JavaRanch Big Moose Saloon - Forums on a range of topics including Java technologies, certification, software engineering, jobs and single products. - http://saloon.javaranch.com/
JavaGaming.org - Message boards for the games developer. - http://www.javagaming.org/
Java Forums - Forums supported by the Java-Tips.org website developers. Topics cover Standard, Enterprise and Micro Edition as well as 3rd party APIs, IDEs and education. - http://www.java-forums.org/
Java Technology Forums - User discussion areas at IBM's developerWorks. - http://www-128.ibm.com/developerworks/forums/dw_jforums.jsp
Java Language Forum at Tek-Tips - Technical support forums and mutual help system for computer professionals. - http://www.tek-tips.com/threadminder.cfm?pid=269
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. - http://tech.groups.yahoo.com/group/portlets/
JavaKB - Discussion threads on JavaBeans, Servlets, JDBC and other Java technologies. - http://www.javakb.com
P2P - Java - A forum where you can share knowledge with fellow programmers. Java section. - http://p2p.wrox.com/default.asp?CAT_ID=19
DevX Discussion Groups - Contains forums on Java and related technologies. - http://news.devx.com/
Artima Forums - Discussion forums for Java, Jini, J2EE, and object-oriented software design and development. - http://www.artima.com/forums/