openJms Server OutOfMemory

  I've been experimenting with version  openjms0.7.6.1 ( RDBMS oracle9.1) 
and used queue objects (PERSISTANT)  via the RMI mode . after I send out a 
total of around 150,000 objects, I get an out of memory exception in the  
JMSServer. I increase the memory for the JVM from 256M to 512M,  but it 
appears to me that would only delay the inevitable,and I configure the 
gc,but no effects ,I can't set Message expired ,because message is 
important to I,it must be not lost
what can i do ? thanks!

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