Fixed Issues raised in the comments

components/iot-plugins/arduino-plugin/org.wso2.carbon.device.mgt.iot.arduino.api/src/main/java/org/wso2/carbon/device/mgt/iot/arduino/service/impl/ArduinoServiceImpl.java

@@ -139,9 +139,7 @@ public class ArduinoServiceImpl implements ArduinoService {
                     return Response.status(Response.Status.ACCEPTED.getStatusCode()).entity(result).build();
                 } catch (NoSuchElementException ex) {
                     result = "There are no more controls for device " + deviceId + " of owner " + owner;
-                    if (log.isDebugEnabled()) {
+                    log.error(result, ex);
-                        log.debug(result);
-                    }
                     return Response.status(Response.Status.NO_CONTENT.getStatusCode()).entity(result).build();
                 }
             }

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.input.adapter.extension/src/main/java/org/wso2/carbon/device/mgt/iot/input/adapter/extension/ContentTransformer.java

@@ -1,3 +1,21 @@
+/*
+*  Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+*
+*  WSO2 Inc. 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.wso2.carbon.device.mgt.iot.input.adapter.extension;
 
 import java.util.Map;

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.input.adapter.extension/src/main/java/org/wso2/carbon/device/mgt/iot/input/adapter/extension/DefaultContentTransformer.java

@@ -1,3 +1,21 @@
+/*
+*  Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+*
+*  WSO2 Inc. 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.wso2.carbon.device.mgt.iot.input.adapter.extension;
 
 import java.util.Map;

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.input.adapter.extension/src/main/java/org/wso2/carbon/device/mgt/iot/input/adapter/extension/DefaultContentValidator.java

@@ -1,3 +1,21 @@
+/*
+*  Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+*
+*  WSO2 Inc. 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.wso2.carbon.device.mgt.iot.input.adapter.extension;
 
 import java.util.Map;

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.output.adapter.ui.endpoint/src/main/java/SuperTenantSubscriptionEndpoint.java

@@ -78,7 +78,7 @@ public class SuperTenantSubscriptionEndpoint extends SubscriptionEndpoint {
 			try {
 				session.close(new CloseReason(CloseReason.CloseCodes.CANNOT_ACCEPT, "Unauthorized Access"));
 			} catch (IOException e) {
-				log.error("Failed to disconnect the unauthorized client.");
+				log.error("Failed to disconnect the unauthorized client.", e);
 			}
 		}
 	}

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.output.adapter.ui.endpoint/src/main/java/TenantSubscriptionEndpoint.java

@@ -77,7 +77,7 @@ public class TenantSubscriptionEndpoint extends SubscriptionEndpoint {
             try {
                 session.close(new CloseReason(CloseReason.CloseCodes.CANNOT_ACCEPT, "Unauthorized Access"));
             } catch (IOException e) {
-                log.error("Failed to disconnect the unauthorized client.");
+                log.error("Failed to disconnect the unauthorized client.", e);
             }
         }
     }
@@ -92,7 +92,8 @@ public class TenantSubscriptionEndpoint extends SubscriptionEndpoint {
     @OnMessage
     public void onMessage (Session session, String message, @PathParam("streamname") String streamName, @PathParam("tdomain") String tdomain) {
         if (log.isDebugEnabled()) {
-            log.debug("Received and dropped message from client. Message: " + message+", for Session id: "+session.getId()+", for tenant domain"+tdomain+", for the Adaptor:"+streamName);
+            log.debug("Received and dropped message from client. Message: " + message + ", for Session id: " +
+                              session.getId() + ", for tenant domain" + tdomain + ", for the Adaptor:" + streamName);
         }
     }
 

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.output.adapter.ui.endpoint/src/main/java/util/ServiceHolder.java

@@ -18,9 +18,9 @@ public class ServiceHolder {
                 .getThreadLocalCarbonContext().getOSGiService(UIOutputCallbackControllerService.class, null);
     }
 
-    public synchronized static ServiceHolder getInstance(){
+    public synchronized static ServiceHolder getInstance() {
-        if (instance==null){
+        if (instance == null) {
-            instance= new ServiceHolder();
+            instance = new ServiceHolder();
         }
         return instance;
     }

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.output.adapter.ui.endpoint/src/main/java/util/UIConstants.java

@@ -1,34 +1,31 @@
 /*
- *
+*  Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
- *  *
+*
- *  *  Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
+*  WSO2 Inc. licenses this file to you under the Apache License,
- *  *
+*  Version 2.0 (the "License"); you may not use this file except
- *  *  WSO2 Inc. licenses this file to you under the Apache License,
+*  in compliance with the License.
- *  *  Version 2.0 (the "License"); you may not use this file except
+*  You may obtain a copy of the License at
- *  *  in compliance with the License.
+*
- *  *  You may obtain a copy of the License at
+*    http://www.apache.org/licenses/LICENSE-2.0
- *  *
+*
- *  *  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
- *  *  Unless required by applicable law or agreed to in writing,
+* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- *  *  software distributed under the License is distributed on an
+* KIND, either express or implied.  See the License for the
- *  *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+* specific language governing permissions and limitations
- *  *  KIND, either express or implied.  See the License for the
+* under the License.
- *  *  specific language governing permissions and limitations
+*/
- *  *  under the License.
- *  *
- *
- */
 
 package util;
 
 /**
  * This class contains the constants related to ui client.
  */
-public class UIConstants {
+public final class UIConstants {
 
     private UIConstants() {
     }
+
     public static final String ADAPTER_UI_COLON = ":";
     public static final String MAXIMUM_TOTAL_HTTP_CONNECTION = "maximumTotalHttpConnection";
     public static final String MAXIMUM_HTTP_CONNECTION_PER_HOST = "maximumHttpConnectionPerHost";

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.output.adapter.ui/src/main/java/org/wso2/carbon/device/mgt/iot/output/adapter/ui/UIEventAdapter.java

@@ -1,5 +1,4 @@
 /*
- *
  *  Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
  *
  *  WSO2 Inc. licenses this file to you under the Apache License,
@@ -78,7 +77,6 @@ public class UIEventAdapter implements OutputEventAdapter {
 
     @Override
     public void init() throws OutputEventAdapterException {
-
         tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
 
         //ExecutorService will be assigned  if it is null
@@ -198,7 +196,6 @@ public class UIEventAdapter implements OutputEventAdapter {
 
     @Override
     public void publish(Object message, Map<String, String> dynamicProperties) {
-
         Event event = (Event) message;
         StringBuilder eventBuilder = new StringBuilder("[");
 
@@ -275,7 +272,6 @@ public class UIEventAdapter implements OutputEventAdapter {
 
     @Override
     public void destroy() {
-
         int tenantId = CarbonContext.getThreadLocalCarbonContext().getTenantId();
 
         ConcurrentHashMap<String, String> tenantSpecificAdapterMap = UIEventAdaptorServiceDataHolder

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.output.adapter.ui/src/main/java/org/wso2/carbon/device/mgt/iot/output/adapter/ui/authentication/oauth/OAuthTokenValdiator.java

@@ -72,7 +72,8 @@ public class OAuthTokenValdiator {
 			Properties properties = getWebSocketConfig();
 			this.stubs = new GenericObjectPool(new OAuthTokenValidaterStubFactory(properties));
 		} catch (IOException e) {
-			log.error("Failed to parse the web socket org.wso2.carbon.device.mgt.iot.output.adapter.ui.config file " + WEBSOCKET_CONFIG_LOCATION);
+			log.error("Failed to parse the web socket org.wso2.carbon.device.mgt.iot.output.adapter.ui.config file " +
+							  WEBSOCKET_CONFIG_LOCATION, e);
 		}
 	}
 

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.output.adapter.ui/src/main/java/org/wso2/carbon/device/mgt/iot/output/adapter/ui/authentication/oauth/OAuthTokenValidaterStubFactory.java

@@ -30,6 +30,8 @@ import org.apache.commons.httpclient.contrib.ssl.EasySSLProtocolSocketFactory;
 import org.apache.commons.httpclient.params.HttpConnectionManagerParams;
 import org.apache.commons.httpclient.protocol.Protocol;
 import org.apache.commons.httpclient.protocol.ProtocolSocketFactory;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.apache.commons.pool.BasePoolableObjectFactory;
 import org.apache.log4j.Logger;
 import org.wso2.carbon.device.mgt.iot.output.adapter.ui.authentication.oauth.exception.OAuthTokenValidationException;
@@ -46,7 +48,7 @@ import java.util.Properties;
  * This follows object pool pattern to manage the stub for oauth validation service.
  */
 public class OAuthTokenValidaterStubFactory extends BasePoolableObjectFactory {
-	private static final Logger log = Logger.getLogger(OAuthTokenValidaterStubFactory.class);
+	private static final Log log = LogFactory.getLog(OAuthTokenValidaterStubFactory.class);
 	private HttpClient httpClient;
 	Properties tokenValidationProperties;
 

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.output.adapter.ui/src/main/java/org/wso2/carbon/device/mgt/iot/output/adapter/ui/constants/WebsocketConstants.java

@@ -1,5 +1,4 @@
 /*
- *
  *  Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
  *
  *  WSO2 Inc. licenses this file to you under the Apache License,

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.output.adapter.ui/src/main/java/org/wso2/carbon/device/mgt/iot/output/adapter/ui/internal/UIEventAdaptorServiceDataHolder.java

@@ -1,5 +1,4 @@
 /*
- *
  *  Copyright (c) 2016, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
  *
  *  WSO2 Inc. licenses this file to you under the Apache License,
@@ -31,10 +30,10 @@ import java.util.concurrent.LinkedBlockingDeque;
 public final class UIEventAdaptorServiceDataHolder {
 
     private static UIOutputCallbackControllerServiceImpl UIOutputCallbackRegisterServiceImpl;
-    private static ConcurrentHashMap<Integer,ConcurrentHashMap<String, String>>
+    private static ConcurrentHashMap<Integer, ConcurrentHashMap<String, String>>
-            tenantSpecificOutputEventStreamAdapterMap = new ConcurrentHashMap<Integer,ConcurrentHashMap<String, String>>();
+            tenantSpecificOutputEventStreamAdapterMap = new ConcurrentHashMap<>();
     private static ConcurrentHashMap<Integer, ConcurrentHashMap<String, LinkedBlockingDeque<Object>>>
-            tenantSpecificStreamEventMap = new ConcurrentHashMap<Integer, ConcurrentHashMap<String, LinkedBlockingDeque<Object>>>();
+            tenantSpecificStreamEventMap = new ConcurrentHashMap<>();
     private static EventStreamService eventStreamService;
 
     public static void registerEventStreamService(EventStreamService eventBuilderService) {

components/iot-plugins/iot-base-plugin/org.wso2.carbon.device.mgt.iot.output.adapter.ui/src/main/java/org/wso2/carbon/device/mgt/iot/output/adapter/ui/internal/UILocalEventAdapterServiceComponent.java

@@ -88,10 +88,13 @@ public class UILocalEventAdapterServiceComponent {
             } catch (WebsocketValidationConfigurationFailedException e) {
                 log.error("Failed to initialize configuration for websocket.", e);
             } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
-                e.printStackTrace();
+                log.error("Failed to initialize the class authentication and authorization given " +
+                                  "in the websocket validation configuration.", e);
             }
         } catch (RuntimeException e) {
             log.error("Can not create the output ui adapter service ", e);
+        } catch (Throwable e) {
+            log.error("Error occurred while activating UI Event Adapter Service Component", e);
         }
     }