Java Web Start application receives NullPointerException raised from
com.sun.deploy.security.CPCallbackHandler on Java SE 8 b58 after it was run for a bit over one hour:

2012-09-28 13:34:41,129 ERROR [AWT-EventQueue-0] [humanclick.prep.ui.common.DefaultExceptionHandler] Uncaught Exception: null
java.lang.NullPointerException
        at com.sun.deploy.security.CPCallbackHandler.isAuthenticated(Unknown Source)
        at com.sun.deploy.security.CPCallbackHandler.access$1100(Unknown Source)
        at com.sun.deploy.security.CPCallbackHandler$ChildElement.checkResource(Unknown Source)
        at com.sun.deploy.security.DeployURLClassPath$JarLoader.checkResource(Unknown Source)
        at com.sun.deploy.security.DeployURLClassPath$JarLoader.getResource(Unknown Source)
        at com.sun.deploy.security.DeployURLClassPath.getResource(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
[...]