comp.lang.java
comp.lang.java.advocacy - support for and criticism of the Java system.
comp.lang.java.announce - announcements re the Java System. (Moderated)
comp.lang.java.api - the Java application programming interface.
comp.lang.java.misc - miscellaneous topics on using the Java System.
comp.lang.java.setup - setting up a Java browser.
comp.lang.java.tech - technical aspects of Java, its inner workings.
comp.lang.javascript
DevX Discussion Groups - Contains forums on Java and related technologies.
Dr. Dobbs: Java Discussion Forum - Threaded message forum for those looking for help or to help.
Java Coffee Break Discussion Forums - Talk Java with your peers, get advice or discuss technology or trends. Free Java message board (registration optional).
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.
JavaCommerce Forums - Web-based forums on topics such as servlets, JDBC, and EJB.
JavaRanch - A friendly place for Java greenhorns. Includes study material for Java certification, a discussion forum and several articles for Java beginners.