Java Development Tools

There are about 40 people including 30 programmers and 10 testers in a team. They use Jdeveloper 11.1.1.2, weblogic 10.3.2.0, and oracle 10g.
The max connection pool is 500.

The code snippets are as follow.

1, (ApplicationModule)JSFUtils.resolveExpression("#{data." + name +".dataProvider}");
2, The ViewObject is used by ApplicationModule and rows of VO are changed.
3, ApplicationModule is used in backing bean for commit and rollback.
4, ViewRowImpl:

public class DistressInfoByzcbhViewRowImpl extends ViewRowImpl {

….

public String getSomething(){

SysCodeAMImpl codeAm=(SysCodeAMImpl)Configuration.createRootApplicationModule("com.sunz.model.am.commonmodule.SysCodeAM", "SysCodeAMLocal");

….

Configuration.releaseRootApplicationModule(codeAm, true);

….

}

}

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After running the page http://127.0.0.1:7101/DL-viewcontroller-context-root/faces/portalDaiban?_afrLoop=31082873706450&_adf.ctrl-state=1qme8hi02_14
the connection pool will increase if the page is refreshed.

After the page http://127.0.0.1:7101/goldland-viewcontroller-context-root/faces/portalDaiban
runs, if the page is refreshed the connection pool number will increase 1 each time.

Sometime, the connection pool number will increase 0 to 4 if the page is reloaded.

After all browsers are closed, the connection pool is still high.

I want the connection pool number can be stable and not increase.