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| J2EE/EJBs and MQWF 3.6? |
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| GNaschenweng |
 Posted: Fri Mar 10, 2006 6:20 am Post subject: J2EE/EJBs and MQWF 3.6? |
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Newbie
Joined: 10 Mar 2006
Posts: 1
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Hi all,
We are kicking off a project, where we would like to use EJBs (a SessionFacade) as a service to communicate with workflow. When reading through the EJB example in WA03 I have a few questions:
- What is the purpose of carrying the session-id back and forth (i.e. between Application Server and presentation tier)? Isn't the OID sufficient or does the session-id provide any caching?
- Once the EJB has instantiated an Agent and retrieved a session-id via the ExecutionService (through logon2), will a connection to WF ever time out and how is this managed?
- Using a stateless-session bean, are there any limitations to number of connections to WF? i.e. the J2EE-container will start as many SLSB as required - doesn't this create a potential problem by running out of WF-connections on the server?
- How does clustering/work-load management work? i.e. if a portlet gets a session-id from a business-service in a clustered Websphere environment, and WLM delegates subsequent calls to another WAS-instance (not the same where the session-id was created before) - how is this non-session-affinity managed between client/server?
- How is transactional support management? The pure-Java APIs do not really provide XA-connectors to support 2-phase commits. So the only option would be for the SLSB to participate in a user-defined transaction.
- As part of the MQWF Java APIs I am missing features such as a J2C/JCA connector in order to reap the J2EE container benefits (transaction support, resource management, security etc) and it would have been nice to do a JNDI lookup to a MQWF-factory providing this functionality (similar
to a QueueConnectionFactory for MQ or a datasource for databases).
Has anyone got practical experience on how to do this according to best-practice? IBMs documentation is not very specific for custom J2EE applications?
I believe XML-messages are out of the question, since from the Programming Manual I gather that XML-messages are not supported for WorkItem/WorkList functionality, but only for ProcessInstance interaction.
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