error reading (deserializing) variables from runtimeservice

[sixtdeu]

Hi there,

I'm new to the forum and to Activiti.

I'm using Activiti 5.8 with GLF3.1 and mysql db.

The situation is: Process with service task storing a variable (simple JavaBean object) an user task reading this variable.

Code service task:
public void execute(DelegateExecution execution) throws Exception {
      ApprovalProcessMail mail = new ApprovalProcessMail();
      mail.setMail_subject("test mail");
      execution.setVariable("testVariable", mail);

}

Code reading variable (stateless ejb method):
public boolean performUserTask() {
      Task task = getTaskService().createTaskQuery().taskAssignee("tester")
            .singleResult();
      ApprovalProcessMail mail = (ApprovalProcessMail) runtimeService
            .getVariable(task.getExecutionId(), "testVariable");
      String s = mail.getMail_subject();
      
      return true;
}

ApprovalProcessMail is a simple java bean with some private fields and getter/setter methods. This class also implements serializable.

My problem:

Exception in thread "main" javax.ejb.EJBException
   at com.sun.ejb.containers.BaseContainer.processSystemException(BaseContainer.java:5193)
   at com.sun.ejb.containers.BaseContainer.completeNewTx(BaseContainer.java:5091)
   at com.sun.ejb.containers.BaseContainer.postInvokeTx(BaseContainer.java:4879)
   at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:2039)
   at com.sun.ejb.containers.BaseContainer.postInvoke(BaseContainer.java:1990)
   at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:213)
   at com.sun.ejb.containers.EJBObjectInvocationHandlerDelegate.invoke(EJBObjectInvocationHandlerDelegate.java:79)
   at $Proxy176.performUserTask(Unknown Source)
….

Caused by: org.activiti.engine.ActivitiException: coudn't deserialize object in variable 'testVariable'
   at org.activiti.engine.impl.variable.SerializableType.getValue(SerializableType.java:60)
   at org.activiti.engine.impl.persistence.entity.VariableInstanceEntity.getValue(VariableInstanceEntity.java:158)
   at org.activiti.engine.impl.persistence.entity.VariableScopeImpl.getVariable(VariableScopeImpl.java:93)
   at org.activiti.engine.impl.cmd.GetExecutionVariableCmd.execute(GetExecutionVariableCmd.java:60)
   at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
   at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)
   at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
   at org.activiti.engine.impl.RuntimeServiceImpl.getVariable(RuntimeServiceImpl.java:97)

…

Caused by: java.lang.ClassNotFoundException: com.mycompany.activiti.classes.ApprovalProcessMail
   at com.sun.enterprise.loader.ASURLClassLoader.findClassData(ASURLClassLoader.java:787)
   at com.sun.enterprise.loader.ASURLClassLoader.findClass(ASURLClassLoader.java:696)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
   at java.lang.Class.forName0(Native Method)
   at java.lang.Class.forName(Class.java:264)

I've no idea, what the problem could be. All these classes are stored in same eclipse project and deployed within the same ear file.


Any ideas?

Regards,

Chris

[thilo_ginkel]

Unfortunately, your stack trace is truncated. I guess either the context class loader is not what you expect it to be or Activiti is located in an OSGI bundle separate from your application.

Could you provide some more details about your setup?

[sixtdeu]

Hello @ll there,
thanks for your answer thilo. I was testing and solved my problem. It was what you expected. The problem was the class loader, wrong instance. Now the lib dependencies are set right and I can store objects (implementing Serializable) to the process variable map and read them.

Thanks!

Chris