Database connection timeouts and datasource errors

Question

Connections in the pool randomly die overnight. Stack traces show that for some reason, the evermind driver is being used even though the MySql connection pool is specified.
Also, the evermind connection pool is saying connections aren't being closed, and the stack trace shows they're being allocated by entity beans that are definitely not left hanging around.
Sometimes we get non-serializable errors when trying to retrieve the datasource (this is only after the other errors start). Some connections returned from the pool are still good, so the application limps along.
EJBs and DAOs both use jdbc/SQLServerDSCore.
Has anyone seen this problem?
<data-sources>
     <data-source
          class="com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource"
          name="SQLServerDSCore"
          location="jdbc/SQLServerDSCore"
          xa-location="jdbc/xa/SQLServerXACore"
          ejb-location="jdbc/SQLServerDSCore"
          connection-driver="com.mysql.jdbc.Driver"
          min-connections="5"
          username="xxx"
          password="xxx"
          staleness-timeout="3600"
          alive-poll-query="SELECT 1 FROM medispan"
          url="jdbc:mysql://1.2.3.4:3306/dbo?autoReconnect=true&autoReconnectForPools=true&cachePrepStmts=true&is-connection-validation-required=true"
          inactivity-timeout="30"
     >
          <property name="autoReconnect" value="true"/>
          <property name="autoReconnectForPools" value="true"/>
          <property name="is-connection-validation-required" value="true"/>
          <property name="cachePrepStmts" value="true"/>
     </data-source>
</data-sources>

Answer 1

Rick,
OC4J 9.0.4.0.0 - BTW, do you know of any patches?As far as I know, there are no patches for the 9.0.4
production version of OC4J stand-alone.
I'm using container managed persistence,It was not clear to me, from your previous post, that you
are using CMP entity beans.
I found staleness-timeout and alive-poll-query
somewhere on a website when trying to track this
down. Here's four sources:Those sources refer to OrionServer -- and an older version, too, it seems.
Like all other Oracle products that start out as somebody
else's -- including, for example, JBuilder (that became "JDeveloper"), Apache Web Server (that became "Oracle HTTP Server") and TopLink -- their development paths diverge, until, eventually, there is absolutely no similarity between them at all. Hence, the latest versions of OC4J and "OrionServer" are so different, that you cannot be sure that something that works for "OrionServer" will work for OC4J.
I recall reading something, somewhere, sometime about configuring OC4J to use different databases (other than Oracle), but I really don't remember any details (since it was not relevant to me, because we only use Oracle database). In any case, it is possible to use a non-Oracle database with OC4J.
Good Luck,
Avi.