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WorkflowProcessInstanceUpgrader throwing ClassCastException: ...CommandBasedStatefulKnowledgeSession cannot be cast to ...InternalKnowledgeRuntime
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created by <a href="https://community.jboss.org/people/zabalet">Marcelo Zabalet</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/789794#789794">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi people!</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>I'm having this issue trying to upgrade process intances using WorkflowProcessInstanceUpgrader as described at <a class="jive-link-external-small" href="http://docs.jboss.org/jbpm/v5.4/userguide/ch.core-basics.html#d0e2318">http://docs.jboss.org/jbpm/v5.4/userguide/ch.core-basics.html#d0e2318</a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>This is the line creating the knowledgeSession:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">ksession = JPAKnowledgeService.newStatefulKnowledgeSession(knowledgeBase, null, env);
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>and this is the line trying to upgrade:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">WorkflowProcessInstanceUpgrader.upgradeProcessInstance(knowledgeSession, processInstance.getId(), newProcessDefinitionId, mapping);
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Inside <a class="jive-link-external-small" href="https://github.com/droolsjbpm/jbpm/blob/5.4.0.Final/jbpm-flow/src/main/java/org/jbpm/workflow/instance/WorkflowProcessInstanceUpgrader.java">WorkflowProcessInstanceUpgrader </a>there is the casting causing the problem</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><pre class="jive-pre"><code class="jive-code jive-java">processInstance.setKnowledgeRuntime((InternalKnowledgeRuntime) kruntime);
</code></pre><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>The point is that CommandBasedStatefulKnowledgeSession does not implements InternalKnowledgeRuntime like his counterparts implementing StatefulKnowledgeSession.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>   _StatefulKnowledgeSession</p><p>    |__CommandBasedStatefulKnowledgeSession (NOT implements InternalKnowledgeRuntime)</p><p>    |__StatefulKnowledgeSessionImpl (implements InternalKnowledgeRuntime)</p><p>    |__StatefulProcessSession (implements InternalKnowledgeRuntime)</p><p>    </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Then:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>- Should CommandBasedStatefulKnowledgeSession implement InternalKnowledgeRuntime like his counterparts?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>- Should I use a different implementation of StatefulKnowledgeSession?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>- There is a bigger issue around this inherent to the command based nature?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>(This same issue was somehow asked <a class="jive-link-message-small" href="https://community.jboss.org/message/634907#634907">here (https://community.jboss.org/message/634907#634907)</a> but there was no feedback)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>TIA.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Marcelo.</p></div>
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