NetBeans IDE Dev (Build 20070419-0904)
1.6.0; Java HotSpot(TM) Client VM 1.6.0-b105
Linux version 2.6.16-1.2122_FC5 running on i386
en_US (nb); UTF-8

Open of a jsp file and every action in the jsp editor produces many exceptions like:

java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java:1206)
        at
org.netbeans.modules.languages.LanguagesManager.getLanguage(LanguagesManager.java:89)
        at
org.netbeans.modules.languages.parser.LLSyntaxAnalyser.readEmbeddings(LLSyntaxAnalyser.java:258)
        at
org.netbeans.modules.languages.parser.LLSyntaxAnalyser.read2(LLSyntaxAnalyser.java:200)
        at
org.netbeans.modules.languages.parser.LLSyntaxAnalyser.read(LLSyntaxAnalyser.java:109)
        at
org.netbeans.modules.languages.ParserManagerImpl.parse(ParserManagerImpl.java:293)
        at
org.netbeans.modules.languages.ParserManagerImpl.parseAST(ParserManagerImpl.java:244)
        at
org.netbeans.modules.languages.ParserManagerImpl.access$000(ParserManagerImpl.java:67)
        at
org.netbeans.modules.languages.ParserManagerImpl$1.run(ParserManagerImpl.java:156)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:539)
        at
org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:964)


or
java.lang.Exception: Stack trace
        at java.lang.Thread.dumpStack(Thread.java:1206)
        at
org.netbeans.modules.languages.LanguagesManager.getLanguage(LanguagesManager.java:89)
        at
org.netbeans.modules.languages.features.MyFirstDrawLayer.updateContext(MyFirstDrawLayer.java:128)
        at
org.netbeans.editor.DrawEngine.computeFragmentDisplayWidth(DrawEngine.java:470)
        at
org.netbeans.editor.DrawEngine.drawCurrentTokenFragment(DrawEngine.java:783)
        at org.netbeans.editor.DrawEngine.drawCurrentToken(DrawEngine.java:880)
        at org.netbeans.editor.DrawEngine.draw(DrawEngine.java:1062)
        at org.netbeans.editor.DrawEngineLineView.paint(DrawEngineLineView.java:239)
        at
org.netbeans.lib.editor.view.GapBoxViewChildren.paintChildren(GapBoxViewChildren.java:783)
        at org.netbeans.lib.editor.view.GapBoxView.paint(GapBoxView.java:1463)
        at
org.netbeans.lib.editor.view.GapDocumentView.paint(GapDocumentView.java:231)
        at org.netbeans.editor.DrawEngineDocView.paint(DrawEngineDocView.java:314)
        at org.netbeans.editor.view.spi.LockView.paint(LockView.java:363)
        at javax.swing.plaf.basic.BasicTextUI$RootView.paint(BasicTextUI.java:1421)


The jsp file define its style in <style> section.