Ever since I got the Java update I can't seem to run any of my classwork Java programs. No matter what I do, I get this error: Exception in thread "main" java.lang.NoClassDefFoundError Even in a simple HelloWorld! program I get this error. All of my programs, even ones that worked before, have started behaving like this. Anyone else have this kind of problem? *EDIT* Even the ready-to-compile java files I got form the book's CD are acting like this!!