java.lang.NullPointerException
        at org.netbeans.modules.docbook.DocBookCatalog$Reader.resolveEntity(DocBookCatalog.java:83)
        at org.netbeans.modules.xml.catalog.CatalogEntityResolver.resolveEntity(CatalogEntityResolver.java:77)
        at org.netbeans.modules.j2ee.ddloaders.web.DDGrammarQueryManager.getGrammar(DDGrammarQueryManager.java:81)
        at org.netbeans.modules.xml.api.model.GrammarQueryManager$DefaultQueryManager.getGrammar(GrammarQueryManager.java:132)
        at org.netbeans.modules.xml.text.completion.GrammarManager.loadGrammar(GrammarManager.java:261)
        at org.netbeans.modules.xml.text.completion.GrammarManager.getGrammar(GrammarManager.java:99)
        at org.netbeans.modules.xml.text.completion.XMLCompletionQuery.getPerformer(XMLCompletionQuery.java:264)
        at org.netbeans.modules.xml.text.completion.XMLCompletionQuery.queryElements(XMLCompletionQuery.java:276)
        at org.netbeans.modules.xml.text.completion.XMLCompletionQuery.query(XMLCompletionQuery.java:118)
        at org.netbeans.modules.xml.text.completion.XMLCompletionProvider.queryImpl(XMLCompletionProvider.java:101)
        at org.netbeans.modules.xml.text.completion.XMLCompletionProvider.access$100(XMLCompletionProvider.java:47)
        at org.netbeans.modules.xml.text.completion.XMLCompletionProvider$Query.doQuery(XMLCompletionProvider.java:83)
        at org.netbeans.modules.xml.text.completion.XMLCompletionProvider$AbstractQuery.query(XMLCompletionProvider.java:122)
        at org.netbeans.spi.editor.completion.support.AsyncCompletionTask.run(AsyncCompletionTask.java:195)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:499)
[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:932)