Stand alone weblogic keeps running out of memory ! Cause of Memory Leakage?

Hi all,
I have a machine with 16gb ram and 500gb hard disk with linux os. I have installed weblogic server in it with an adf application deployed on it. So now the problem every two weeks the machine keeps running out of memory . Could it be because of connection leakage ?
There are only a couple of people accessing the application time and again.
When i checked for the data source connection count in weblogic server under data sources , it mostly shows around 10 - 20 connections.
What are various reasons for leakage of connection in ADF application ?
I have not made any explicit jdbc calls in our application .
There is a couple of PL/SQL calls to an external api(this is done in the application module) through db links and rest all is just plain accessing of application modules and view objects .
So what could be the reason if any memory leakage is occuring ?
My application module configuration is
  <AppModuleConfigBag ApplicationName="model.am.AuthenticationAM">
      <AppModuleConfig jbo.project="model.Model" DeployPlatform="LOCAL" name="AuthenticationAMLocal" ApplicationName="model.am.AuthenticationAM">
         <AM-Pooling jbo.ampool.maxinactiveage="300000" jbo.ampool.initpoolsize="44" jbo.ampool.maxpoolsize="60" jbo.recyclethreshold="40" jbo.ampool.minavailablesize="0" jbo.ampool.monitorsleepinterval="120000"/>
         <Database jbo.locking.mode="optimistic" jbo.TypeMapEntries="OracleApps"/>
         <Security AppModuleJndiName="model.am.AuthenticationAM"/>
         <Custom JDBCDataSource="java:comp/env/jdbc/ConnectionDBDS" jbo.rowid_am_datasource_name="java:comp/env/jdbc/ROWIDAM_DBDS"/>Thanks in advance
Sam
Edited by: Sam47 on 19-Oct-2012 01:46

Hi Suspito ,
Thanks for the link ..
Is that the standard configuration for weblogic server?
If at all there are connection leaks in the application in the weblogic server under datasource will it show the count of all the database connection open ?
-Sam

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