JDBC - How can I detect a Stale Connection?

Hi There,
So here is my problem. My software is using a simple implementation of a connection pool to create/store/provide connections.
Every weekend the database is being shut down and restarted by my DBA. On Monday morning the application can no longer access the DB and I get errors like this:
java.sql.SQLException: No more data to read from socket
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:146)
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:208)
at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1118)
at oracle.jdbc.driver.T4CMAREngine.unmarshalSB1(T4CMAREngine.java:1070)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:478)
at oracle.jdbc.driver.T4CStatement.doOall8(T4CStatement.java:207)
at oracle.jdbc.driver.T4CStatement.executeForDescribe(T4CStatement.java:790)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1031)
at oracle.jdbc.driver.T4CStatement.executeMaybeDescribe(T4CStatement.java:830)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1124)
at oracle.jdbc.driver.OracleStatement.executeQuery(OracleStatement.java:1264)
The connection pool is checking the connections to see if they are closed before giving them out but the check must be indicating that the connections are not closed.
What should I be checking to ensure that only live connections are passed to my application? Or do I need to change my approach to solve this problem.
Any info is greatly appreciated. Thanks.

Would executing a simple statement every time the
something requests
a connection take up a significant amount of time?
The general problem is that the client machine doesn't get notified that the connection is dead until it actually tries to use it.
Executing a simple query may or may not add a significant overhead to the application. It really depends on how much your application does between opening and closing a connection. The more processing it is doing, the less the overhead of a trivial statement.
Or your connection pool could automaticallyconsider
a connection stale if it has been open more than a
few hours and automatically close it and open anew
one.
But this wouldn't prevent that exception from
occurring
when the DB is restarted.I'm not sure I understand the concern here. If you say that a connection is stale after 4 hours or after getting used N times, you would provide some insulation to connections that had been idle in the pool for days at a time, which tends to increase the probability that something had caused the connection to fail.
In your case, I'm assuming that you have a pool of connections that are opened on Friday, become invalid some time over the weekend, and then are used on Monday. These connections would be "too old" for the connection pool to hand out on Monday morning, so the pool would presumably open new connections on Monday and close the old ones.
Your application could also be modified to catchthis
sort of exception and to retry a number of times
before reporting the failure.
When the DB is restarted the exception is reported
for all connections and
the app needs to be restarted to create new
connections.If the number of retries is sufficient, it should cycle through all the connections in the pool, which should force the pool to open all new physical connections. Of course, you might also add a method to your connection pool that forces it to return a new physical connection that gets called after N failures from your app.
Justin

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You might want to experiment with this. It's not perfect, but...
Class
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Let me know your results please?
Still lost in code, just at a little higher level.

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JDBC - How can I detect a Stale Connection?

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