Actually, it should work with setting the bean-pool in sun-ejb-jar.xml. At least, it works for us. ;)
E.g.:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sun-ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Application Server 9.0 EJB 3.0//EN" "
http://www.sun.com/software/appserver/dtds/sun-ejb-jar_3_0-0.dtd">
<sun-ejb-jar>
<enterprise-beans>
<ejb>
<ejb-name>SomeBean</ejb-name>
<jndi-name>queue/SomeBean</jndi-name>
<bean-pool>
<steady-pool-size>1</steady-pool-size>
<resize-quantity>1</resize-quantity>
<max-pool-size>1</max-pool-size>
<pool-idle-timeout-in-seconds>0</pool-idle-timeout-in-seconds>
</bean-pool>
</ejb>
</enterprise-beans>
</sun-ejb-jar>
Cheers
Chris.
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