Can I use pass-by-reference with GlassFish?

Answer: By default, arguments are passed by value as required by the Java EE specification. If you want to pass them by reference, just like with Weblogic, pass-by-reference can be specified in sun-ejb-jar.xml. Remember that this is not portable Java EE.

See also this documentation :

• Sun Java System Application Server 9.1 Application Deployment Guide