java.lang.NoClassDefFoundError: HelloWorld (wrong name: com/mypackage/HelloWorld)

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java.lang.NoClassDefFoundError: HelloWorld (wrong name: com/mypackage/HelloWorld)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(
at Method)
at java.lang.ClassLoader.loadClass(
at sun.misc.Launcher$AppClassLoader.loadClass(
at java.lang.ClassLoader.loadClass(
at java.lang.ClassLoader.loadClassInternal(

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