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This exception has no message.
java.lang.NullPointerException: 	at sun.misc.URLClassPath$3.run(URLClassPath.java:316)	at java.security.AccessController.doPrivileged(Native Method)	at sun.misc.URLClassPath.getLoader(URLClassPath.java:313)	at sun.misc.URLClassPath.getLoader(URLClassPath.java:290)	at sun.misc.URLClassPath.findResource(URLClassPath.java:141)	at java.net.URLClassLoader$2.run(URLClassLoader.java:362)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findResource(URLClassLoader.java:359)	at java.lang.ClassLoader.getResource(ClassLoader.java:977)	at org.cubrc.gmshell.gui.MainWin.preInit(MainWin.java:152)	at org.cubrc.gmshell.gui.MainWin.(MainWin.java:135)