User task not completed due to "class org.jbpm.workflow.core.node.StartNode cannot be cast to class org.jbpm.workflow.core.node.SubProcessNode" exception in a jbpm process

Solution Verified - Updated -

Issue

A user task can not be completed due to the following exception in a jbpm process:

class org.jbpm.workflow.core.node.StartNode cannot be cast to class org.jbpm.workflow.core.node.SubProcessNode (org.jbpm.workflow.core.node.StartNode and org.jbpm.workflow.core.node.SubProcessNode are in unnamed module of loader 'deployment.ROOT.war' @542670e1):

Environment

  • Openshift (OCP)
    • 3.11
  • Red Hat Process Automation Manager (RHPAM)
    • 7.5
  • PostgreSQL
    • 4.8

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