Saxon

While debugging with Oxygen the xml file: 47465.xml with the stylesheet: bho-to-clml.xml and using as configuration file for SaxonEE the "saxon.xml" file, we got the following exception:

ERROR [ TransformationEngine ] ro.sync.xml.transformer.TransformerCreator - Got a NPE trying to validate a stylesheet!! java.lang.NullPointerException
java.lang.NullPointerException: null
        at net.sf.saxon.expr.parser.ExpressionTool.injectCode(ExpressionTool.java:175)
        at net.sf.saxon.trace.TraceCodeInjector.process(TraceCodeInjector.java:46)
        at net.sf.saxon.style.XSLGlobalVariable.compileDeclaration(XSLGlobalVariable.java:299)
        at net.sf.saxon.style.PrincipalStylesheetModule.compile(PrincipalStylesheetModule.java:1291)
        at net.sf.saxon.style.Compilation.compilePackage(Compilation.java:324)
        at net.sf.saxon.trans.packages.PackageLibrary.obtainLoadedPackage(PackageLibrary.java:309)
        at net.sf.saxon.style.Compilation.satisfyPackageDependencies(Compilation.java:205)
        at net.sf.saxon.style.Compilation.compilePackage(Compilation.java:283)
        at net.sf.saxon.style.StylesheetModule.loadStylesheet(StylesheetModule.java:254)
        at net.sf.saxon.style.Compilation.compileSingletonPackage(Compilation.java:113)
        at net.sf.saxon.s9api.XsltCompiler.compile(XsltCompiler.java:971)
        at net.sf.saxon.jaxp.SaxonTransformerFactory.newTemplates(SaxonTransformerFactory.java:174)
        at net.sf.saxon.jaxp.SaxonTransformerFactory.newTransformer(SaxonTransformerFactory.java:131)
        at ro.sync.xml.transformer.TransformerCreator.createInternalXSLTTransformer(TransformerCreator.java:2556)
        at ro.sync.xml.transformer.TransformerCreator.createXSLOrJSONTransformer(TransformerCreator.java:1641)
        at ro.sync.xml.transformer.TransformerCreator.createTransformer(TransformerCreator.java:811)
        at ro.sync.xml.transformer.TransformerCreator.createTransformer(TransformerCreator.java:708)
        at ro.sync.xml.transformer.TransformerCreator.createTransformer(TransformerCreator.java:684)
        at ro.sync.dxsl.debugger.saxon8.SaxonXSLTDebugger.createTransformer(SaxonXSLTDebugger.java:235)
        at ro.sync.dxsl.debugger.AbstractXSLTDebugger.initEngine(AbstractXSLTDebugger.java:429)
        at ro.sync.dxsl.debugger.AbstractXSLTDebugger.run(AbstractXSLTDebugger.java:561)
        at java.base/java.lang.Thread.run(Thread.java:1595)

Please note that we use in Oxygen Saxon 12.3.

We reproduce the problem also from the command line, using the Saxon-EE 12.4:

java -jar saxon-ee-12.4.jar -s:47465.xml -xsl:bho-to-clml.xsl -config:saxon.xml -T
java.lang.NullPointerException: Cannot invoke "net.sf.saxon.expr.Expression.operands()" because "exp" is null
        at net.sf.saxon.expr.parser.ExpressionTool.injectCode(ExpressionTool.java:175)
        at net.sf.saxon.trace.TraceCodeInjector.process(TraceCodeInjector.java:46)
        at net.sf.saxon.style.XSLGlobalVariable.compileDeclaration(XSLGlobalVariable.java:299)
        at net.sf.saxon.style.PrincipalStylesheetModule.compile(PrincipalStylesheetModule.java:1290)
        at net.sf.saxon.style.Compilation.compilePackage(Compilation.java:338)
        at net.sf.saxon.trans.packages.PackageLibrary.obtainLoadedPackage(PackageLibrary.java:309)
        at net.sf.saxon.style.Compilation.satisfyPackageDependencies(Compilation.java:207)
        at net.sf.saxon.style.Compilation.compilePackage(Compilation.java:297)
        at net.sf.saxon.style.StylesheetModule.loadStylesheet(StylesheetModule.java:254)
        at net.sf.saxon.style.Compilation.compileSingletonPackage(Compilation.java:115)
        at net.sf.saxon.s9api.XsltCompiler.compile(XsltCompiler.java:971)
        at net.sf.saxon.Transform.doTransform(Transform.java:777)
        at net.sf.saxon.Transform.main(Transform.java:83)
Fatal error during transformation: java.lang.NullPointerException: Cannot invoke "net.sf.saxon.expr.Expression.operands()" because "exp" is null

Regards, Mircea.