Caused: java.io.SyncFailedException: File eclipselink.properties already exists in filesystem C:\Users\burak.karas\AppData\Roaming\NetBeans\7.3beta2\config (C:\Users\burak.karas\AppData\Roaming\NetBeans\7.3beta2\config\Preferences\org\netbeans\modules\maven\repositories\eclipselink.properties).
   at org.openide.filesystems.LocalFileSystem.createData(LocalFileSystem.java:279)
   at org.openide.filesystems.LocalFileSystem$Impl.createData(LocalFileSystem.java:587)
   at org.openide.filesystems.AbstractFileObject.createData(AbstractFileObject.java:474)
   at org.openide.filesystems.FileUtil.createData(FileUtil.java:973)
   at org.openide.filesystems.MultiFileObject.createData(MultiFileObject.java:1175)
   at org.openide.filesystems.FileUtil.createData(FileUtil.java:973)
   at org.openide.filesystems.MultiFileObject.createData(MultiFileObject.java:1175)
   at org.openide.filesystems.FileUtil.createData(FileUtil.java:973)
   at org.netbeans.core.startup.preferences.PropertiesStorage.toPropertiesFile(PropertiesStorage.java:313)
   at org.netbeans.core.startup.preferences.PropertiesStorage.outputStream(PropertiesStorage.java:253)
   at org.netbeans.core.startup.preferences.PropertiesStorage.save(PropertiesStorage.java:230)
Caused: java.util.prefs.BackingStoreException: java.io.SyncFailedException: File eclipselink.properties already exists in filesystem C:\Users\burak.karas\AppData\Roaming\NetBeans\7.3beta2\config (C:\Users\burak.karas\AppData\Roaming\NetBeans\7.3beta2\config\Preferences\org\netbeans\modules\maven\repositories\eclipselink.properties).
   at org.netbeans.core.startup.preferences.NbPreferences.flushSpi(NbPreferences.java:228)
   at org.netbeans.core.startup.preferences.NbPreferences$1$1.run(NbPreferences.java:84)
   at org.netbeans.core.startup.preferences.PropertiesStorage$3.run(PropertiesStorage.java:323)
   at org.openide.filesystems.EventControl.runAtomicAction(EventControl.java:127)
   at org.openide.filesystems.FileSystem.runAtomicAction(FileSystem.java:607)
   at org.netbeans.core.startup.preferences.PropertiesStorage.runAtomic(PropertiesStorage.java:321)
   at org.netbeans.core.startup.preferences.NbPreferences$1.run(NbPreferences.java:79)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1454)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2036)