[jboss-user] [jBPM] - Exception retrieving task
jnorris
do-not-reply at jboss.com
Mon Jun 25 13:35:49 EDT 2012
jnorris [https://community.jboss.org/people/jnorris] created the discussion
"Exception retrieving task"
To view the discussion, visit: https://community.jboss.org/message/744057#744057
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Hi All,
I'm getting the exception shown below when trying to get a task using the Mina server in the demo task server included with the installer. I've deployed and started a process definition that has a single human task in it. A row is inserted into the TASK table in the Oracle 11g DB. Other task tables with data are CONTENT (1 row), I18NText (2 rows), PEOPLEASSIGNMENTS_BAS (1 row - 'Administrator') and PEOPLEASSIGNMENTS_POTOWNERS (1 row - 'john'). One item of interest is that the column TASKINITIATOR_ID for the task is null. User 'john' started the process and is the single ActorId in the process defintion. Both the CREATEDBY_ID and ACTUALOWNER_ID columns for the task row are set to 'john'.
Client code:
String name = "ksclient-" + UUID.randomUUID();
TaskClient client = new TaskClient( new MinaTaskClientConnector( name, new MinaTaskClientHandler( SystemEventListenerFactory.getSystemEventListener())));
client.connect( "127.0.0.1", 9123 );
Task jbpmTask = this.getTask( id.longValue() );
utility method used in multiple places:
public Task getTask( long taskId, TaskClient client )
{
BlockingGetTaskResponseHandler responseHandler = new BlockingGetTaskResponseHandler();
client.getTask( taskId, responseHandler );
responseHandler.waitTillDone( 1000 );
return responseHandler.getTask();
}
Any help in resolving this would be appreciated.
Jim
Here's the exception:
[java] Task service started correctly!
[java] Task service running ...
[java] Hibernate: select task0_.id as id11_3_, task0_.archived as archived11_3_, task0_.allowedToDelegate as allowedT3_11_3_, task0_.taskInitiator_id as taskIni27_11_3_, task0_.priority as priori
ty11_3_, task0_.activationTime as activati5_11_3_, task0_.actualOwner_id as actualO28_11_3_, task0_.createdBy_id as createdBy29_11_3_, task0_.createdOn as createdOn11_3_, task0_.documentAccessType as
document7_11_3_, task0_.documentContentId as document8_11_3_, task0_.documentType as document9_11_3_, task0_.expirationTime as expirat10_11_3_, task0_.faultAccessType as faultAc11_11_3_, task0_.faultC
ontentId as faultCo12_11_3_, task0_.faultName as faultName11_3_, task0_.faultType as faultType11_3_, task0_.outputAccessType as outputA15_11_3_, task0_.outputContentId as outputC16_11_3_, task0_.outpu
tType as outputType11_3_, task0_.parentId as parentId11_3_, task0_.previousStatus as previou19_11_3_, task0_.processId as processId11_3_, task0_.processInstanceId as process21_11_3_, task0_.processSes
sionId as process22_11_3_, task0_.skipable as skipable11_3_, task0_.status as status11_3_, task0_.workItemId as workItemId11_3_, task0_.OPTLOCK as OPTLOCK11_3_, user1_.id as id6_0_, user2_.id as id6_1
_, user3_.id as id6_2_ from Task task0_ left outer join OrganizationalEntity user1_ on task0_.taskInitiator_id=user1_.id left outer join OrganizationalEntity user2_ on task0_.actualOwner_id=user2_.id
left outer join OrganizationalEntity user3_ on task0_.createdBy_id=user3_.id where task0_.id=?
[java] org.apache.mina.filter.codec.ProtocolEncoderException: java.lang.NullPointerException
[java] at org.apache.mina.filter.codec.ProtocolCodecFilter.filterWrite(ProtocolCodecFilter.java:355)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain.callPreviousFilterWrite(DefaultIoFilterChain.java:509)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1400(DefaultIoFilterChain.java:46)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.filterWrite(DefaultIoFilterChain.java:808)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.filterWrite(DefaultIoFilterChain.java:734)
[java] at org.apache.Hibernate: select names0_.Task_Names_Id as Task5_1_, names0_.id as id1_, names0_.id as id7_0_, names0_.language as language7_0_,mina.core.filterchain.DefaultIoFilterChain
.callPreviousFilterWrite(DefaultIoFilterChain.java:509)
[java] at org.apache.mina.core.filt names0_.text as text7_0_ from I18NText names0_ where names0_.Task_Names_Id=?
[java] Hibernate: select subjects0_.Task_Subjects_Id as erchain.DefaultIoFilterChain.fireFilterWrite(DefaultIoFilterChain.java:501)
[java] at org.apache.mina.core.session.AbstractIoSession.Task4_1_, subjects0_.id as id1_, subjects0_.id as id7_0_, subjects0_.language as language7_0_, subjects0_.text as text7_0_ from write(
AbstractIoSession.java:490)
[java] at org.apache.mina.core.session.AbstractIoSession.write(AbstractIoSession.java:435)
[java] at orgI18NText subjects0_ where subjects0_.Task_Subjects_Id=?
[java] .jbpm.task.service.mina.MinaSessionWriter.write(MinaSessionWriter.java:31)
[java] at org.jbpm.task.service.TaskServerHandler.messageReceived(TaskServerHandler.java:134)
[java] at org.jbpm.task.service.mina.MinaTaskServerHandler.messageReceived(MinaTaskServerHandler.java:41)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:716)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)
[java] at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:427)
[java] at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:245)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)
[java] at org.apache.mina.filter.logging.LoggingFilter.messageReceived(LoggingFilter.java:177)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)
[java] at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)
[java] at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426)
[java] at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:692)
[java] at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:645)
[java] at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:634)
[java] at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:66)
[java] at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1078)
[java] at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
[java] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
[java] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
[java] at java.lang.Thread.run(Thread.java:662)
[java] Caused by: java.lang.NullPointerException
[java] at java.io.ObjectOutputStream$BlockDataOutputStream.getUTFLength(ObjectOutputStream.java:2106)
[java] at java.io.ObjectOutputStream$BlockDataOutputStream.writeUTF(ObjectOutputStream.java:1977)
[java] at java.io.ObjectOutputStream.writeUTF(ObjectOutputStream.java:849)
[java] at org.jbpm.task.I18NText.writeExternal(I18NText.java:53)
[java] at org.jbpm.task.utils.CollectionUtils.writeI18NTextList(CollectionUtils.java:235)
[java] at org.jbpm.task.Task.writeExternal(Task.java:92)
[java] at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1429)
[java] at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1398)
[java] at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
[java] at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1346)
[java] at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1154)
[java] at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
[java] at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
[java] at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
[java] at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
[java] at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
[java] at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
[java] at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
[java] at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
[java] at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
[java] at org.apache.mina.core.buffer.AbstractIoBuffer.putObject(AbstractIoBuffer.java:2011)
[java] at org.apache.mina.filter.codec.serialization.ObjectSerializationEncoder.encode(ObjectSerializationEncoder.java:80)
[java] at org.apache.mina.filter.codec.ProtocolCodecFilter.filterWrite(ProtocolCodecFilter.java:322)
[java] ... 36 more
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