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java.lang.NullPointerException: 	at java.lang.String.compareTo(String.java:1168)	at org.springframework.ide.eclipse.internal.uaa.monitor.LibraryUsageMonitor.projectClasspathChanged(LibraryUsageMonitor.java:181)	at org.springframework.ide.eclipse.internal.uaa.monitor.LibraryUsageMonitor.access$0(LibraryUsageMonitor.java:164)	at org.springframework.ide.eclipse.internal.uaa.monitor.LibraryUsageMonitor$2.run(LibraryUsageMonitor.java:121)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)