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java.lang.NullPointerException: 	at net.sourceforge.jnlp.cache.ResourceTracker.initializeResource(ResourceTracker.java:778)	at net.sourceforge.jnlp.cache.ResourceTracker.processResource(ResourceTracker.java:611)	at net.sourceforge.jnlp.cache.ResourceTracker.access$500(ResourceTracker.java:72)	at net.sourceforge.jnlp.cache.ResourceTracker$Downloader$1.run(ResourceTracker.java:1115)	at net.sourceforge.jnlp.cache.ResourceTracker$Downloader$1.run(ResourceTracker.java:1113)	at java.security.AccessController.doPrivileged(Native Method)	at net.sourceforge.jnlp.cache.ResourceTracker$Downloader.run(ResourceTracker.java:1113)	at java.lang.Thread.run(Thread.java:679)