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ConnectionPool problem

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We are having problems running our application (JSPs, servlets, ejbs) on weblogic. Memory is not freed up and over a period of time, the runtime heap is becoming full and slowing the server.
After working with jprobe, for each database transaction oracle objects keep on accumulated on the heap. This is happening when I was using weblogic connection pool.
I tested our application again, this time not using connection pool. Everytime getting a new connection from database and releasing the connection after use. I found that no objects are accumulated on the heap and all objects are freed.
So I suspect something wrong with the connectionpool.
Here I am copying the connectionpool configuration from weblogic server (config.xml). Please tell me if anything is wrong with this.
<JDBCDataSource DeploymentOrder="1000"
JNDIName="com.verizon.warp.UserPool" Name="UserPool"
PoolName="oraclePool" Targets="myserver"/>
<JDBCConnectionPool CapacityIncrement="2"
InitialCapacity="4" LoginDelaySeconds="1" MaxCapacity="10"
Targets="myserver" TestTableName="dual" URL="jdbc:oracle:thin:@<hostname>:1521:<ORACLE_SID>"/>
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