After verifing the code that complete the task, I find that I forget passing the DataContent parameter in complete method :
Old code :
client.complete(aTaskId, aOwnerId, null, responseHandler);
Correct code :
client.complete(aTaskId, aOwnerId, contentData, responseHandler);
But after executing my process, this error appears :
17:17:46,192 ERROR [org.jbpm.process.workitem.wsht.CommandBasedWSHumanTaskHandler] (NioProcessor-6) null: java.io.OptionalDataException
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1358) [rt.jar:1.7.0_15]
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:369) [rt.jar:1.7.0_15]
at org.jbpm.process.workitem.wsht.CommandBasedWSHumanTaskHandler$GetResultContentResponseHandler.execute(CommandBasedWSHumanTaskHandler.java:330) [jbpm-human-task-mina-5.4.0.Final.jar:5.4.0.Final]
at org.jbpm.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:153) [jbpm-human-task-core-5.4.0.Final.jar:5.4.0.Final]
at org.jbpm.task.service.mina.MinaTaskClientHandler.messageReceived(MinaTaskClientHandler.java:47) [jbpm-human-task-mina-5.4.0.Final.jar:5.4.0.Final]
at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:716) [mina-core-2.0.1.jar:]
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) [mina-core-2.0.1.jar:]
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) [mina-core-2.0.1.jar:]
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796) [mina-core-2.0.1.jar:]
at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:427) [mina-core-2.0.1.jar:]
at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:245) [mina-core-2.0.1.jar:]
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) [mina-core-2.0.1.jar:]
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46) [mina-core-2.0.1.jar:]
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796) [mina-core-2.0.1.jar:]
at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119) [mina-core-2.0.1.jar:]
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434) [mina-core-2.0.1.jar:]
at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426) [mina-core-2.0.1.jar:]
at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:692) [mina-core-2.0.1.jar:]
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:645) [mina-core-2.0.1.jar:]
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:634) [mina-core-2.0.1.jar:]
at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:66) [mina-core-2.0.1.jar:]
at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1078) [mina-core-2.0.1.jar:]
at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64) [mina-core-2.0.1.jar:]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_15]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_15]
at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_15]
Thank you very mu for your high-professional response.