openjms stress test with database derby and mysql

Hi,
I tried two following test cases.
case1:	openjms0.7.7,connector is http and database is derby.
	subscribed for 10 topics.
	published 1000 messages to 10 different topics.

Result of case1:After publishing around 700 messages,subscriber stops
receiving messages.And at openjms console exceptions are

1.Failed to make message persistent
org.exolab.jms.persistence.PersistenceException: 
com.ibm.db2.jcc.c.SqlException: A lock could not be obtained within the
time requested

2.javax.jms.JMSException: Failed to make message persistent:
org.exolab.jms.persistence.PersistenceException: Failed to add message
handle=org.exolab.jms.messagemgr.TopicConsumerMessageHandle@6598b

case2:openjms0.7.7,connector is http and database is mysql.
	subscribed for  10 topics.
	published 10,000 messages to 10 different topics.

Result of case2:After publishing around 7000 to 8000 messages,subscriber
stops receiving messages.And no exceptions at  openjms console


 Any help would be greatly appreciated.
 
 Thanks,
 Archana


	





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