classcast exception getting tasknode

[ajanz]

i've written my own command to create tasks at runtime.

but when i try to get the tasknode i got an class cast exception

2008-10-20 17:26:23,496 INFO [STDOUT] node name:in Bearbeitung
2008-10-20 17:26:23,496 INFO [STDOUT] node class:class org.jbpm.graph.def.Node_$$_javassist_80
2008-10-20 17:26:23,496 ERROR [STDERR] java.lang.ClassCastException: org.jbpm.graph.def.Node_$$_javassist_80 cannot be cast to org.jbpm.graph.node.TaskNode

although it is really a tasknode...

what am i doing wrong?

here is the code

ProcessInstance pi = jbpmContext.getProcessInstance(processid);

 if (cat.isDebugEnabled()) {
 cat.debug("add task command");
 cat.debug("token:"+ pi.getRootToken().getId());
 cat.debug("node name:"+ pi.getRootToken().getNode().getName());
 cat.debug("node class:"+ pi.getRootToken().getNode().getClass());
 }
 TaskNode tn = (TaskNode) pi.getRootToken().getNode();
 Task t= tn.getTask("mytask");

[kukeltje]

basic hibernate issue. You get a proxy back. Search the internet/hibernate forums how to get the real node type object (I have no bookmark to this, but I think it is something that might be added in the wiki somewhere)

[ajanz]

changed the code to

ProcessInstance pi = jbpmContext.getProcessInstance(processid);
 Task t = pi.getTaskMgmtInstance().getTaskMgmtDefinition().getTask("mytask");

now it works...

[kukeltje]

but this is a 'different node'... it is the node from the processdefinition, not from the processinstance. You cannot (afaik) do anything runtime with it (unless you e.g. want the transitionnames)

[ajanz]

i need it to create a taskinstance

TaskInstance ti = pi.getTaskMgmtInstance()
 .createTaskInstance(t,pi.getRootToken());
 ti.setActorId(actor.toUpperCase());

[kukeltje]

then it is indeed ok to use it from the definition.