gigazhang [https://community.jboss.org/people/gigazhang] created the discussion "jbpm5.3 task complete NullPointerException GetCompletedTaskResponseHandler.execute(AsyncGenericHTWorkItemHandler.java:241)" To view the discussion, visit: https://community.jboss.org/message/744483#744483 -------------------------------------------------------------- https://community.jboss.org/servlet/JiveServlet/showImage/2-744483-18877/... https://community.jboss.org/servlet/JiveServlet/downloadImage/2-744483-18... +ContentData contentData = null;+ +        if (data != null) {+ +            ByteArrayOutputStream bos = new ByteArrayOutputStream();+ +            ObjectOutputStream out = null;+ +            try {+ +                out = new ObjectOutputStream(bos);+ +                out.writeObject(data);+ +                contentData = new ContentData();+ +                System.out.println(bos.toByteArray());+ +                contentData.setContent(bos.toByteArray());+ +                contentData.setAccessType(AccessType.Inline);+ +                out.close();+ +                out = null;+ +                bos.close();+ +                bos = null;+ +            } catch (IOException e) {+ +                e.printStackTrace();+ +            }+ +        }+ +        taskClient.complete(taskId, userId, contentData, operationHandler);+ *when I complete the task,there throws exception:* 2012-06-27 17:34:46,634 INFO [org.apache.mina.filter.logging.LoggingFilter] - <SENT: HeapBuffer[pos=0 lim=0 cap=0: empty]> java.lang.NullPointerException     at org.jbpm.process.workitem.wsht.AsyncGenericHTWorkItemHandler$GetCompletedTaskResponseHandler.execute(AsyncGenericHTWorkItemHandler.java:241)     at org.jbpm.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:81)     at org.jbpm.task.service.mina.MinaTaskClientHandler.messageReceived(MinaTaskClientHandler.java:47)     at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:716)     at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)     at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)     at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)     at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:427)     at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:245)     at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)     at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)     at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)     at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119)     at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)     at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426)     at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:692)     at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:645)     at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:634)     at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:66)     at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1078)     at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)     at java.lang.Thread.run(Thread.java:722) -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/744483#744483] Start a new discussion in jBPM Development at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]