Details
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Bug
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Resolution: Done
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Major
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jBPM 4.4
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None
Description
Related to JBPM-2703.
I have a process definition with two custom nodes, refering to ActivityBehaviour classes Custom1 and Custom2. Class Custom1 sets a process variable named "bean" of class Bean, and Custom2 reads and uses this variable:
public class Bean implements Serializable { private int value; public int getValue() { return value; } public void setValue(int value) { this.value = value; } } public class Custom1 implements ActivityBehaviour { public void execute(ActivityExecution execution) throws Exception { Bean bean = new Bean(); bean.setValue(42); execution.setVariable("bean", bean); } } public class Custom2 implements ActivityBehaviour { public void execute(ActivityExecution execution) throws Exception { Bean bean = (Bean)execution.getVariable("bean"); if (bean.getValue() != 42) { throw new Exception("Value must be 42!"); } } }
All these classes were added to the deployment using addResourcesFromZipInputStream/addResourceFromInputStream. So far this works fine.
However, when I put a task node between custom1 and custom2 (apparently causing the variable to be serialized?), things go awry:
java.lang.ClassCastException: [...].Bean cannot be cast to [...].Bean
at [...].Custom2.execute(Custom2.java:6)
at org.jbpm.pvm.internal.wire.usercode.UserCodeActivityBehaviour.execute(UserCodeActivityBehaviour.java:42)
at org.jbpm.pvm.internal.model.op.ExecuteActivity.perform(ExecuteActivity.java:60)
at ...etc...
So it seems that there are two Bean-classes, loaded by different classloaders. I've traced this problem to the DeploymentObjectInputStream, which creates a new DeploymentClassLoader each time it enters the catch-clause. Since the second Bean-class is loaded by a different classloader, it is incompatible with the first.
