How to achieve BC4J stateful management in a web app?

Question

I have a web application developed with JSP, Struts as the view / controller layer and BC4J as the model layer.
I am not using the complete ADF framework. Just plain struts, JSP and BC4J.
What I want to do is to have one struts action to set a
query condition on a view object and execute the query.
Then i release the application module. In another struts action I want to get the same application module with the
viewobject query set.
Pseudo for Action 1:
try{
Configuration.createRootApplicationModule("test.bc.AppModule", "AppModuleLocal");
.. get view object
.. build and perform the query on the view object.
finally
Configuration.releaseRootApplicationModule(am, true);
pseudo for action2:
try{
Configuration.createRootApplicationModule("test.bc.AppModule", "AppModuleLocal");
.. get view object with the query stored
.. use the results.
finally
Configuration.releaseRootApplicationModule(am, true);
I cannot make this work. If I put the am from action1 in the session object and retrieves it from the session in action2 it works. But I need to release the appmodule in action 1 since I have no guarantees that the user will run action2..
I have read the paper of Steve Muench "Understanding Application Module Pooling Concepts and: Configuration Parameters"
This document says:
"ADF application modules provides the ability to snapshot and reactivate their pending state to XML (stored on the file system or in the database), and the ADF application module pooling mechanism leverages this capability to deliver a "managed state" option to web application developers that simplifies building applications like the example just given.
As a performance optimization, when an instance of an AM is returned to the pool in "managed state" mode, the pool keeps track that the AM is referenced by that particular session. The AM instance is still in the pool and available for use, but it would prefer to be used by the same session that was using it last time because maintaining this so-called "session affinity" improves performance.
I have set my bc4j configurations to
releasmode = STATEFUL
jbo.passivationstore = databse
jbo.server.internal_connection= my jdbc connection
But the appmodule returned in action2 is not the same as the one returned in action1.
I am using jdev 9052 and deploying to oc4j 904 standalone.
I guess I have to use som other commands for retrieving/ releasing the AM or set some properties on it, but I have not found any documentation for this.
Any tips on how to achieve this bc4j session state to work in a plain struts , bc4j environment is appreciated.

Answer 1

The Configuration.createRootApplicationModule() and companion releaseRootApplicationModule() API's are not for use in web applications. They are designed for use by simple command-line console programs.
Using the BC4J application module pool programmatically in a web environment should be done like the JDeveloper 9.0.3/9.0.4 "Pooling" sample illustrates.
In the JDev 9.0.3 or 9.0.4 version, see the sample project under ./BC4J/samples/Pooling
Hope this helps.