 * Math.random() + 0.1;
+                        var d2 = dx * dx + dy * dy;
+                }
+                var d = Math.sqrt(d2);
+                if(d > this.maxRepulsiveForceDistance) {
+                        d = this.maxRepulsiveForceDistance;
+                        d2 = d * d;
+                }
+                var attractiveForce = (d2 - this.k * this.k) / this.k;
+                if(edge.weight == undefined || edge.weight < 1) edge.weight = 1;
+                attractiveForce *= Math.log(edge.weight) * 0.5 + 1;
+               
+                node2.layoutForceX -= attractiveForce * dx / d;
+                node2.layoutForceY -= attractiveForce * dy / d;
+                node1.layoutForceX += attractiveForce * dx / d;
+                node1.layoutForceY += attractiveForce * dy / d;
+        }
+};
diff --git a/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/jquery.js b/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/jquery.js
new file mode 100755
index 0000000..396646c
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/jquery.js
@@ -0,0 +1,19 @@
+/*
+ * jQuery JavaScript Library v1.3
+ * http://jquery.com/
+ *
+ * Copyright (c) 2009 John Resig
+ * Dual licensed under the MIT and GPL licenses.
+ * http://docs.jquery.com/License
+ *
+ * Date: 2009-01-13 12:50:31 -0500 (Tue, 13 Jan 2009)
+ * Revision: 6104
+ */
+(function(){var l=this,g,x=l.jQuery,o=l.$,n=l.jQuery=l.$=function(D,E){return new n.fn.init(D,E)},C=/^[^<]*(<(.|\s)+>)[^>]*$|^#([\w-]+)$/,f=/^.[^:#\[\.,]*$/;n.fn=n.prototype={init:function(D,G){D=D||document;if(D.nodeType){this[0]=D;this.length=1;this.context=D;return this}if(typeof D==="string"){var F=C.exec(D);if(F&&(F[1]||!G)){if(F[1]){D=n.clean([F[1]],G)}else{var H=document.getElementById(F[3]);if(H){if(H.id!=F[3]){return n().find(D)}var E=n(H);E.context=document;E.selector=D;return E}D=[]}}else{return n(G).find(D)}}else{if(n.isFunction(D)){return n(document).ready(D)}}if(D.selector&&D.context){this.selector=D.selector;this.context=D.context}return this.setArray(n.makeArray(D))},selector:"",jquery:"1.3",size:function(){return this.length},get:function(D){return D===g?n.makeArray(this):this[D]},pushStack:function(E,G,D){var F=n(E);F.prevObject=this;F.context=this.context;if(G==="find"){F.selector=this.selector+(this.selector?" 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diff --git a/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/raphael-min.js b/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/raphael-min.js
new file mode 100644
index 0000000..8718b5b
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/resources/html/js/raphael-min.js
@@ -0,0 +1,7 @@
+/*
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+ */
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diff --git a/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/ServiceDiagnostics.scala b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/ServiceDiagnostics.scala
new file mode 100644
index 0000000..406c5c0
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/ServiceDiagnostics.scala
@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.felix.servicediagnostics
+
+/**
+ * This is the main ServiceDiagnostics interface.
+ *
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+trait ServiceDiagnostics 
+{
+    /**
+     * returns a map of component name to list of leaf unresolved dependencies.
+     */
+    def notavail:Map[String, List[Dependency]]
+
+    /**
+     * returns a map of resolved service names to list of bundles using the service
+     */
+    def allServices:Map[String, List[String]]
+}
diff --git a/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/ServiceDiagnosticsPlugin.scala b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/ServiceDiagnosticsPlugin.scala
new file mode 100644
index 0000000..41b2444
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/ServiceDiagnosticsPlugin.scala
@@ -0,0 +1,46 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.felix.servicediagnostics
+
+/**
+ * This is the interface to be implemented by participating service injection frameworks
+ * such as SCR or DependencyManager. 
+ * Each plugin implementation is responsible for returning its own set of leaf unresolved dependencies.
+ *
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+trait ServiceDiagnosticsPlugin 
+{
+    /** 
+     * returns a map of unresolved service name -&gt; list of missing deps 
+     * leafs only: should not include intermediates
+     * @return the unresolved service names
+     */
+    def getUnresolvedDependencies:Map[String, List[Dependency]] 
+}
+
+/**
+ * This class represents a service dependency.
+ * @param name the service name
+ * @param filter the optional service filter
+ */
+class Dependency(val name:String, val filter:String) 
+{
+    override def toString = name//+"("+filter+")" FIXME
+}
diff --git a/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/Activator.scala b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/Activator.scala
new file mode 100644
index 0000000..786d93b
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/Activator.scala
@@ -0,0 +1,86 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.felix.servicediagnostics.impl
+
+import scala.collection.mutable.Map
+import scala.collection.JavaConversions._
+
+import javax.servlet.http.HttpServlet
+
+import org.osgi.framework.BundleContext
+import org.osgi.service.http.HttpService
+
+import org.apache.felix.dm.DependencyActivatorBase
+import org.apache.felix.dm.DependencyManager
+
+import org.apache.felix.servicediagnostics._
+import org.apache.felix.servicediagnostics.webconsole.Servlet
+import org.apache.felix.servicediagnostics.webconsole.WebConsolePlugin
+
+/**
+ * Activator class for the service diagnostics core implementation
+ *
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+class Activator extends DependencyActivatorBase
+{
+    override def init(bc:BundleContext, dm:DependencyManager) =
+    {
+        // register our diagnostics service and its plugins
+        dm.add(createComponent
+            .setInterface(classOf[ServiceDiagnosticsPlugin].getName, null)
+            .setImplementation(new DMNotAvail(bc)))
+
+        dm.add(createComponent
+            .setInterface(classOf[ServiceDiagnosticsPlugin].getName, null)
+            .setImplementation(classOf[DSNotAvail])
+            .add(createServiceDependency
+                .setService(classOf[org.apache.felix.scr.ScrService])
+                .setAutoConfig("scrService")
+                setRequired(true)))
+
+        dm.add(createComponent
+            .setInterface(classOf[ServiceDiagnostics].getName, null)
+            .setImplementation(new ServiceDiagnosticsImpl(bc))
+            .add(createServiceDependency
+                .setService(classOf[ServiceDiagnosticsPlugin])
+                .setCallbacks("addPlugin", null, null)
+                .setRequired(false)))
+
+        // register the servlet used by webconsole plugin
+        dm.add(createComponent
+            .setInterface(classOf[HttpServlet].getName, null)
+            .setImplementation(classOf[Servlet])
+            .add(createServiceDependency
+                .setService(classOf[ServiceDiagnostics])
+                .setRequired(true)
+                .setAutoConfig("engine"))
+            .add(createServiceDependency
+                .setService(classOf[HttpService])
+                .setRequired(true)
+                .setCallbacks("setHttpService", null, null)))
+
+        // and the webconsole plugin itself
+        dm.add(createComponent
+            .setInterface(classOf[javax.servlet.Servlet].getName, Map("felix.webconsole.label" -> "servicegraph"))
+            .setImplementation(classOf[WebConsolePlugin]))
+    }
+
+    override def destroy(bc:BundleContext, dm:DependencyManager) = {}
+}
diff --git a/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/DMNotAvail.scala b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/DMNotAvail.scala
new file mode 100644
index 0000000..cccb04a
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/DMNotAvail.scala
@@ -0,0 +1,80 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.felix.servicediagnostics.impl
+
+// this import of implicit methods makes java to scala collections conversions transparent (lists, maps)
+import scala.collection.JavaConversions._
+
+import org.osgi.framework.BundleContext
+import org.osgi.framework.ServiceReference
+
+import org.apache.felix.dm.DependencyManager
+import org.apache.felix.dm.ComponentDeclaration
+import org.apache.felix.dm.ComponentDeclaration._
+import org.apache.felix.dm.ComponentDependencyDeclaration
+import org.apache.felix.dm.ComponentDependencyDeclaration._
+
+import org.apache.felix.servicediagnostics._
+
+/**
+ * This class is the ServiceDiagnosticsPlugin implementation for org.apache.felix.dm.DependencyManager.
+ *
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+class DMNotAvail(val bc:BundleContext) extends ServiceDiagnosticsPlugin 
+{
+
+    /**
+     * implements ServiceDiagnosticsPlugin.getUnresolvedDependencies
+     */
+    override def getUnresolvedDependencies:Map[String, List[Dependency]] = 
+    {
+        // build a map(name -> comp) of all ComponentDeclarations known to DM, from each DependencyManager instance
+        val comps:Map[String, ComponentDeclaration] = 
+        {
+            (for(dm <- DependencyManager.getDependencyManagers;
+                comp <- dm.asInstanceOf[DependencyManager].getComponents; 
+                cd = comp.asInstanceOf[ComponentDeclaration]) 
+                // yield (k,v) builds a list of (k,v) pairs, the resulting list is then turned into a map
+                // notice that toMap applies to the complete for-comprehension block
+                // k is the ComponentDeclaration name stripped of its filter part: everything before the '('
+                yield (cd.getName.takeWhile(_ != '('), cd)) toMap
+        }
+
+        val compNames = comps.keySet
+
+        // build and return a map(name -> List(unavail)) of unavailable dependencies:
+        // filter out registered services from the known ComponentDeclarations
+        (for(kv <- comps.filter(kv => kv._2.getState == STATE_UNREGISTERED);
+            // kv._1 is the name, kv._2 is the component
+            // here, we lookup the component's list of dependencies
+            // filtering out the ones available and the ones already known to DM, to keep only leafs
+            // (view/force added for performance)
+            unavail = kv._2.getComponentDependencies.view
+                .filter(dep => dep.getState == STATE_UNAVAILABLE_REQUIRED)
+                .filterNot(dep => compNames.contains(dep.getName))
+                .map(dep => new Dependency(dep.getName, ""/*dep.getFilter*/)).force.toList;
+            if (unavail nonEmpty)) //this 'if' is part of the for comprehension
+            // again yield (k,v) builds a list of (k,v), the final result is then turned into a map
+            // notice that toMap applies to the complete for-comprehension block
+            // toMap being the last instruction, the resulting map is the return value of the method
+            yield (kv._1, unavail)) toMap
+    }
+
+}
diff --git a/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/DSNotAvail.scala b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/DSNotAvail.scala
new file mode 100644
index 0000000..80101ed
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/DSNotAvail.scala
@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.felix.servicediagnostics.impl
+
+import scala.collection.JavaConversions._
+
+import org.apache.felix.scr.Component
+import org.apache.felix.scr.Reference
+import org.apache.felix.scr.ScrService
+
+import org.apache.felix.servicediagnostics._
+
+/**
+ * This class is the ServiceDiagnosticsPlugin implementation for org.apache.felix.scr.
+ *
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+class DSNotAvail extends ServiceDiagnosticsPlugin 
+{
+
+    var scrService:ScrService = _ //dependency injection
+
+    /**
+     * implements ServiceDiagnosticsPlugin.getUnresolvedDependencies.
+     */
+    override def getUnresolvedDependencies:Map[String, List[Dependency]] = 
+    {
+        /*
+         * Same algorithm as DMNotAvail with the SCR API. 
+         * Please refer to DMNotAvail for comments.
+         */
+        val comps:Map[String, Component] = 
+            (for (c <- Option(scrService.getComponents).flatten;
+            s <- Option(c.getServices).flatten)
+        yield (s, c)).toMap
+
+        val compNames = comps.keySet
+
+        (for (kv <- comps.filter(kv => kv._2.getState == Component.STATE_UNSATISFIED);
+            unavail = kv._2.getReferences.view
+                .filterNot(_ isSatisfied)
+                .filterNot(_ isOptional)
+                .filterNot(ref => compNames.contains(ref.getName))
+                .map(ref => new Dependency(ref.getServiceName, ref.getTarget)).force.toList;
+            if (unavail nonEmpty))
+            yield (kv._1, unavail)).toMap
+    }
+}
+
diff --git a/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/ServiceDiagnosticsImpl.scala b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/ServiceDiagnosticsImpl.scala
new file mode 100644
index 0000000..e4073af
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/impl/ServiceDiagnosticsImpl.scala
@@ -0,0 +1,92 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.felix.servicediagnostics.impl
+
+import scala.collection.mutable.Buffer
+
+import org.osgi.framework.BundleContext
+import org.osgi.framework.ServiceReference
+import org.osgi.framework.Constants.OBJECTCLASS
+
+import org.apache.felix.servicediagnostics._
+
+/**
+ * This is the ServiceDiagnostics implementation. 
+ *
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+class ServiceDiagnosticsImpl(val bc:BundleContext) extends ServiceDiagnostics 
+{
+    val plugins:Buffer[ServiceDiagnosticsPlugin] = Buffer()
+
+    def addPlugin(p:ServiceDiagnosticsPlugin) = plugins += p
+
+    /**
+     * Implements ServiceDiagnostics.notavail.
+     * 
+     * This method gathers "notavail" information from all plugins
+     * and performs the final merge by removing known unregistered services
+     */
+    override def notavail = 
+    {
+        // merge all notavails from plugins 
+        // (kv stands for each key/value pair in a map)
+        val merged = (for(p <- plugins; kv <- p.getUnresolvedDependencies) yield kv) toMap
+
+        // remove remaining intermediates. ex: unresolved in DS -> unavailable in DM
+        // and return the resulting map
+        (for(kv <- merged; dep <- kv._2; if (merged.get(dep.name) isEmpty)) yield kv) toMap
+    }
+
+    /**
+    * Implements ServiceDiagnostics.allServices.
+    */
+    override def allServices:Map[String,List[String]] = 
+    {
+        val allrefs = bc.getAllServiceReferences(null, null)
+        if (allrefs == null) return Map()
+
+        /*
+         * inner method used to return all the interface names a ServiceReference was registered under
+         */
+        def names(ref:ServiceReference):Array[String] = 
+        {
+            val n = ref.getProperty(OBJECTCLASS)
+            if (n != null) n.asInstanceOf[Array[String]] else Array()
+        }
+
+        /*
+         * inner method used to return all the bundles using a given ServiceReference
+         */
+        def using(ref:ServiceReference):List[String] = 
+        {
+            val u = ref.getUsingBundles
+            if (u != null) u.toList.map(_ toString) else List()
+        }
+
+        //scan all service references to build a map of service name to list of using bundles
+        (for(ref <- bc.getAllServiceReferences(null, null);
+            name <- names(ref);
+            u = using(ref);
+            if (u.nonEmpty))
+            // yield (key,value) accumulates a list of (key,value) pairs
+            // the resulting list is transformed to a map and returned
+            yield (name, u)) toMap
+    }
+}
diff --git a/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/webconsole/Servlet.scala b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/webconsole/Servlet.scala
new file mode 100644
index 0000000..c26a3d7
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/webconsole/Servlet.scala
@@ -0,0 +1,72 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.felix.servicediagnostics.webconsole
+
+import scala.collection.JavaConversions._
+import scala.collection.mutable.{Map => mMap}
+
+import java.io.PrintStream
+import javax.servlet.http._
+
+import org.json.JSONObject
+
+import org.osgi.service.http.HttpContext
+import org.osgi.service.http.HttpService
+
+import org.apache.felix.servicediagnostics.ServiceDiagnostics
+
+/**
+ * This is the servlet responding to the ajax requests, using the ServiceDiagnostics service
+ *
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+class Servlet extends HttpServlet 
+{
+
+    var engine:ServiceDiagnostics = _ //dependency injection. see Activator.
+
+    /*
+    * dependency injection. see Activator.
+    * registers this servlet into the HttpService
+    */
+    def setHttpService(hs:HttpService) = 
+    {
+        val hc = hs.createDefaultHttpContext
+        hs.registerServlet("/servicegraph/json", this, null, hc)
+        hs.registerResources("/servicegraph", "/html", hc)
+    }
+
+    override def service(req:HttpServletRequest, resp:HttpServletResponse) = 
+    {
+        val cmd = req.getPathInfo
+        if(cmd.endsWith("all")) reply(resp, engine.allServices)
+        else if(cmd.endsWith("notavail")) reply(resp, engine.notavail)
+        else println("Unrecognized cmd: "+cmd)
+    }
+
+    /** 
+    * turn the ServiceDiagnostics output into a JSON representation.
+    */
+    private def reply(resp:HttpServletResponse, map:Map[String,List[AnyRef]]) = 
+    {
+        new PrintStream(resp.getOutputStream, true).println(
+            new JSONObject(asJavaMap(mMap() ++ map.map(kv => (kv._1, asJavaList(kv._2))))))
+    }
+}
+
diff --git a/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/webconsole/WebConsolePlugin.scala b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/webconsole/WebConsolePlugin.scala
new file mode 100644
index 0000000..b3042fe
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/core/src/main/scala/servicediagnostics/webconsole/WebConsolePlugin.scala
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.felix.servicediagnostics.webconsole
+
+import javax.servlet.http._
+
+import org.apache.felix.webconsole.SimpleWebConsolePlugin
+
+/**
+ * This is the Apache Felix WebConsolePlugin implementation.
+ * It simply returns a static html page; actual processing is done by an ajax request to the servlet.
+ *
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+class WebConsolePlugin extends SimpleWebConsolePlugin("servicegraph", "Service Graph", Array[String]()) 
+{
+    val TEMPLATE = readTemplateFile("/html/index.html")
+
+    override def renderContent(req:HttpServletRequest, resp:HttpServletResponse) = resp.getWriter().print( TEMPLATE )
+}
diff --git a/webconsole-plugins/servicediagnostics/pom.xml b/webconsole-plugins/servicediagnostics/pom.xml
new file mode 100644
index 0000000..c329222
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/pom.xml
@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>org.apache.felix</groupId>
+  <artifactId>servicediagnostics</artifactId>
+  <version>1.0.0-SNAPSHOT</version>
+  <packaging>pom</packaging>
+
+  <modules>
+    <module>core</module>
+    <module>sample</module>
+  </modules>
+
+
+  <repositories>
+    <repository>
+      <id>scala-tools.org</id>
+      <name>Scala-tools Maven2 Repository</name>
+      <url>http://scala-tools.org/repo-releases</url>
+    </repository>
+  </repositories>
+  
+  <pluginRepositories>
+    <pluginRepository>
+      <id>scala-tools.org</id>
+      <name>Scala-tools Maven2 Repository</name>
+      <url>http://scala-tools.org/repo-releases</url>
+    </pluginRepository>
+  </pluginRepositories>
+  
+  <dependencies>
+    <dependency>
+      <groupId>org.osgi</groupId>
+      <artifactId>org.osgi.core</artifactId>
+      <version>4.2.0</version>
+    </dependency>
+    <dependency>
+      <groupId>org.osgi</groupId>
+      <artifactId>org.osgi.compendium</artifactId>
+      <version>4.2.0</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.felix</groupId>
+      <artifactId>org.apache.felix.scr</artifactId>
+      <version>1.6.0</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.felix</groupId>
+      <artifactId>org.apache.felix.dependencymanager</artifactId>
+      <version>3.0.0</version>
+    </dependency>
+    <dependency>
+      <groupId>biz.aQute</groupId>
+      <artifactId>bndlib</artifactId>
+      <version>1.43.0</version>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <sourceDirectory>src/main/scala</sourceDirectory>
+    <testSourceDirectory>src/test/scala</testSourceDirectory>
+    
+    <plugins>
+      <plugin>
+        <groupId>org.scala-tools</groupId>
+        <artifactId>maven-scala-plugin</artifactId>
+        <executions>
+          <execution>
+            <goals>
+              <goal>compile</goal>
+            </goals>
+          </execution>
+        </executions>
+				<configuration>
+					<scalaVersion>2.8.1</scalaVersion>
+				</configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.felix</groupId>
+        <artifactId>maven-bundle-plugin</artifactId>
+        <version>2.3.5</version>
+        <extensions>true</extensions>
+      </plugin>
+    </plugins>
+  </build>
+  
+</project>
diff --git a/webconsole-plugins/servicediagnostics/run.sh b/webconsole-plugins/servicediagnostics/run.sh
new file mode 100755
index 0000000..8cdb368
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/run.sh
@@ -0,0 +1,16 @@
+REPO=$HOME/.m2/repository
+CLASSPATH=lib/scala-library-osgi.jar:$REPO/org/apache/felix/org.apache.felix.main/3.2.2/org.apache.felix.main-3.2.2.jar:sample/target/servicediagnostics.sample-1.0.0-SNAPSHOT.jar
+#scala 
+java -classpath $CLASSPATH org.apache.felix.servicediagnostics.sample.FelixLauncher \
+  core/target/servicediagnostics.core-1.0.0-SNAPSHOT.jar\
+  sample/target/servicediagnostics.sample-1.0.0-SNAPSHOT.jar\
+  $REPO/org/apache/felix/org.apache.felix.main/3.2.2/org.apache.felix.main-3.2.2.jar\
+  $REPO/org/apache/felix/org.apache.felix.dependencymanager/3.0.0/org.apache.felix.dependencymanager-3.0.0.jar\
+  $REPO/org/apache/felix/org.apache.felix.scr/1.6.0/org.apache.felix.scr-1.6.0.jar\
+  $REPO/org/osgi/org.osgi.compendium/4.2.0/org.osgi.compendium-4.2.0.jar\
+  $REPO/org/apache/felix/org.apache.felix.http.jetty/2.2.0/org.apache.felix.http.jetty-2.2.0.jar\
+  $REPO/org/apache/felix/org.apache.felix.webconsole/3.1.8/org.apache.felix.webconsole-3.1.8.jar\
+  $REPO/org/apache/felix/org.apache.felix.shell/1.4.2/org.apache.felix.shell-1.4.2.jar\
+  lib/json-osgi.jar\
+  lib/scala-library-osgi.jar
+ 
diff --git a/webconsole-plugins/servicediagnostics/sample/pom.xml b/webconsole-plugins/servicediagnostics/sample/pom.xml
new file mode 100644
index 0000000..039c294
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/sample/pom.xml
@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  
+  <modelVersion>4.0.0</modelVersion>
+  <parent>
+    <groupId>org.apache.felix</groupId>
+    <artifactId>servicediagnostics</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <relativePath>../pom.xml</relativePath>
+  </parent>
+
+  <groupId>org.apache.felix</groupId>
+  <artifactId>servicediagnostics.sample</artifactId>
+  <version>1.0.0-SNAPSHOT</version>
+  <packaging>bundle</packaging>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.apache.felix</groupId>
+      <artifactId>servicediagnostics.core</artifactId>
+      <version>1.0.0-SNAPSHOT</version>
+    </dependency>
+    <!-- runtime dependencies. added to populate the local repository -->
+    <dependency>
+      <groupId>org.apache.felix</groupId>
+      <artifactId>org.apache.felix.main</artifactId>
+      <version>3.2.2</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.felix</groupId>
+      <artifactId>org.apache.felix.http.jetty</artifactId>
+      <version>2.2.0</version>
+    </dependency>
+    <dependency>
+      <groupId>org.apache.felix</groupId>
+      <artifactId>org.apache.felix.shell</artifactId>
+      <version>1.4.2</version>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.scala-tools</groupId>
+        <artifactId>maven-scala-plugin</artifactId>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.felix</groupId>
+        <artifactId>maven-bundle-plugin</artifactId>
+        <configuration>
+          <instructions>
+            <Bundle-Category>osgi</Bundle-Category>
+            <Bundle-SymbolicName>
+              ${project.artifactId}
+            </Bundle-SymbolicName>
+            <Service-Component>
+              *
+            </Service-Component>
+            <Private-Package>
+              org.apache.felix.servicediagnostics.sample
+            </Private-Package>
+            <Import-Package>
+              !aQute.bnd.annotation.component,!org.apache.felix.main,*
+            </Import-Package>
+          </instructions>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+  
+</project>
diff --git a/webconsole-plugins/servicediagnostics/sample/src/main/scala/servicediagnostics/sample/FelixLauncher.scala b/webconsole-plugins/servicediagnostics/sample/src/main/scala/servicediagnostics/sample/FelixLauncher.scala
new file mode 100644
index 0000000..51c03e3
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/sample/src/main/scala/servicediagnostics/sample/FelixLauncher.scala
@@ -0,0 +1,59 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.felix.servicediagnostics.sample
+
+import java.util.HashMap
+import java.util.ServiceLoader
+
+import scala.io.Source
+
+import org.osgi.framework.launch.FrameworkFactory
+import org.apache.felix.main.AutoProcessor
+
+/**
+ * This is a simple launcher for the framework, that doesn't require a properties file. 
+ * Bundles to be started are simply given in the command line.
+ *
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+object FelixLauncher
+{
+    def main(bundles:Array[String]) = 
+    {
+        // load the FrameworkFactory implementation
+        val factory:FrameworkFactory = ServiceLoader.load(classOf[FrameworkFactory],
+            getClass.getClassLoader).iterator.next
+        // set our hardcoded felix.properties
+        val felixProps = new HashMap[String, String]
+        felixProps.put("org.osgi.framework.storage", ".cache")
+        felixProps.put("org.osgi.framework.storage.clean", "onFirstInit")
+        felixProps.put("felix.auto.install", bundles.map("file:"+_).mkString(" "))
+        felixProps.put("felix.auto.start", bundles.map("file:"+_).mkString(" "))
+        felixProps.put("org.osgi.framework.bootdelegation", "sun.*,com.sun.*")
+
+        //println("Launch Felix using "+factory+" and "+felixProps)
+        val felix = factory.newFramework(felixProps)
+        felix.init
+        // let the AutoProcessor process the properties (auto.install and auto.start)
+        AutoProcessor.process(felixProps, felix.getBundleContext)
+        // launch felix
+        felix.start
+        //println("Felix started")
+    }
+}
diff --git a/webconsole-plugins/servicediagnostics/sample/src/main/scala/servicediagnostics/sample/TestDM.scala b/webconsole-plugins/servicediagnostics/sample/src/main/scala/servicediagnostics/sample/TestDM.scala
new file mode 100644
index 0000000..d56b364
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/sample/src/main/scala/servicediagnostics/sample/TestDM.scala
@@ -0,0 +1,91 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.felix.servicediagnostics.sample
+
+import org.osgi.framework.BundleContext
+import org.apache.felix.dm.DependencyActivatorBase
+import org.apache.felix.dm.DependencyManager
+import org.apache.felix.servicediagnostics.ServiceDiagnostics
+
+/**
+ * This class is a basic DependencyManager based demonstration
+ *
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+class TestDM extends DependencyActivatorBase
+{
+    var diagnostics:ServiceDiagnostics = _ //injected
+
+    override def init(bc:BundleContext, dm:DependencyManager) 
+    {
+        // register a callback in this class to try the engine alone
+        // in text mode, when everything is started
+        dm.add(createComponent
+            .setImplementation(this)
+            .add(createServiceDependency
+                .setService(classOf[TestDS]) // also wait for DS initialization
+                .setAutoConfig(false)
+                .setRequired(true))
+            .add(createServiceDependency
+                .setService(classOf[ServiceDiagnostics])
+                .setAutoConfig("diagnostics")
+                .setRequired(true)))
+
+        // initialize some sample services for testing purpose (see also TestDS)
+        dm.add(createComponent
+            .setInterface(classOf[DM1].getName, null)
+            .setImplementation(classOf[DM1])
+            .add(createServiceDependency
+                .setService(classOf[DM2])
+                .setAutoConfig(false)
+                .setCallbacks(null, null, null)
+                .setRequired(true)))
+
+        dm.add(createComponent
+            .setInterface(classOf[DM2].getName, null)
+            .setImplementation(classOf[DM2])
+            .add(createServiceDependency
+                .setService(classOf[DM3])
+                .setAutoConfig(false)
+                .setCallbacks(null, null, null)
+                .setRequired(true)))
+
+        dm.add(createComponent
+            .setInterface(classOf[DM3].getName, null)
+            .setImplementation(classOf[DM3])
+            .add(createServiceDependency
+                .setService(classOf[Runnable]) //missing dependency
+                .setAutoConfig(false)
+                .setCallbacks(null, null, null)
+                .setRequired(true)))
+    }
+
+    override def destroy(bc:BundleContext, dm:DependencyManager) = {}
+
+    def start = 
+    {
+        println("unavail="+diagnostics.notavail)
+        println("all="+diagnostics.allServices)
+    }
+}
+
+//sample service classes
+class DM1
+class DM2
+class DM3
diff --git a/webconsole-plugins/servicediagnostics/sample/src/main/scala/servicediagnostics/sample/TestDS.scala b/webconsole-plugins/servicediagnostics/sample/src/main/scala/servicediagnostics/sample/TestDS.scala
new file mode 100644
index 0000000..57adf9b
--- /dev/null
+++ b/webconsole-plugins/servicediagnostics/sample/src/main/scala/servicediagnostics/sample/TestDS.scala
@@ -0,0 +1,43 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.felix.servicediagnostics.sample
+
+import aQute.bnd.annotation.component._
+
+/**
+ * This class is a basic SCR based demonstration
+ *
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+@Component(immediate=true, provide=Array(classOf[TestDS])) class TestDS 
+
+@Component(provide=Array(classOf[DS1])) class DS1 
+{
+    @Reference def setDS2(s:DS2) = {}
+}
+
+@Component(provide=Array(classOf[DS2])) class DS2 
+{
+    @Reference def setDM3(s:DM3) = {}
+}
+
+@Component(provide=Array(classOf[DS3])) class DS3 
+{
+    @Reference def setMap(s:java.util.Map[String,String]) = {} //not available
+}