xerces

[Adam Hardy]

Hi again All,

I posted 24 hours ago (included below) about a problem with xerces. 

I probably should have kept it short and sweet to attract a reply, so
I'm going to try that now:

how can I set up and run a task as a goal with a later version of xerces
xml parser?

None of the solutions out in doc/google-land have worked for me, e.g.
forking, defining classpaths etc.


Thanks for any advice,

Adam





-----Original Message-----
From: Adam Hardy 
Sent: 24 February 2005 13:03
To: users@maven.apache.org
Subject: xercesImpl and alternately XmlChars or OutputFormat




I have a problem setting up Sun's JAXB xml binding as an ant task in my
maven.xml.

I have scoured google, the mailing list archives and the maven
documentation, and now after 2 days I think I need some outside help! 

I already found that some people set up a maven plugin for JAXB, which I
tried, but I get the same failure.

In my goal I have declared the JAXB task that I wish to run and have
tried various combinations of classpaths which result in various
NoClassDefFoundError being thrown.

I see there have been problems before with xerces because of maven's
in-built dependence on xerces 2.x. 

For JAXB 1.5 I need to use xercesImpl-2.6.2

>From the mailing list messages on the subject, I think I need maven to
give me a context without any reference to its own version of xerces. 

I tried including fork="true", and referencing classpath declarations
for the ant:taskdef, but I still get the NoClassDefFoundError for the
xercesImpl class:

java.lang.NoClassDefFoundError:
com/sun/org/apache/xml/internal/serialize/OutputFormat

This is my maven.xml:


<goal name="jaxb"> 
  <!--  define an jaxb xjc task to generate schema-based .java files -->

  <ant:taskdef name="xjc" 
    classname="com.sun.tools.xjc.XJCTask" fork="true">
    <ant:classpath>
      <ant:pathelement 
        location="${pom.getDependencyPath('jaxb:jaxb-xjc')}"/>
      <ant:pathelement 
        location="${pom.getDependencyPath('jaxb:jaxb-libs')}"/>
      <ant:pathelement 
        location="${pom.getDependencyPath('jaxb:jaxb-impl')}"/>
      <ant:pathelement 
        location="${pom.getDependencyPath('xsdlib:xsdlib')}"/>
      <ant:pathelement 
        location="${pom.getDependencyPath('relaxng:relaxngDatatype')}"/>
      <ant:pathelement 
        location="${pom.getDependencyPath('namespace:jax-qname')}"/>
      <ant:pathelement 
        location="${pom.getDependencyPath('jaxb:jaxb-api')}"/>
      <ant:pathelement 
        location="${pom.getDependencyPath('namespace:namespace')}"/>
      <ant:pathelement 
        location="${pom.getDependencyPath('xerces:xercesImpl')}"/>
    </ant:classpath>        
  </ant:taskdef>

[snipped out some variable manipulation................]

  <ant:xjc schema="conf/${jaxb.schema}" 
      target="src" 
      package="${jaxb.destination}" fork="true"> 
    <ant:pathelement 
      location="${pom.getDependencyPath('xerces:xercesImpl')}"/>
  </ant:xjc>          

  </goal>


I don't know how to get a context free from references to maven's xerces
version. My attempts have all failed with various results. 

Firstly if I put the xercesImpl jar on the classpath as a pathelement as
above, or if I leave it out, it makes no difference. 

Then if I tell maven to run java:compile first (advice in a msg on the
mailing list) by setting up a preGoal, I get a different error:


java.lang.NoClassDefFoundError: com/sun/xml/util/XmlChars
        at
com.sun.tools.xjc.reader.internalizer.WhitespaceStripper.processPendingT
ext(WhitespaceStripper.java:91)


However XmlChars is in xsdlib.jar, which I have put on the classpath as
you can see above. This is the most confusing bit because it seems a
simple issue, but I can't see what to do.

If I include the whole dependency classpath like this:


<ant:path refid="maven.dependency.classpath"/>


it makes no difference either.

If anyone can provide any advice, I'd be grateful.

Regards
Adam

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