Difficulty during XSLT events tracing

Added by Aristarkh Skvortsov over 10 years ago

Hello! Could you, please, advise. I'm trying to perform some XSL transformation using Saxon#9.1.0.8, and it worked fine until I added trace listener to the controller. Exception which I have got:

The context item is not set
; SystemID: file:/E:/docbook/xsl/common/l10n.xsl; Line#: 22; Column#: -1
net.sf.saxon.trans.XPathException: The context item is not set
	at net.sf.saxon.expr.Expression.dynamicError(Expression.java:967)
	at net.sf.saxon.expr.ContextItemExpression.evaluateItem(ContextItemExpression.java:172)
	at net.sf.saxon.expr.ExpressionTool.evaluate(ExpressionTool.java:296)
	at net.sf.saxon.instruct.GeneralVariable.getSelectValue(GeneralVariable.java:374)
	at net.sf.saxon.instruct.LocalParam.processLeavingTail(LocalParam.java:143)
	at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:556)
	at net.sf.saxon.instruct.Template.expand(Template.java:220)
	at net.sf.saxon.instruct.CallTemplate.process(CallTemplate.java:257)
	at net.sf.saxon.instruct.DocumentInstr.evaluateItem(DocumentInstr.java:278)
	at net.sf.saxon.expr.ExpressionTool.evaluate(ExpressionTool.java:296)
	at net.sf.saxon.instruct.GeneralVariable.getSelectValue(GeneralVariable.java:374)
	at net.sf.saxon.instruct.LocalParam.processLeavingTail(LocalParam.java:143)
	at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:556)
	at net.sf.saxon.instruct.Template.expand(Template.java:220)
	at net.sf.saxon.instruct.CallTemplate$CallTemplatePackage.processLeavingTail(CallTemplate.java:440)
	at net.sf.saxon.instruct.ApplyTemplates.apply(ApplyTemplates.java:212)
	at net.sf.saxon.instruct.ApplyTemplates.process(ApplyTemplates.java:170)
	at net.sf.saxon.instruct.DocumentInstr.evaluateItem(DocumentInstr.java:278)
	at net.sf.saxon.expr.ExpressionTool.evaluate(ExpressionTool.java:296)
	at net.sf.saxon.instruct.GeneralVariable.getSelectValue(GeneralVariable.java:374)
	at net.sf.saxon.instruct.Instruction.assembleParams(Instruction.java:147)
	at net.sf.saxon.instruct.CallTemplate.processLeavingTail(CallTemplate.java:291)
	at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:556)
	at net.sf.saxon.instruct.Template.applyLeavingTail(Template.java:203)
	at net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:293)
	at net.sf.saxon.instruct.ApplyTemplates.apply(ApplyTemplates.java:210)
	at net.sf.saxon.instruct.ApplyTemplates.process(ApplyTemplates.java:170)
	at net.sf.saxon.instruct.DocumentInstr.evaluateItem(DocumentInstr.java:278)
	at net.sf.saxon.functions.StringFn.evaluateItem(StringFn.java:54)
	at net.sf.saxon.functions.NormalizeSpace.evaluateItem(NormalizeSpace.java:75)
	at net.sf.saxon.instruct.SimpleContentConstructor.evaluateItem(SimpleContentConstructor.java:261)
	at net.sf.saxon.instruct.ValueOf.processLeavingTail(ValueOf.java:243)
	at net.sf.saxon.instruct.Template.applyLeavingTail(Template.java:203)
	at net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:293)
	at net.sf.saxon.instruct.ApplyTemplates.apply(ApplyTemplates.java:210)
	at net.sf.saxon.instruct.ApplyTemplates.process(ApplyTemplates.java:170)
	at net.sf.saxon.instruct.DocumentInstr.evaluateItem(DocumentInstr.java:278)
	at net.sf.saxon.expr.ExpressionTool.evaluate(ExpressionTool.java:296)
	at net.sf.saxon.instruct.GeneralVariable.getSelectValue(GeneralVariable.java:374)
	at net.sf.saxon.instruct.LocalParam.processLeavingTail(LocalParam.java:143)
	at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:556)
	at net.sf.saxon.instruct.Template.expand(Template.java:220)
	at net.sf.saxon.instruct.CallTemplate.process(CallTemplate.java:257)
	at net.sf.saxon.instruct.CallTemplate.processLeavingTail(CallTemplate.java:281)
	at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:556)
	at net.sf.saxon.instruct.Instruction.process(Instruction.java:93)
	at net.sf.saxon.instruct.ElementCreator.processLeavingTail(ElementCreator.java:296)
	at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:556)
	at net.sf.saxon.instruct.Instruction.process(Instruction.java:93)
	at net.sf.saxon.instruct.ElementCreator.processLeavingTail(ElementCreator.java:296)
	at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:556)
	at net.sf.saxon.expr.LetExpression.processLeavingTail(LetExpression.java:557)
	at net.sf.saxon.instruct.Template.applyLeavingTail(Template.java:203)
	at net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:293)
	at net.sf.saxon.instruct.ApplyTemplates.defaultAction(ApplyTemplates.java:378)
	at net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:284)
	at net.sf.saxon.instruct.ApplyTemplates.apply(ApplyTemplates.java:210)
	at net.sf.saxon.instruct.ApplyTemplates.processLeavingTail(ApplyTemplates.java:174)
	at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:556)
	at net.sf.saxon.instruct.Choose.processLeavingTail(Choose.java:686)
	at net.sf.saxon.instruct.Block.processLeavingTail(Block.java:556)
	at net.sf.saxon.instruct.Choose.processLeavingTail(Choose.java:686)
	at net.sf.saxon.expr.LetExpression.processLeavingTail(LetExpression.java:557)
	at net.sf.saxon.instruct.Template.applyLeavingTail(Template.java:203)
	at net.sf.saxon.instruct.ApplyTemplates.applyTemplates(ApplyTemplates.java:293)
	at net.sf.saxon.Controller.transformDocument(Controller.java:1807)
	at net.sf.saxon.Controller.transform(Controller.java:1621)
	at org.ascent.xml.debugger.Debugger$DebuggerTask.transformDocument(Debugger.java:373)
	at org.ascent.xml.debugger.Debugger$DebuggerTask.run(Debugger.java:264)
	at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)

The code which I used to transform is:

    TransformerFactoryImpl factory = new TransformerFactoryImpl();

    Source xslSource = new StreamSource(xslFile);
    Source xmlSource = new StreamSource(xmlFile);

    Transformer newTransformer = factory.newTransformer(xslSource);
    Controller controller = (Controller)newTransformer;

    controller.getConfiguration().setConfigurationProperty(LINE_NUMBERING, true);
    controller.getConfiguration().setConfigurationProperty(COMPILE_WITH_TRACING, true);
    controller.getConfiguration().setConfigurationProperty(ALLOW_EXTERNAL_FUNCTIONS, true);
    controller.getConfiguration().setConfigurationProperty(TIMING, false);
    controller.getConfiguration().setDebugger(new XsltDebugger());
    controller.setErrorListener(new XsltErrorListener());

    controller.addTraceListener(new TraceListenerStub());

    newTransformer.transform(xmlSource, new StreamResult(new File("E:\\result.xml")));

I tried to remove line <controller.addTraceListener(new TraceListenerStub());> and transformation worked fine. Do you have any idea, where I made a mistake?

Thank you.

Replies (1)

RE: Difficulty during XSLT events tracing - Added by Michael Kay over 10 years ago

The specification for Controller.addTraceListener() says that it has no effect unless tracing was enabled when the stylesheet was compiled. You've set COMPILE_WITH_TRACING on the Configuration, but only AFTER the stylesheet was compiled. This doesn't immediately explain the failure, but it does suggest that you are doing things wrong.

9.1 is getting a bit old. We appreciate that some people are still using the old Saxon-B because not all features were carried forward into Saxon-HE. However, the chances of us fixing any problems found in Saxon 9.1 are fairly slim at this point unless they are very major.

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