Hello,
I am having trouble understanding the best time and place to persist my Process
Instance when tasks are involved.
I have a servlet that creates a new process instance from a definition which is
retrieved via a user managed transaction:
| JbpmSession session =
JbpmSessionFactory.getInstance().openJbpmSessionAndBeginTransaction()
| ProcessDefinition def = session.getGraphSession().
| findLatestProcessDefinition(?DEF_NAME?);
| ProcessInstance pi = new ProcessInstance(def);
| pi.signal();
| session.commitTransactionAndClose();
|
The process instance then arrives at a task node, with an AssignmentHandler
associated, which does the following:
| public void assign( Assignable assignable, ExecutionContext context ){
| assignable.setActorId(?myUsername?);
| context.getTaskInstance().start();
| JbpmSession session =
JbpmSessionFactory.getInstance().openJbpmSessionAndBeginTransaction();
| session.getGraphSession().saveProcessInstance(context.getProcessInstance());
| session.commitTransactionAndClose();
| }
|
However it is failing at the
session..getGraphSession().saveProcessInstance(context.getProcessInstance());
Line with the exception:
Illegal attempt to associate a collection with two open sessions
Can you please explain what I am doing wrong here? I have arrived at this
junction after trying many different options and I cant think of any other way.
I have the following questions:
| 1.) can I start the transaction instance in the assignment handler? if not,
where do I start it?
| 2.) do I save the process instance in the assignment handler (or from any
other class that is part of the process instance execution)? If not, how and
where do I carry out the persistence after the process instance is in a wait
state? If so, why am i getting the above error when saving?
| 3.) currently I have 2 JbpmSessionFactorys. 1 for classes not involved in
the process instance (servlets etc) and 1 for classes involved in the process
instance (actions, assignment handlers etc). How can I have only 1 session
factory thats used by all classes? I tried using JNDI, but we are using Tomcat
as our application server, and its Initial Context is read only, so I cant
place the session factory in there.
|
| Thanks for your help.
|
| toby
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