Odelya Holiday [http://community.jboss.org/people/odelyaholiday] created the discussion "NullPointerException - on taskclient.complete" To view the discussion, visit: http://community.jboss.org/message/582570#582570 -------------------------------------------------------------- Hi! I am working on tomcat 6 When the application starts - I start the taskserver: server = new MinaTaskServer(taskService); Thread thread = new Thread(server); When the user logs in to my application,  I start a taskclient like this: TaskClient client = new TaskClient(new MinaTaskClientConnector("client 1", new MinaTaskClientHandler( SystemEventListenerFactory.getSystemEventListener()))); boolean connected = client.connect("127.0.0.1", 9123); I am using this taskclient in the code to start and complete it: BlockingTaskOperationResponseHandler responseHandler = new BlockingTaskOperationResponseHandler(); taskClient.start(taskId, userName, responseHandler); BlockingTaskOperationResponseHandler blockingTaskOperationResponseHandler = new BlockingTaskOperationResponseHandler(); taskClient.complete(taskId, userName, result, blockingTaskOperationResponseHandler);   However, once it passes the taskClient.complete I get the exception: org.apache.mina.filter.codec.ProtocolEncoderException: java.lang.NullPointerException      at org.apache.mina.filter.codec.ProtocolCodecFilter.filterWrite(ProtocolCodecFilter.java:313)      at org.apache.mina.core.filterchain.DefaultIoFilterChain.callPreviousFilterWrite(DefaultIoFilterChain.java:506)      at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1400(DefaultIoFilterChain.java:46) What could be the problem? -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/582570#582570] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]