[thibaut_barrere]

.Net has GCHandle [1] and I believe the JVM calls to JNI have a similar mechanism (GetXXCritical [2])

[1] http://www.shafqatahmed.com/2008/05/memory-control.html

[2] http://publib.boulder.ibm.com/infocenter/javasdk/v5r0/index....