java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at sun.misc.URLClassPath$3.run(URLClassPath.java:313)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:310)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:287)
at sun.misc.URLClassPath.getResource(URLClassPath.java:157)
at java.net.URLClassLoader$1.run(URLClassLoader.java:192)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.net.FactoryURLClassLoader.loadClass(URLClassLoader.java:580)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at StandAlone.Runner.main(Runner.java:16)

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