java.lang.NoClassDefFoundError: Hello (wrong name: hello/Hello)

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java.lang.NoClassDefFoundError: Hello (wrong name: hello/Hello)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLOader.java:509)
at java.security.SecureClassLoader.defineClass(SecureClassoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java246)
at java.net.URLClassLoader.access$100(URLClassLoader.java:4)
at java.net.URLClassLoader$1.run(URLClassLoader.java:193)
at java.security.AccessController.doPrivileged(NativeMethod)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)

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