CHANGE 1:
Patch to show API for Alarms in Fault Management.
AlarmsWebResource.java & Alarm.java show what the external REST API for alarms would look like.
See more info at https://wiki.onosproject.org/display/ONOS/Fault+Management
Everything else is very early and work-in-progress/mostly just stubbed out, and not ready for review but all advice welcome.

CHANGE 2:
[ONOS-3203] Update re. comments on FM API draft.
Comments were from Thomas Vachuska regarding https://gerrit.onosproject.org/#/c/6180/
Change-Id: If8d330d1b18b503e89849587e2d4388bf67becc0
diff --git a/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmCodecContext.java b/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmCodecContext.java
new file mode 100644
index 0000000..89886e8
--- /dev/null
+++ b/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmCodecContext.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed 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.onosproject.faultmanagement.web;
+
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.onosproject.codec.CodecContext;
+import org.onosproject.codec.JsonCodec;
+
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.onosproject.incubator.net.faultmanagement.alarm.Alarm;
+
+/**
+ * Mock codec context for use in codec unit tests.
+ */
+public class AlarmCodecContext implements CodecContext {
+
+    private final ObjectMapper mapper = new ObjectMapper();
+    private final Map<Class<?>, JsonCodec> codecs = new ConcurrentHashMap<>();
+
+    /**
+     * Constructs a new mock codec context.
+     */
+    public AlarmCodecContext() {
+        codecs.clear();
+        registerCodec(Alarm.class, new AlarmCodec());
+
+    }
+
+    @Override
+    public ObjectMapper mapper() {
+        return mapper;
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public <T> T getService(Class<T> serviceClass) {
+        // TODO
+        return null;
+    }
+
+    /**
+     * Registers the specified JSON codec for the given entity class.
+     *
+     * @param entityClass entity class
+     * @param codec       JSON codec
+     * @param <T>         entity type
+     */
+    public <T> void registerCodec(Class<T> entityClass, JsonCodec<T> codec) {
+        codecs.putIfAbsent(entityClass, codec);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public <T> JsonCodec<T> codec(Class<T> entityClass) {
+        return codecs.get(entityClass);
+    }
+}
diff --git a/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmCodecTest.java b/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmCodecTest.java
new file mode 100644
index 0000000..3009b99a
--- /dev/null
+++ b/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmCodecTest.java
@@ -0,0 +1,140 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed 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.onosproject.faultmanagement.web;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import java.io.IOException;
+import java.io.InputStream;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.notNullValue;
+import static org.hamcrest.Matchers.nullValue;
+
+import org.junit.Test;
+import org.onosproject.codec.JsonCodec;
+import static org.onosproject.faultmanagement.web.AlarmJsonMatcher.matchesAlarm;
+import org.onosproject.net.DeviceId;
+import org.onosproject.incubator.net.faultmanagement.alarm.Alarm;
+import org.onosproject.incubator.net.faultmanagement.alarm.AlarmEntityId;
+import org.onosproject.incubator.net.faultmanagement.alarm.AlarmId;
+import org.onosproject.incubator.net.faultmanagement.alarm.DefaultAlarm;
+
+public class AlarmCodecTest {
+
+    private final AlarmCodecContext context = new AlarmCodecContext();
+
+    // Use this to check handling for miminal Alarm
+    private final Alarm alarmMinimumFields = new DefaultAlarm.Builder(
+            new AlarmId(44),
+            DeviceId.deviceId("of:2222000000000000"),
+            "NE unreachable",
+            Alarm.SeverityLevel.CLEARED,
+            1).
+            build();
+
+    // Use this to check handling for fully populated Alarm
+    private final Alarm alarmWithSource = new DefaultAlarm.Builder(
+            new AlarmId(44),
+            DeviceId.deviceId("of:2222000000000000"),
+            "NE unreachable",
+            Alarm.SeverityLevel.CLEARED, 1).
+            forSource(AlarmEntityId.alarmEntityId("port:1/2/3/4")).
+            withTimeUpdated(2).
+            withTimeCleared(3L).
+            withServiceAffecting(true).
+            withAcknowledged(true).
+            withManuallyClearable(true).
+            withAssignedUser("the assigned user").build();
+
+    @Test
+    public void alarmCodecTestWithOptionalFieldMissing() {
+        //context.registerService(AlarmService.class, new AlarmServiceAdapter());
+        final JsonCodec<Alarm> codec = context.codec(Alarm.class);
+        assertThat(codec, is(notNullValue()));
+
+        final ObjectNode alarmJson = codec.encode(alarmMinimumFields, context);
+        assertThat(alarmJson, notNullValue());
+        assertThat(alarmJson, matchesAlarm(alarmMinimumFields));
+
+    }
+
+    @Test
+    public void alarmCodecTestWithOptionalField() {
+        final JsonCodec<Alarm> codec = context.codec(Alarm.class);
+        assertThat(codec, is(notNullValue()));
+
+        final ObjectNode alarmJson = codec.encode(alarmWithSource, context);
+        assertThat(alarmJson, notNullValue());
+        assertThat(alarmJson, matchesAlarm(alarmWithSource));
+
+    }
+
+    @Test
+    public void verifyMinimalAlarmIsEncoded() throws Exception {
+        final JsonCodec<Alarm> alarmCodec = context.codec(Alarm.class);
+
+        final Alarm alarm = getDecodedAlarm(alarmCodec, "alarm-minimal.json");
+        assertCommon(alarm);
+
+        assertThat(alarm.timeCleared(), nullValue());
+        assertThat(alarm.assignedUser(), nullValue());
+
+    }
+
+    @Test
+    public void verifyFullyLoadedAlarmIsEncoded() throws Exception {
+        final JsonCodec<Alarm> alarmCodec = context.codec(Alarm.class);
+
+        final Alarm alarm = getDecodedAlarm(alarmCodec, "alarm-full.json");
+        assertCommon(alarm);
+
+        assertThat(alarm.timeCleared(), is(2222L));
+        assertThat(alarm.assignedUser(), is("foo"));
+
+    }
+
+    private void assertCommon(final Alarm alarm) {
+        assertThat(alarm.id(), is(new AlarmId(10L)));
+        assertThat(alarm.description(), is("NE is not reachable"));
+        assertThat(alarm.source(), is(AlarmEntityId.NONE));
+        assertThat(alarm.timeRaised(), is(999L));
+        assertThat(alarm.timeUpdated(), is(1111L));
+        assertThat(alarm.severity(), is(Alarm.SeverityLevel.MAJOR));
+        assertThat(alarm.serviceAffecting(), is(true));
+        assertThat(alarm.acknowledged(), is(false));
+        assertThat(alarm.manuallyClearable(), is(true));
+    }
+
+    /**
+     * Reads in a rule from the given resource and decodes it.
+     *
+     * @param resourceName resource to use to read the JSON for the rule
+     * @return decoded flow rule
+     * @throws IOException if processing the resource failsdecode
+     */
+    private Alarm getDecodedAlarm(final JsonCodec<Alarm> codec, final String resourceName) throws IOException {
+        final InputStream jsonStream = AlarmCodecTest.class
+                .getResourceAsStream(resourceName);
+        final JsonNode json = context.mapper().readTree(jsonStream);
+        assertThat(json, notNullValue());
+        final Alarm result = codec.decode((ObjectNode) json, context);
+        assertThat(result, notNullValue());
+        return result;
+    }
+
+
+}
diff --git a/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmJsonMatcher.java b/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmJsonMatcher.java
new file mode 100644
index 0000000..14bb45f
--- /dev/null
+++ b/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmJsonMatcher.java
@@ -0,0 +1,135 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed 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.onosproject.faultmanagement.web;
+
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeDiagnosingMatcher;
+import org.onosproject.incubator.net.faultmanagement.alarm.Alarm;
+
+import com.fasterxml.jackson.databind.JsonNode;
+
+/**
+ * Hamcrest matcher for alarms.
+ */
+public final class AlarmJsonMatcher extends TypeSafeDiagnosingMatcher<JsonNode> {
+
+    private final Alarm alarm;
+
+    private AlarmJsonMatcher(final Alarm alarm) {
+        this.alarm = alarm;
+    }
+
+    @Override
+    public boolean matchesSafely(final JsonNode jsonAlarm, final Description description) {
+        final String jsonAlarmId = jsonAlarm.get("id").asText();
+        final String alarmId = Long.toString(alarm.id().fingerprint());
+        if (!jsonAlarmId.equals(alarmId)) {
+            description.appendText("alarm id was " + jsonAlarmId);
+            return false;
+        }
+
+        final String jsonDeviceId = jsonAlarm.get("deviceId").asText();
+        final String alarmDeviceId = alarm.deviceId().toString();
+        if (!jsonDeviceId.equals(alarmDeviceId)) {
+            description.appendText("DeviceId was " + jsonDeviceId);
+            return false;
+        }
+
+
+        final String jsonDescription = jsonAlarm.get("description").asText();
+        final String alarmDesc = alarm.description();
+        if (!jsonDescription.equals(alarmDesc)) {
+            description.appendText("description was " + jsonDescription);
+            return false;
+        }
+
+        final long jsonTimeRaised = jsonAlarm.get("timeRaised").asLong();
+        final long timeRaised = alarm.timeRaised();
+        if (timeRaised != jsonTimeRaised) {
+            description.appendText("timeRaised was " + jsonTimeRaised);
+            return false;
+        }
+
+
+        final long jsonTimeUpdated = jsonAlarm.get("timeUpdated").asLong();
+        final long timeUpdated = alarm.timeUpdated();
+        if (timeUpdated != jsonTimeUpdated) {
+            description.appendText("timeUpdated was " + jsonTimeUpdated);
+            return false;
+        }
+
+        final JsonNode jsonTimeClearedNode = jsonAlarm.get("timeCleared");
+
+        if (alarm.timeCleared() != null) {
+            final Long jsonTimeCleared = jsonTimeClearedNode.longValue();
+            final Long timeCleared = alarm.timeCleared();
+
+            if (!timeCleared.equals(jsonTimeCleared)) {
+                description.appendText("Time Cleared was " + jsonTimeCleared);
+                return false;
+            }
+        } else {
+            //  No clear time not specified, JSON representation must be empty
+            if (!jsonTimeClearedNode.isNull()) {
+                description.appendText("Time Cleared should be null");
+                return false;
+            }
+        }
+
+        final String jsonSeverity = jsonAlarm.get("severity").asText();
+        final String severity = alarm.severity().toString();
+        if (!severity.equals(jsonSeverity)) {
+            description.appendText("severity was " + jsonSeverity);
+            return false;
+        }
+
+        final JsonNode jsonAlarmNode = jsonAlarm.get("source");
+
+        if (alarm.source() != null) {
+            final String jsonSource = jsonAlarmNode.textValue();
+            final String source = alarm.source().toString();
+
+            if (!source.equals(jsonSource)) {
+                description.appendText("source was " + jsonSource);
+                return false;
+            }
+        } else {
+            //  source not specified, JSON representation must be empty
+            if (!jsonAlarmNode.isNull()) {
+                description.appendText("source should be null");
+                return false;
+            }
+        }
+
+        // In progress
+        return true;
+    }
+
+    @Override
+    public void describeTo(final Description description) {
+        description.appendText(alarm.toString());
+    }
+
+    /**
+     * Factory to allocate a alarm matcher.
+     *
+     * @param alarm alarm object we are looking for
+     * @return matcher
+     */
+    public static AlarmJsonMatcher matchesAlarm(final Alarm alarm) {
+        return new AlarmJsonMatcher(alarm);
+    }
+}
diff --git a/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmsWebResourceTest.java b/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmsWebResourceTest.java
new file mode 100644
index 0000000..0b7d981
--- /dev/null
+++ b/apps/faultmanagement/fmweb/src/test/java/org/onosproject/faultmanagement/web/AlarmsWebResourceTest.java
@@ -0,0 +1,72 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed 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.onosproject.faultmanagement.web;
+
+import com.sun.jersey.api.client.WebResource;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.not;
+import org.junit.Ignore;
+import org.onlab.osgi.ServiceDirectory;
+import org.onlab.osgi.TestServiceDirectory;
+import org.onlab.rest.BaseResource;
+import org.onosproject.codec.CodecService;
+import org.onosproject.codec.impl.CodecManager;
+import org.onosproject.rest.ResourceTest;
+
+/**
+ * Test of the Fault Management Web REST API for Alarms.
+ */
+public class AlarmsWebResourceTest extends ResourceTest {
+
+    @Before
+    public void setUp() {
+
+        final CodecManager codecService = new CodecManager();
+        codecService.activate();
+
+        final ServiceDirectory testDirectory
+                = new TestServiceDirectory()
+                // Currently no alarms-service implemented
+                // .add(AlarmsService.class, alarmsService)
+                .add(CodecService.class, codecService);
+        BaseResource.setServiceDirectory(testDirectory);
+    }
+
+    @Test
+    @Ignore
+    public void getAllAlarms() {
+        final WebResource rs = resource();
+        final String response = rs.path("/alarms").get(String.class);
+        // Ensure hard-coded alarms returned okay
+        assertThat(response, containsString("\"NE is not reachable\","));
+        assertThat(response, containsString("\"Equipment Missing\","));
+    }
+
+    @Test
+    @Ignore
+    public void getAlarm() {
+        final WebResource rs = resource();
+        final String response = rs.path("/alarms/1").get(String.class);
+        // Ensure hard-coded alarms returned okay
+        assertThat(response, containsString("\"NE is not reachable\","));
+        assertThat(response, not(containsString("\"Equipment Missing\",")));
+    }
+
+}