Need the most performance and scalable way to "trigger" JavaEE application

Hi,
Need the most performance and scalable way to "trigger" JavaEE application code running on WLS from PLSQL code.
There are some thirdparty JavaEE application running on WLS that we need to invoke from PLSQL code. I have looked at couple of options:
Option 1)
Use oracle db callouts(http call etc.) but it seems the connection to WLS will not be maintained across database-sessions and so every call from different plsql database-session will make fresh TCP/IP connection. Usually fresh socket connection setup is expensive and can become a bottleneck.
Option 2)
Use AQ in the database from PLSQL and have a MDB in WLS to invoke the java code. The problem here is how do I simulate the Request/Reply pattern using the AQ API from PLSQL. The PLSQL code needs to wait until the JavaEE code completes as it needs some result back from JavaEE app. AQ also does not have true temporary queues so I am not sure how it will work with concurrent user/sessions.
Option 3)
Use Java in the database, we have tried this but for our usecase it is too expensive resource wise and is not meeting our performance needs.
Performance is the triggering mechanism is of highest interest to us.
Any suggestions/pointers is greatly appreciated.
Thanks,
Prantor
Edited by: Prantor on Nov 8, 2010 10:37 PM

Perhaps you would benefit from viewing the problem differently.
In some/many/most cases the application server (WLS) invokes procedure residing in the DB server.
Place the control for the desired results in the application code running on the WLS.

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