Okay, so I should probably know this but here's the situation. I was happily compiling code last week. I began looking at Servlets and playing around with the WebLogic Server I have running on my laptop. I needed to send in one of the OOP assignments that was ready. I went to compile and review it before sending it and received this error when I tried to run it: Exception in thread "main" java.lang.NoclassDefFound Error: classname I didn't change the classpath. I have even compiled and tried running the program using full path names. Nothing is working. I searched the archives but didn't see a definitive answer. Anyone have any ideas?