NullPointerException error when running a process instance migrated from jbpm 5 to BPM Suite 6

Solution Unverified - Updated -

Issue

We migrated our active process instance from jbpm 5.x to BPM Suite 6 and when we run our process we have the following exception:

Caused by: java.lang.NullPointerException
                at java.io.ByteArrayInputStream.<init>(ByteArrayInputStream.java:118)
                at org.drools.persistence.info.WorkItemInfo.getWorkItem(WorkItemInfo.java:116)
                at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.internalGetWorkItem(JPAWorkItemManager.java:213)
                at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:141)
                at org.drools.core.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:75)
                at org.drools.core.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:35)
                at org.drools.core.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36)

What could be wrong?

Environment

  • Red Hat JBoss BPM Suite
    • 6.x

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