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:323)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:320)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:297)
at sun.misc.URLClassPath.getResource(URLClassPath.java:167)
at java.net.URLClassLoader$1.run(URLClassLoader.java:192)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)

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