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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

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java.lang.NullPointerException: 	at java.util.Hashtable.put(Hashtable.java:380)	at gis.gistermserver.abstraction.ThemeIndexElem.setAppProperty(ThemeIndexElem.java:179)	at de.disy.gis.imis.imisadapter.IMISMetaDataQueryLogic.addGeometryTypes(IMISMetaDataQueryLogic.java:388)	at de.disy.gis.imis.imisadapter.IMISMetaDataQueryLogic.readAllThemes(IMISMetaDataQueryLogic.java:312)	at de.disy.gis.imis.imisadapter.IMISMetaDataQueryLogic.readSchema(IMISMetaDataQueryLogic.java:158)	at de.disy.gis.imis.imisadapter.IMISMetaDataQueryLogic.getMetaData(IMISMetaDataQueryLogic.java:90)	at gis.spatialadapter.management.QueryLogicInterface.getMetaData(QueryLogicInterface.java:92)	at gis.gistermserver.abstraction.GisSystem.getMetaData(GisSystem.java:495)	at gis.gistermserver.GisTermServer.readGisSystemMetaData(GisTermServer.java:762)	at gis.gistermserver.GisTermServer.getGisSystem(GisTermServer.java:458)	at gis.gistermserver.GisTermServer.getGisSystemInterface(GisTermServer.java:351)	at gis.gisterm.GisTerm.openGisSystemSessionStatic(GisTerm.java:1363)	at gis.services.mml.ServerQueryHandler.endElement(ServerQueryHandler.java:93)	at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1489)	at org.apache.crimson.parser.Parser2.content(Parser2.java:1700)	at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1468)	at org.apache.crimson.parser.Parser2.content(Parser2.java:1700)	at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1468)	at org.apache.crimson.parser.Parser2.content(Parser2.java:1700)	at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1468)	at org.apache.crimson.parser.Parser2.content(Parser2.java:1700)	at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1468)	at org.apache.crimson.parser.Parser2.content(Parser2.java:1700)	at org.apache.crimson.parser.Parser2.maybeElement(Parser2.java:1468)	at org.apache.crimson.parser.Parser2.parseInternal(Parser2.java:499)	at org.apache.crimson.parser.Parser2.parse(Parser2.java:304)	at org.apache.crimson.parser.XMLReaderImpl.parse(XMLReaderImpl.java:433)	at gis.services.mml.MMLParser.parse(MMLParser.java:161)	at gis.services.mml.MMLService.loadMap(MMLService.java:357)	at gis.services.mml.MMLService.loadMap(MMLService.java:112)	at de.condat.imis.app.darstellungen.karten.Karte.build(Unknown Source)	at de.condat.imis.app.darstellungen.karten.KartenNode.enter(Unknown Source)	at de.condat.imis.gui.BrowserController.handlePathSelected(Unknown Source)	at de.condat.imis.gui.NavigationPane.valueChanged(Unknown Source)	at javax.swing.JTree.fireValueChanged(JTree.java:2269)	at javax.swing.JTree$TreeSelectionRedirector.valueChanged(JTree.java:2575)	at javax.swing.tree.DefaultTreeSelectionModel.fireValueChanged(DefaultTreeSelectionModel.java:612)	at javax.swing.tree.DefaultTreeSelectionModel.notifyPathChange(DefaultTreeSelectionModel.java:1006)	at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPaths(DefaultTreeSelectionModel.java:288)	at javax.swing.tree.DefaultTreeSelectionModel.setSelectionPath(DefaultTreeSelectionModel.java:171)	at javax.swing.JTree.setSelectionPath(JTree.java:1088)