Re: [docbook-apps] WebHelp - Exception when building

[Kasun Gajasinghe <kasunbg@gmail.com>]

Based on the stack trace, it seems you are using Xalan for xsl transformation. It is recommended to use Saxon 6.5.5 with Webhelp which too is a Java impl. You can point to Saxon by setting xslt-processor-classpath in build.properties to the location of your saxon jar. In the meanwhile, you should also set xercesImpl.jar and xml-apis.jar properties.

# Modify the follosing so that they point to your local
# copy of the jars indicated:
# * Saxon 6.5 jar
# * Xerces 2: xercesImpl.jar
# * xml-commons: xml-apis.jar
xslt-processor-classpath=/usr/share/java/saxon-6.5.5.jar 
xercesImpl.jar=/usr/share/java/xercesImpl.jar
xml-apis.jar=/usr/share/java/xml-apis.jar

HTH

Kasun

On Sat, Sep 1, 2012 at 6:38 PM, Marc Boorshtein <mboorshtein@gmail.com> wrote:

I'm trying to get webhelp working but am hitting a snag.  When I try
to run webhelp on the test xml I get the following exception:


/home/mlb/workspace-x1/AutoIDM-Trunk/dist/doc/manual/prelude/docbook-xsl-1.77.1/webhelp/build.xml:61:
javax.xml.transform.TransformerException:
java.lang.NullPointerException
        at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:732)
        at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:336)
        at org.apache.tools.ant.taskdefs.optional.TraXLiaison.transform(TraXLiaison.java:195)
        at org.apache.tools.ant.taskdefs.XSLTProcess.process(XSLTProcess.java:853)
        at org.apache.tools.ant.taskdefs.XSLTProcess.execute(XSLTProcess.java:389)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:392)
        at org.apache.tools.ant.Target.performTasks(Target.java:413)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
        at org.apache.tools.ant.Main.runBuild(Main.java:811)
        at org.apache.tools.ant.Main.startAnt(Main.java:217)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
Caused by: java.lang.NullPointerException
        at com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary.referenceToNodeSet(BasisLibrary.java:998)
        at webhelp.l10n$dot$language()
        at webhelp.topLevel()
        at webhelp.transform()
        at com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet.transform(AbstractTranslet.java:605)
        at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:725)
        ... 21 more
---------
java.lang.NullPointerException
        at com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary.referenceToNodeSet(BasisLibrary.java:998)
        at webhelp.l10n$dot$language()
        at webhelp.topLevel()
        at webhelp.transform()
        at com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet.transform(AbstractTranslet.java:605)
        at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:725)
        at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:336)
        at org.apache.tools.ant.taskdefs.optional.TraXLiaison.transform(TraXLiaison.java:195)
        at org.apache.tools.ant.taskdefs.XSLTProcess.process(XSLTProcess.java:853)
        at org.apache.tools.ant.taskdefs.XSLTProcess.execute(XSLTProcess.java:389)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
        at org.apache.tools.ant.Task.perform(Task.java:348)
        at org.apache.tools.ant.Target.execute(Target.java:392)
        at org.apache.tools.ant.Target.performTasks(Target.java:413)
        at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1399)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1368)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
        at org.apache.tools.ant.Main.runBuild(Main.java:811)
        at org.apache.tools.ant.Main.startAnt(Main.java:217)
        at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
        at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)

I'm using xsl-1.77.1.  I found a message on this list from february
that said try the snapshot, but 1.77.1 is from June and I didn't see
any other resolution.  Any help would be greatly appreciated.

Thanks
Marc

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--
~~~*******'''''''''''''*******~~~
Kasun Gajasinghe
Software Engineer; WSO2 Inc.; http://wso2.com,

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