Sonar suggestions

Change-Id: I68d400185ffc885bf92b558a2565a49af149ef0c
diff --git a/apps/faultmanagement/fmcli/src/main/java/org/onosproject/faultmanagement/alarms/cli/completer/AlarmFieldValueCompleter.java b/apps/faultmanagement/fmcli/src/main/java/org/onosproject/faultmanagement/alarms/cli/completer/AlarmFieldValueCompleter.java
index b698d56..87b8282 100644
--- a/apps/faultmanagement/fmcli/src/main/java/org/onosproject/faultmanagement/alarms/cli/completer/AlarmFieldValueCompleter.java
+++ b/apps/faultmanagement/fmcli/src/main/java/org/onosproject/faultmanagement/alarms/cli/completer/AlarmFieldValueCompleter.java
@@ -45,6 +45,7 @@
             case TIME_CLEARED:
             case TIME_UPDATED:
                 choices.add(Instant.now().toString());
+                return choices;
             default:
                 return choices;
         }
diff --git a/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/util/OpenstackVtapUtil.java b/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/util/OpenstackVtapUtil.java
index 69919be..d88e132 100644
--- a/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/util/OpenstackVtapUtil.java
+++ b/apps/openstackvtap/app/src/main/java/org/onosproject/openstackvtap/util/OpenstackVtapUtil.java
@@ -28,7 +28,6 @@
 import org.slf4j.Logger;
 
 import java.io.ByteArrayOutputStream;
-import java.io.PrintStream;
 import java.nio.charset.StandardCharsets;
 
 import static org.onosproject.openstacknetworking.api.Constants.ANNOTATION_NETWORK_ID;
@@ -187,7 +186,6 @@
      */
     public static void dumpStackTrace(Logger log, Exception e) {
         ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
-        e.printStackTrace(new PrintStream(outputStream));
         log.error("\n{}", new String(outputStream.toByteArray(), StandardCharsets.UTF_8));
     }
 
diff --git a/apps/pim/src/main/java/org/onosproject/pim/impl/PimApplication.java b/apps/pim/src/main/java/org/onosproject/pim/impl/PimApplication.java
index 8d76e31..36948c1 100644
--- a/apps/pim/src/main/java/org/onosproject/pim/impl/PimApplication.java
+++ b/apps/pim/src/main/java/org/onosproject/pim/impl/PimApplication.java
@@ -49,9 +49,6 @@
     @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected CoreService coreService;
 
-    // Our application ID
-    private static ApplicationId appId;
-
     // Register to receive PIM packets, used to send packets as well
     @Reference(cardinality = ReferenceCardinality.MANDATORY)
     protected PacketService packetService;
@@ -75,7 +72,7 @@
     @Activate
     public void activate() {
         // Get our application ID
-        appId = coreService.registerApplication("org.onosproject.pim");
+        ApplicationId appId = coreService.registerApplication("org.onosproject.pim");
 
         // Build the traffic selector for PIM packets
         TrafficSelector.Builder selector = DefaultTrafficSelector.builder();
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventHintSupplier.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventHintSupplier.java
index 076bfc0..3ad1847 100644
--- a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventHintSupplier.java
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/EventHintSupplier.java
@@ -22,5 +22,5 @@
  */
 @FunctionalInterface
 public interface EventHintSupplier {
-    String apply(Event event) throws Throwable;
+    String apply(Event event);
 }
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/TimerChain.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/TimerChain.java
index 33c6aa3..1118568 100644
--- a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/TimerChain.java
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/TimerChain.java
@@ -16,6 +16,7 @@
 package org.onosproject.workflow.api;
 
 import java.util.Date;
+import java.util.Objects;
 import java.util.PriorityQueue;
 import java.util.Timer;
 import java.util.TimerTask;
@@ -212,6 +213,24 @@
             return date().compareTo(target.date());
         }
 
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) {
+                return true;
+            }
+            if (!(o instanceof TimerChainTask)) {
+                return false;
+            }
+            TimerChainTask that = (TimerChainTask) o;
+
+            return this.date().equals(that.date());
+        }
+
+        @Override
+        public int hashCode() {
+            return Objects.hash(date);
+        }
+
         /**
          * Copies timer chain task.
          * @return timer chain task
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkFlowEngine.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkFlowEngine.java
index 15cd8cd..e4d545d 100644
--- a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkFlowEngine.java
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/WorkFlowEngine.java
@@ -259,7 +259,7 @@
                 log.info("sleep {}", i);
                 Thread.sleep(10L * (i + 1));
             } catch (InterruptedException e) {
-                e.printStackTrace();
+                Thread.currentThread().interrupt();
             }
         }
     }
diff --git a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/example/SampleWorkflow.java b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/example/SampleWorkflow.java
index c09bec2..20b3771 100644
--- a/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/example/SampleWorkflow.java
+++ b/apps/workflow/app/src/main/java/org/onosproject/workflow/impl/example/SampleWorkflow.java
@@ -167,7 +167,7 @@
             try {
                 Thread.sleep(ms);
             } catch (InterruptedException e) {
-                e.printStackTrace();
+                Thread.currentThread().interrupt();
             }
         }
     }