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java.lang.NullPointerException: 	at java.util.concurrent.ConcurrentSkipListMap.comparable(ConcurrentSkipListMap.java:659)	at java.util.concurrent.ConcurrentSkipListMap.doGet(ConcurrentSkipListMap.java:821)	at java.util.concurrent.ConcurrentSkipListMap.containsKey(ConcurrentSkipListMap.java:1608)	at java.util.concurrent.ConcurrentSkipListSet.contains(ConcurrentSkipListSet.java:214)	at org.springframework.ide.eclipse.beans.core.model.locate.AbstractPathMatchingBeansConfigLocator.locateConfigInFile(AbstractPathMatchingBeansConfigLocator.java:199)	at org.springframework.ide.eclipse.beans.core.model.locate.AbstractPathMatchingBeansConfigLocator.locateBeansConfigs(AbstractPathMatchingBeansConfigLocator.java:90)	at org.springframework.ide.eclipse.beans.ui.properties.ConfigFilesTab$ScannedFilesContentProvider$1.run(ConfigFilesTab.java:615)	at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121)