Database connection loosed over night

Hi,
I am testing a J2EE application on Sun Java System Application Server Platform Edition 8.2 (build b06-fcs).
The application uses JNDI, which uses a connection pool to access a MySQL database. The deployment of the applications .ear file works fine, and the connection of the bean works correctly the rest of the day. But on the next day when I try to use the bean from the client application, I get a Local Transport Exception:
System Exception
javax.resource.spi.LocalTransactionException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.io.EOFException
STACKTRACE:
java.io.EOFException
     at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1905)
     at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2351)
     at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2862)
     at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1571)
     at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1666)
     at com.mysql.jdbc.Connection.execSQL(Connection.java:2988)
     at com.mysql.jdbc.Connection.setAutoCommit(Connection.java:4913)
...The ping of the connection pool is still working, at it seems that nothing has changed since yesterday.
Does anybody have any ideas what causes this "overnight" problem?
Thanks in advance,
Istvan

Appserver pools DB connections and your connection expires over night. You should try setting "Connection Validation" checkbox and validate it against some existing table in your DB, see:
http://docs.sun.com/app/docs/doc/819-4712/6n6rit5is?a=view
If this doesn't help you might want to try changing your application to reconnect upon failure. Last thing to try would be plugging in different mysql JDBC driver.

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