What is Exception in thread "main" java.lang.NoClassDefFoundError?
I know how frustrating is to see Exception in thread "main" java.lang.NoClassDefFoundError Which is a manifestation of NoClassDefFoundError in Java , I have seen it couple of times and spent quite a lot time initially to figure out what is wrong , which class is missing etc. First mistake I did was mingling java.lang.ClassNotfoundException and NoClassDefFoundError, in reality they are totally different and second mistake was using trial and error method to solve this java.lang.NoClassDefFoundError instead of understanding why NoClassDefFoundError is coming, what is real reason behind NoClassDefFoundError and how to resolve this. In this Java tutorial I have tried to rectify that mistakes and uncover some secrets of NoClassDefFoundError in Java and will share my experience around it. NoClassDefFoundError is not something which cannot be resolved or hard to resolve it’s just its manifestation which puzzles most of Java developer. This is the most common error in Java development along with java.lang.OutOfMemoroyError: Java heap space and java.lang.OutOfMemoryError: PermGen space Anyway let’s see Why NoClassDefFoundError comes in Java and what to do to resolve NoClassDefFoundError in Java.
