I see that the Technical Tips from Sun that appear as periodic newsletters are nuggets of gems.
When you have some time, browse through these tech tips and reap the benefits of being informed.
There is a verbose technical article on Classloading issues in Java RMI and JINI Systems at: Research Paper
The new RMI in Java5: New RMI
Tomcat and OpenLDAP:Tomcat and OpenLDAP
Java Access Control Mechanisms
A case for WeakReferences
A good article on Weak References is:
Understanding Weak References