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JavaRanch » Java Forums » Java » Performance
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Closed Connection

Viswa Sethu
Ranch Hand

Joined: Nov 01, 2007
Posts: 31

In our aplication we are recieving the following closed connection exception randomly.
java.sql.SQLException: Closed Connection
at oracle.jdbc.dbaccess.DBError.throwSqlException(
at oracle.jdbc.dbaccess.DBError.throwSqlException(
at oracle.jdbc.dbaccess.DBError.throwSqlException(
at oracle.jdbc.driver.OracleConnection.privatePrepareStatement(
at oracle.jdbc.driver.OracleConnection.prepareStatement(
at weblogic.jdbc.pool.Connection.prepareStatement(

And this exception is thrown from different class. But when the same screen is accessed again then these exceptions arent thrown. This happens wehn the application uis loaded with more users.
We are using weblogic 7.0 and database Oracle 9i. JDK1.4 and JDBC version

Is this because of a connection breakage between the appl server and db server? Though when thse above error occurs, i could connect to database from sql plus.

I see an option in weblogic to test Reserved/Released connection; if we enable this option, will it have any adverse effect in the application performance > I believe this will validate the connection everytime the client request for a new conenction from the weblogic pool.
Please throw some light.


Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42958
Please do not post the same question to multiple forums: CarefullyChooseOneForum

Let's continue the discussion in this duplicate thread.
I agree. Here's the link:
subject: Closed Connection
It's not a secret anymore!