Closed Conncetion and Conncetion Timed Out

This is Naveen, My application is behaving differently recently. My application uses 2 types of connections. Connection through weblogic connection pool and another one is normal connection (DBManager.getConncetion).
Both are working fine. But recently (from 2009 starting ) while using normal connection, i am getting these following exceptions repeatedly.
1. Closed Conncetion 2. Conncetion Timed Out 3. IO exception
We had gone through each and every line of code and found no issues. Please help me to resolve this issue. Is there any drivers problem, do i need to update the jdbc driver ? Thanks in advance
Naveen

To the point: your code should acquire AND close the connection in the shortest possible scope. Do NOT get hold of it as (static) instance variable.
If you stucks, have your code reviewed by an experienced developer.

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