[jboss-user] [jBPM] - Re: Exception retrieving task

jnorris do-not-reply at jboss.com
Tue Jun 26 10:00:22 EDT 2012 

jnorris [https://community.jboss.org/people/jnorris] created the discussion

"Re: Exception retrieving task"

To view the discussion, visit: https://community.jboss.org/message/744275#744275

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Hi All,

I'm pretty sure the issues with getting a task are due to the I18NText null values.  When a process is started a task is created.  There are also 2 rows created in the I18NText table.  The first row has a value for TASK_DESCRIPTIONS_ID and nulls for TASK_SUBJECTS_ID and TASK_NAMES_ID.  The second row has a value for TASK_SUBJECTS_ID and nulls for TASK_DESCRIPTIONS_ID and TASK_NAMES_ID.  I would think only one row would be created for a task.  Does anyone have a clue what's  going on?

This is a critical issue for me and I have missed a deadline already because of it.

I'd appreciate any help in resolving this matter.

BTW, getting a list of tasks for a user works fine.  Any other methods such as getTask, claimTask, etc. all cause a null pointer exception to be thrown similar to the one included below:

Jim

     [java] Hibernate: select subjects0_.Task_Subjects_Id as Task4_1_, subjects0_.id as id1_, subjects0_.id as id7_0_, subjects0_.language as language7_0_, subjects0_.text as text7_0_ from I18NText su
bjects0_ where subjects0_.Task_Subjects_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.mina.core.filterchain.DefaultIoFilterChain.callPreviousFilterWrite(DefaultIoFilterChain.java:509)
     [java]     at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireFilterWrite(DefaultIoFilterChain.java:501)
     [java]     at org.apache.mina.core.session.AbstractIoSession.write(AbstractIoSession.java:490)
     [java]     at org.apache.mina.core.session.AbstractIoSession.write(AbstractIoSession.java:435)
     [java]     at org.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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