I'm trying to get Java and MASON installed properly. I can run most of the examples, but the 3D examples all crash with this error: java.lang.NoClassDefFoundError: javax/media/j3d/Node Java is installed at: D:\Programs\Java\jdk1.6.0_11 j3d is installed at: D:\Programs\Java\jdk1.6.0_11\j3d-jre JAVA_HOME = D:\Programs\Java\jdk1.6.0_11 CLASSPATH = .;D:\Programs\Java\jdk1.6.0_11 Other directories under JAVA_HOME include colt-1.2.0 jfreechart-1.0.12 Got the error mentioned above. Then I tried moved j3d, colt, and jfreechart under: D:\Programs\Java\jdk1.6.0_11\jre Got the same error in MASON on the 3D examples. What am I doing wrong? Should I have a CLASSPATH that specifies every directory that contains a jar file? Any suggestions would be much appreciated... -Mike