[rules-users] When MinaTaskClient.complete throw NullPointerException

[Kris Verlaenen]

When using the human task service in combination with JPA, you should
use the CommandBasedWSHumanTaskHandler, not the default WSHumanTaskHandler:
http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-process/drools-process-task/src/main/java/org/drools/process/workitem/wsht/CommandBasedWSHumanTaskHandler.java

The reason is that in that case, the completion of a human task should
also be executed as part of a JPA transaction, hence the slightly
modified handler.

Kris

Quoting liuzhikun <liuzhikun at viewhigh.com.cn>:

> Hi.
>    I use human task in JPA,when i call MinaTaskClient.complete throw
> below error:
> java.lang.NullPointerException
>  at
>
org.drools.persistence.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:83)
>  at
>
org.drools.process.workitem.wsht.WSHumanTaskHandler$GetCompletedTaskResponseHandler.execute(WSHumanTaskHandler.java:282)
>  at
>
org.drools.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:67)
>  at
>
org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:752)
>  at
>
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)2009-9-2
> 13:50:26 org.apache.mina.filter.logging.LogLevel$4 log
>  at
>
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
>  at
>
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
>  at
>
org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:379)
>  at
>
org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:173)
>  at
>
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
>  at
>
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
>  at
>
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
>  at
>
org.apache.mina.core.filterchain.DefaultIoFilterChain$HeadFilter.messageReceived(DefaultIoFilterChain.java:616)
>  at
>
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
>  at
>
org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:408)
>  at
>
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:578)
>  at
>
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:540)
>  at
>
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:532)
>  at
>
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:58)
>  at
>
org.apache.mina.core.polling.AbstractPollingIoProcessor$Worker.run(AbstractPollingIoProcessor.java:857)
>  at
>
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
>  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown
> Source)
>  at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
> Source)
>  at java.lang.Thread.run(Unknown Source)
> 




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