Whattha?! - java.lang.classnotfoundexception

[Dreamcatchermatt]

I'm using NetBeans IDE.

I just saved my latest version, accedentaly clicked 'Build and Clean' insted of 'Run' and now i'm getting the following error:

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run: Exception in thread "main" java.lang.NoClassDefFoundError: EntitySystem/Entity         at isogameengine_01.Main.main(Main.java:21) Caused by: java.lang.ClassNotFoundException: EntitySystem.Entity         at java.net.URLClassLoader$1.run(URLClassLoader.java:202)         at java.security.AccessController.doPrivileged(Native Method)         at java.net.URLClassLoader.findClass(URLClassLoader.java:190)         at java.lang.ClassLoader.loadClass(ClassLoader.java:307)         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)         at java.lang.ClassLoader.loadClass(ClassLoader.java:248)         ... 1 more Java Result: 1 BUILD SUCCESSFUL (total time: 2 seconds)

To the best of my knowlage, I have not changed ANYTHING apart from accedentaly clicking the 'Build and Clean' button...

can anyone tell me what is this, why might it have happened and how could I fix it?

[Bonbon-Chan]

I have strange behaviour with Netbeans recently... ClassNotFound... Class that doesn't overwrite abstract method when it does...

For one project, I change compilation from Java 1.5 to Java 1.6 and it "solved" the problem. For another, I disable the compile on change...

There is really something strange 

[Dreamcatchermatt]

Nice one    I just turned off 'Compile on Save' and it works again!

... that is well weird.

Does anyone have any ideas as to what might be the actual issue? I'm allways a bit woried when something weird happens and I cant find an explenation. I always wonder what else is going to come out of the woodwork...