Ant-Task: Specifying classpath internally in the build script leads to Failed to parse error

[nkutsche]

Hi,

In the documentation about declaring the ant task there is this paragraph:

For this Ant Task to be available you need to include the ph-schematron-ant-task "JAR with dependencies" in your classpath. Alternatively you can use the classpath attribute to reference a classpath that is defined internally in the build script.

At least in my case the "Alternative" does not work.

My ant script:

<?xml version="1.0" encoding="UTF-8"?>
<project basedir="." name="ph-schematron test" default="db.common.validation.schematron">
    
    <taskdef name="schematron" classname="com.helger.schematron.ant.Schematron" classpath="lib1.0/ph-schematron-ant-task-5.1.0-jar-with-dependencies.jar"/>
    

    <target name="db.common.validation.schematron">
        <schematron schematronFile="test.sch" expectSuccess="true" failonerror="true">
            <file file="test.xml"/>
        </schematron>
    </target>

</project>

If I just call cls && ant -f build.xml I get this log:

Buildfile: C:\Users\Nico\Desktop\tests\ant\schematron\ph-schematron-usage\build.xml

db.common.validation.schematron:
[schematron] [main] WARN com.helger.xml.transform.LoggingTransformErrorListener - [warn] Transformation warning (javax.xml.transform.TransformerConfigurationException: jar:file:/C:/Users/Nico/Desktop/tests/ant/schematron/ph-schematron-usage/lib1.0/ph-schematron-ant-task-5.1.0-jar-with-dependencies.jar!/schematron/20100710-xslt2/iso_schematron_skeleton_for_saxon.xsl: line 580: Attribut "version" au▀erhalb des Elements.)
[schematron] [main] WARN com.helger.xml.transform.LoggingTransformErrorListener - [warn] Transformation warning (javax.xml.transform.TransformerConfigurationException: jar:file:/C:/Users/Nico/Desktop/tests/ant/schematron/ph-schematron-usage/lib1.0/ph-schematron-ant-task-5.1.0-jar-with-dependencies.jar!/schematron/20100710-xslt2/iso_schematron_skeleton_for_saxon.xsl: line 604: Attribut "version" au▀erhalb des Elements.)
[schematron] [main] WARN com.helger.xml.transform.LoggingTransformErrorListener - [warn] Transformation warning (javax.xml.transform.TransformerConfigurationException: jar:file:/C:/Users/Nico/Desktop/tests/ant/schematron/ph-schematron-usage/lib1.0/ph-schematron-ant-task-5.1.0-jar-with-dependencies.jar!/schematron/20100710-xslt2/iso_schematron_skeleton_for_saxon.xsl: line 623: Attribut "version" au▀erhalb des Elements.)
[schematron] [main] ERROR com.helger.xml.transform.XMLTransformerFactory - Failed to parse javax.xml.transform.dom.DOMSource@47dd778
[schematron] javax.xml.transform.TransformerConfigurationException: Fehler beim Pr³fen des Typs des Ausdrucks "funcall(document-uri, [AbsoluteLocationPath(null)])".
[schematron]    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:988)
[schematron]    at com.helger.xml.transform.XMLTransformerFactory.newTemplates(XMLTransformerFactory.java:300)
[schematron]    at com.helger.schematron.xslt.SchematronProviderXSLTFromSCH.<init>(SchematronProviderXSLTFromSCH.java:195)
[schematron]    at com.helger.schematron.xslt.SchematronResourceSCHCache.createSchematronXSLTProvider(SchematronResourceSCHCache.java:69)
[schematron]    at com.helger.schematron.xslt.SchematronResourceSCHCache.getSchematronXSLTProvider(SchematronResourceSCHCache.java:145)
[schematron]    at com.helger.schematron.xslt.SchematronResourceSCH.getXSLTProvider(SchematronResourceSCH.java:92)
[schematron]    at com.helger.schematron.xslt.AbstractSchematronXSLTBasedResource.isValidSchematron(AbstractSchematronXSLTBasedResource.java:188)
[schematron]    at com.helger.schematron.ant.Schematron.execute(Schematron.java:752)
[schematron]    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
[schematron]    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[schematron]    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[schematron]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[schematron]    at java.lang.reflect.Method.invoke(Method.java:498)
[schematron]    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:99)
[schematron]    at org.apache.tools.ant.Task.perform(Task.java:350)
[schematron]    at org.apache.tools.ant.Target.execute(Target.java:449)
[schematron]    at org.apache.tools.ant.Target.performTasks(Target.java:470)
[schematron]    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1391)
[schematron]    at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
[schematron]    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
[schematron]    at org.apache.tools.ant.Project.executeTargets(Project.java:1254)
[schematron]    at org.apache.tools.ant.Main.runBuild(Main.java:830)
[schematron]    at org.apache.tools.ant.Main.startAnt(Main.java:223)
[schematron]    at org.apache.tools.ant.launch.Launcher.run(Launcher.java:284)
[schematron]    at org.apache.tools.ant.launch.Launcher.main(Launcher.java:101)
[schematron] Caused by: Fehler beim Pr³fen des Typs des Ausdrucks "funcall(document-uri, [AbsoluteLocationPath(null)])".
[...]
[schematron] [main] WARN com.helger.schematron.xslt.SchematronResourceSCHCache - The Schematron resource 'C:\Users\Nico\Desktop\tests\ant\schematron\ph-schematron-usage\test.sch' is invalid!

BUILD FAILED
C:\Users\Nico\Desktop\tests\ant\schematron\ph-schematron-usage\build.xml:18: Error in Schematron: [error] Transformation error (javax.xml.transform.TransformerException: Stylesheet konnte nicht kompiliert werden)

Total time: 1 second

For some reasons it tries to use the Xalan? (com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl)

If I call the same script with cls && ant -lib=lib1.0 -f build.xml it works:

db.common.validation.schematron:
[schematron] Successfully parsed Schematron file 'C:\Users\Nico\Desktop\tests\ant\schematron\ph-schematron-usage\test.sch'
[schematron] Validating XML file 'C:\Users\Nico\Desktop\tests\ant\schematron\ph-schematron-usage\test.xml' against Schematron rules from 'test.sch' expecting success
[schematron] [main] INFO com.helger.jaxb.JAXBContextCache - Creating JAXB context for package org.oclc.purl.dsdl.svrl using ClassLoader java.net.URLClassLoader@4dd8dc3

BUILD FAILED
C:\Users\Nico\Desktop\tests\ant\schematron\ph-schematron-usage\build.xml:18: 1 Schematron error for XML file 'C:\Users\Nico\Desktop\tests\ant\schematron\ph-schematron-usage\test.xml'

Total time: 3 seconds

This leads in my case to nasty nested ant calls in my ant build scripts, because we need a simple ant call on the commandline. It works with such workarounds, but the "Alternative" with the classpath attribute would make it really cool.

Background infos:

• Ant version: Apache Ant(TM) version 1.10.6 compiled on May 2 2019
• Java version: 1.8.0_211
• System: Windows 10

[phax]

Try something like

  <path id="phsch.path">
  	<fileset dir="../../../../target">
  		<include name="*-jar-with-dependencies.jar"/>
    </fileset>
  </path>
  <taskdef name="schematron" classname="com.helger.schematron.ant.Schematron" classpathref="phsch.path" />

I am not an ANT expert :(

[nkutsche]

I am not an ANT expert :(

Me neither. But anything I tried, didn't worked. With path/fileset, taskdef/@classpath, taskdef/classpath, etc. Every time the same result.

And something seems to work, because if I ommit the any classpath reference I get this (for sure):

taskdef class com.helger.schematron.ant.Schematron cannot be found

There is an open stackoverflow question about a very similar error message. Comment from Micheal Kay was:

Well you're definitely running Xalan rather than Saxon.

[phax]

I can reproduce the error. It seems like a problem with created "JAR with dependencies".
Maybe this is because ANT loads Xalan itself as the primary JAXP provider? I am investigating it

[phax]

The reasons seems to be that Thread.currentThead ().getContextClassLoader() is not returning the correct ANT class loader. When passing an explicit classloader to the TransformerFactory the ANTClassLoader is used.

[phax]

This is fixed in the 5.2.0 release

[nkutsche]

It's a pleasure to work with such a well-maintained open source project! It works perfect.

[phax]

A star on the project is always appreciated :)