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java.lang.NullPointerException: 	at java.util.jar.JarVerifier.processEntry(JarVerifier.java:267)	at java.util.jar.JarVerifier.update(JarVerifier.java:194)	at java.util.jar.JarFile.initializeVerifier(JarFile.java:251)	at java.util.jar.JarFile.getInputStream(JarFile.java:313)	at sun.misc.URLClassPath$5.getInputStream(URLClassPath.java:617)	at sun.misc.Resource.getBytes(Resource.java:57)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:247)	at java.net.URLClassLoader.access$100(URLClassLoader.java:54)	at java.net.URLClassLoader$1.run(URLClassLoader.java:193)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:186)	at java.lang.ClassLoader.loadClass(ClassLoader.java:299)	at java.lang.ClassLoader.loadClass(ClassLoader.java:292)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)	at java.lang.ClassLoader.loadClass(ClassLoader.java:255)	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)	at my.com.camtech.encryptor.jp.EncEncryptor.generateEncryption(EncEncryptor.java:459)	at my.com.camtech.encryptor.jp.EncEncryptor.jButton1ActionPerformed(EncEncryptor.java:394)	at my.com.camtech.encryptor.jp.EncEncryptor.access$000(EncEncryptor.java:25)	at my.com.camtech.encryptor.jp.EncEncryptor$1.actionPerformed(EncEncryptor.java:85)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1764)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1817)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:419)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:257)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)	at java.awt.Component.processMouseEvent(Component.java:5134)	at java.awt.Component.processEvent(Component.java:4931)	at java.awt.Container.processEvent(Container.java:1566)	at java.awt.Component.dispatchEventImpl(Component.java:3639)	at java.awt.Container.dispatchEventImpl(Container.java:1623)	at java.awt.Component.dispatchEvent(Component.java:3480)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3450)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3165)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)	at java.awt.Container.dispatchEventImpl(Container.java:1609)	at java.awt.Window.dispatchEventImpl(Window.java:1590)	at java.awt.Component.dispatchEvent(Component.java:3480)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:197)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)