Noob Question on UI Binder

Hi,

I recently updated to 2.7 and decided to use UI Binder.  I created a sample as follows:

Login.java

package com.CyberObjects.avnoc.EiS.client.widgets;

import com.google.gwt.core.client.GWT;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Widget;

public class Login extends Composite {

    interface MyUiBinder extends UiBinder<Widget, Login> {
    }

    private static MyUiBinder uiBinder = GWT.create(MyUiBinder.class);

    public Login() {
        // sets listBox
        initWidget(uiBinder.createAndBindUi(this));

    }
}

 Login.ui.xml

<!-- HelloWidgetWorld.ui.xml -->

<ui:UiBinder xmlns:ui='urn:ui:com.google.gwt.uibinder'>
  <ui:style>
    .pretty { background-color: Skyblue; }
  </ui:style>

  <ui:style field='otherStyle'>
    .pretty { background-color: Orange; }
  </ui:style>

  <div class='{style.pretty}'>
    Hello, <span class='{otherStyle.pretty}' ui:field='nameSpan'/>.
  </div>

</ui:UiBinder>

And get the following error during compilation:

Compiling module com.CyberObjects.avnoc.EiS.AVNOCEiS
   [ERROR] An internal compiler exception occurred
com.google.gwt.dev.jjs.InternalCompilerException: Unexpected error during visit.
    at com.google.gwt.dev.jjs.ast.JVisitor.translateException(JVisitor.java:121)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:296)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:285)
    at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:128)
    at com.google.gwt.dev.jjs.ast.JCastOperation.traverse(JCastOperation.java:67)
    at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:381)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:293)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:285)
    at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:128)
    at com.google.gwt.dev.jjs.ast.JDeclarationStatement.traverse(JDeclarationStatement.java:49)
    at com.google.gwt.dev.jjs.ast.JModVisitor$ListContext.traverse(JModVisitor.java:95)
    at com.google.gwt.dev.jjs.ast.JModVisitor.acceptWithInsertRemove(JModVisitor.java:351)
    at com.google.gwt.dev.jjs.ast.JBlock.traverse(JBlock.java:92)
    at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:381)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:293)
    at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:149)
    at com.google.gwt.dev.jjs.ast.JVisitor.accept(JVisitor.java:145)
    at com.google.gwt.dev.jjs.ast.JMethodBody.traverse(JMethodBody.java:83)
    at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:381)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:293)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:285)
    at com.google.gwt.dev.jjs.ast.JMethod.visitChildren(JMethod.java:600)
    at com.google.gwt.dev.jjs.ast.JMethod.traverse(JMethod.java:569)
    at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:381)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:293)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:285)
    at com.google.gwt.dev.jjs.impl.UnifyAst.mainLoop(UnifyAst.java:1505)
    at com.google.gwt.dev.jjs.impl.UnifyAst.exec(UnifyAst.java:870)
    at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$Precompiler.unifyJavaAst(JavaToJavaScriptCompiler.java:1305)
    at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$Precompiler.constructJavaAst(JavaToJavaScriptCompiler.java:1038)
    at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler$Precompiler.precompile(JavaToJavaScriptCompiler.java:954)
    at com.google.gwt.dev.jjs.MonolithicJavaToJavaScriptCompiler.precompile(MonolithicJavaToJavaScriptCompiler.java:303)
    at com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:38)
    at com.google.gwt.dev.Precompile.precompile(Precompile.java:286)
    at com.google.gwt.dev.Precompile.precompile(Precompile.java:229)
    at com.google.gwt.dev.Precompile.precompile(Precompile.java:145)
    at com.google.gwt.dev.Compiler.run(Compiler.java:206)
    at com.google.gwt.dev.Compiler.run(Compiler.java:158)
    at com.google.gwt.dev.Compiler$1.run(Compiler.java:120)
    at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
    at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
    at com.google.gwt.dev.Compiler.main(Compiler.java:127)
Caused by: java.lang.AbstractMethodError: org.apache.xerces.dom.ElementNSImpl.setUserData(Ljava/lang/String;Ljava/lang/Object;Lorg/w3c/dom/UserDataHandler;)Ljava/lang/Object;
    at com.google.gwt.uibinder.rebind.W3cDocumentBuilder.startElement(W3cDocumentBuilder.java:127)
    at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
    at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
    at org.apache.xerces.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
    at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at javax.xml.parsers.SAXParser.parse(SAXParser.java:392)
    at com.google.gwt.uibinder.rebind.W3cDomHelper.documentFor(W3cDomHelper.java:74)
    at com.google.gwt.uibinder.rebind.UiBinderGenerator.getW3cDoc(UiBinderGenerator.java:204)
    at com.google.gwt.uibinder.rebind.UiBinderGenerator.generateOnce(UiBinderGenerator.java:179)
    at com.google.gwt.uibinder.rebind.UiBinderGenerator.generate(UiBinderGenerator.java:127)
    at com.google.gwt.core.ext.IncrementalGenerator.generateNonIncrementally(IncrementalGenerator.java:40)
    at com.google.gwt.dev.javac.StandardGeneratorContext.runGeneratorIncrementally(StandardGeneratorContext.java:760)
    at com.google.gwt.dev.cfg.RuleGenerateWith.realize(RuleGenerateWith.java:160)
    at com.google.gwt.dev.shell.StandardRebindOracle$Rebinder.rebind(StandardRebindOracle.java:79)
    at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:276)
    at com.google.gwt.dev.shell.StandardRebindOracle.rebind(StandardRebindOracle.java:265)
    at com.google.gwt.dev.DistillerRebindPermutationOracle.getAllPossibleRebindAnswers(DistillerRebindPermutationOracle.java:87)
    at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.createStaticRebindExpression(UnifyAst.java:485)
    at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.createRebindExpression(UnifyAst.java:443)
    at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.handleMagicMethodCall(UnifyAst.java:576)
    at com.google.gwt.dev.jjs.impl.UnifyAst$UnifyVisitor.endVisit(UnifyAst.java:306)
    at com.google.gwt.dev.jjs.ast.JMethodCall.traverse(JMethodCall.java:248)
    at com.google.gwt.dev.jjs.ast.JModVisitor.traverse(JModVisitor.java:381)
    at com.google.gwt.dev.jjs.ast.JModVisitor.accept(JModVisitor.java:293)
    ... 40 more
      [ERROR] at Login.java(13): GWT.create(Login$MyUiBinder.class)
         com.google.gwt.dev.jjs.ast.JMethodCall
      [ERROR] at Login.java(13): (Login$MyUiBinder) GWT.create(Login$MyUiBinder.class)
         com.google.gwt.dev.jjs.ast.JCastOperation
      [ERROR] at Login.java(13): static Login$MyUiBinder uiBinder = (Login$MyUiBinder) GWT.create(Login$MyUiBinder.class)
         com.google.gwt.dev.jjs.ast.JDeclarationStatement
      [ERROR] at Login.java(8): {
  Composite.$clinit();
  static Login$MyUiBinder uiBinder = (Login$MyUiBinder) GWT.create(Login$MyUiBinder.class);
}
         com.google.gwt.dev.jjs.ast.JBlock
      [ERROR] at Login.java(8): {
  Composite.$clinit();
  static Login$MyUiBinder uiBinder = (Login$MyUiBinder) GWT.create(Login$MyUiBinder.class);
}
         com.google.gwt.dev.jjs.ast.JMethodBody
      [ERROR] at Login.java(8): private static final void $clinit();

         com.google.gwt.dev.jjs.ast.JMethod

My class path includes xerces.  Could this be what is causing the error?

Regards,

Ed

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