Artima Forums
Discussion forums for Java, Jini, J2EE, and object-oriented software design and development.
Java Language Forum at Tek-Tips
Technical support forums and mutual help system for computer professionals.
Java Technology Forums
Java Developer Connection topical interactive message boards.
Java Technology Forums
User discussion areas at IBM's developerWorks.
JavaKB
Discussion threads on JavaBeans, Servlets, JDBC and other Java technologies.
P2P - Java
A forum where you can share knowledge with fellow programmers. Java section.
Portlet Discussion
Portlet is a new and emerging technology. This group is created with the objective of discussing portlets and related technology, their usability and problems associated with them.