Configuring a 
<valid-connection-checker-class-name>org.jboss.resource.adapter.jdbc.vendor.OracleValidConnectionChecker</valid-connection-checker-class-name>
 sometimes causes a 
OutOfMemoryError: unable to create new native thread caused by 
oracle.jdbc.dbaccess.DBAccess.pingDatabase

This has happened on a newly started JBoss 4.0.4.GA server using EJB3 and 
Oracle 9i and
JAVA_OPTS=-server -Xms200m -Xmx1000m -XX:MaxPermSize=256m

Can anyone give me some pointers where to look to avoid this?

We have had problems with OracleValidConnectionChecker before, I was wondering 
if anyone else has the feeling that it should be avoided even though the JBoss 
Wiki recommends it.

Dave

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