Compiler exception occured. Not able to compile GWT application

[Raghul]

I getting the following error while compiling the GWT application.

Any one please help resolve this issue.

Validating newly compiled units
   Ignored 3 units with compilation errors in first pass.
Compile with -strict or with -logLevel set to TRACE or DEBUG to see
all errors.
[ERROR] An internal compiler exception occurred
com.google.gwt.dev.jjs.InternalCompilerException: Failed to get JNode
        at com.google.gwt.dev.jjs.impl.TypeMap.get(TypeMap.java:140)
        at com.google.gwt.dev.jjs.impl.TypeMap.get(TypeMap.java:71)
        at com.google.gwt.dev.jjs.impl.BuildTypeMap.getType(BuildTypeMap.java:
730)
        at
com.google.gwt.dev.jjs.impl.BuildTypeMap.createField(BuildTypeMap.java:
570)
        at com.google.gwt.dev.jjs.impl.BuildTypeMap.access
$300(BuildTypeMap.java:99)
        at com.google.gwt.dev.jjs.impl.BuildTypeMap
$BuildDeclMapVisitor.visit(BuildTypeMap.java:180)
        at
org.eclipse.jdt.internal.compiler.ast.FieldDeclaration.traverse(FieldDeclaration.java:
285)
        at
org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:
1232)
        at
org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.traverse(CompilationUnitDeclaration.java:
687)
        at
com.google.gwt.dev.jjs.impl.BuildTypeMap.createPeersForNonTypeDecls(BuildTypeMap.java:
637)
        at com.google.gwt.dev.jjs.impl.BuildTypeMap.exec(BuildTypeMap.java:
514)
        at com.google.gwt.dev.jjs.impl.BuildTypeMap.exec(BuildTypeMap.java:
523)
        at
com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile(JavaToJavaScriptCompiler.java:
599)
        at
com.google.gwt.dev.jjs.JavaScriptCompiler.precompile(JavaScriptCompiler.java:
33)
        at com.google.gwt.dev.Precompile.validate(Precompile.java:187)
        at com.google.gwt.dev.Compiler.run(Compiler.java:222)
        at com.google.gwt.dev.Compiler.run(Compiler.java:198)
        at com.google.gwt.dev.Compiler$1.run(Compiler.java:170)
        at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:
88)
        at
com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:
82)
        at com.google.gwt.dev.Compiler.main(Compiler.java:177)
   [ERROR] <no source info>: public class com.gwt.demo.User     extends
java.lang.Object
/*   fields   */
private [unresolved] java.lang.String firstName
private [unresolved] java.lang.String lastName
/*   methods   */
public void <init>(java.lang.String, java.lang.String) throws
java.lang.Exception
[unresolved] public void setLastName(java.lang.String)
[unresolved] private void getLastName() throws java.lang.Exception



      org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding
   [ERROR] at LoginDemo.java(18): public User user = null;
      org.eclipse.jdt.internal.compiler.ast.FieldDeclaration

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