title: ClassCastException in casting DTMManagerDefault into DTMManager during maven jaxb codegen
body: <p>I'm having a strange problem when trying to run a maven build that uses the jaxb2 plugin to do JAXB codegen (see stacktrace below). The best that I can figure is that there's some implementation of DTMManager that's being class loaded from a different JAR than the one in xalan-2.7.1; however, I have verified that the classpath that is used for running the jaxb:generate goal only has the one xalan-2.7.1.jar that contains a DTMManager or a DTMManagerDefault - so I have no clue what else might be getting in the way.</p>
  
  <p>One final data point: our build specifies a 'snapshot' profile, which really only serves to also JAR up the sources (using maven-source-plugin) and publish them as artifacts. The failure scenario I described above <em>only</em> occurs when this profile is specified in addition to the default.</p>
  
  <p>I'm using Maven 2.2.1 running on Sun's 64-bit JDK 1.6.0_21 on Linux x64 (Fedora 13) - see below the stacktrace for the 'mvn -v' info.</p>
  
  <p>Any ideas on what the problem may be and/or how to go about debugging it? This has been causing me grief for the past few days and it's now blocking progress :(</p>
  
  <pre><code>java.lang.ClassCastException: org.apache.xml.dtm.ref.DTMManagerDefault cannot be cast to org.apache.xml.dtm.DTMManager
      at org.apache.xml.dtm.DTMManager.newInstance(DTMManager.java:137)
      at org.apache.xpath.XPathContext.&lt;init&gt;(XPathContext.java:102)
      at org.apache.xpath.jaxp.XPathImpl.eval(XPathImpl.java:207)
      at org.apache.xpath.jaxp.XPathImpl.evaluate(XPathImpl.java:281)
      at com.sun.tools.xjc.reader.internalizer.Internalizer.buildTargetNodeMap(Internalizer.java:224)
      at com.sun.tools.xjc.reader.internalizer.Internalizer.buildTargetNodeMap(Internalizer.java:289)
      at com.sun.tools.xjc.reader.internalizer.Internalizer.transform(Internalizer.java:134)
      at com.sun.tools.xjc.reader.internalizer.Internalizer.transform(Internalizer.java:96)
      at com.sun.tools.xjc.reader.internalizer.DOMForest.transform(DOMForest.java:448)
      at com.sun.tools.xjc.ModelLoader.buildDOMForest(ModelLoader.java:342)
      at com.sun.tools.xjc.ModelLoader.loadXMLSchema(ModelLoader.java:374)
      at com.sun.tools.xjc.ModelLoader.load(ModelLoader.java:167)
      at com.sun.tools.xjc.ModelLoader.load(ModelLoader.java:113)
      at org.jvnet.jaxb2.maven2.XJC2Mojo.runXJC(XJC2Mojo.java:1119)
      at org.jvnet.jaxb2.maven2.XJC2Mojo.execute(XJC2Mojo.java:720)
  ...
  </code></pre>
  
  <p>mvn -v:</p>
  
  <pre><code># mvn -v
  Apache Maven 2.2.1 (r801777; 2009-08-06 14:16:01-0500)
  Java version: 1.6.0_21
  Java home: /usr/java/jdk1.6.0_21/jre
  Default locale: en_US, platform encoding: UTF-8
  OS name: "linux" version: "2.6.33.3-85.fc13.x86_64" arch: "amd64" Family: "unix"
  </code></pre>