Gwt 2.8.2 compilation error

Hi ,

I am new to gWT. we are upgrading our application to GWT 2.8.2 and sencha GXT 4.0.3

My application is throwing below error . could you please assist 

[INFO] Compiling module au.gov.nsw.rta.cl2.CrashLink2

[INFO]    Ignored 15 units with compilation errors in first pass.

[INFO] Compile with -strict or with -logLevel set to TRACE or DEBUG to see all errors.

[INFO] [ERROR] Unexpected internal compiler error

[INFO] java.lang.NullPointerException

[INFO]  at com.google.gwt.dev.javac.asm.ResolveTypeSignature.mergeTypeParamBounds(ResolveTypeSignature.java:221)

[INFO]  at com.google.gwt.dev.javac.asm.ResolveTypeSignature.resolveGeneric(ResolveTypeSignature.java:291)

[INFO]  at com.google.gwt.dev.javac.asm.ResolveTypeSignature.resolveGeneric(ResolveTypeSignature.java:288)

[INFO]  at com.google.gwt.dev.javac.asm.ResolveTypeSignature.resolveGenerics(ResolveTypeSignature.java:330)

[INFO]  at com.google.gwt.dev.javac.asm.ResolveTypeSignature.visitEnd(ResolveTypeSignature.java:146)

[INFO]  at org.objectweb.asm.signature.SignatureReader.a(Unknown Source)

[INFO]  at org.objectweb.asm.signature.SignatureReader.a(Unknown Source)

[INFO]  at org.objectweb.asm.signature.SignatureReader.accept(Unknown Source)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater.resolveMethod(CompilationUnitTypeOracleUpdater.java:1151)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater.resolveClass(CompilationUnitTypeOracleUpdater.java:944)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater.access$700(CompilationUnitTypeOracleUpdater.java:82)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater$CompilationUnitTypeOracleResolver.resolveClass(CompilationUnitTypeOracleUpdater.java:187)

[INFO]  at com.google.gwt.dev.javac.asm.ResolveTypeSignature.visitClassType(ResolveTypeSignature.java:133)

[INFO]  at org.objectweb.asm.signature.SignatureReader.a(Unknown Source)

[INFO]  at org.objectweb.asm.signature.SignatureReader.accept(Unknown Source)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater.resolveClass(CompilationUnitTypeOracleUpdater.java:896)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater.access$700(CompilationUnitTypeOracleUpdater.java:82)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater$CompilationUnitTypeOracleResolver.resolveClass(CompilationUnitTypeOracleUpdater.java:187)

[INFO]  at com.google.gwt.dev.javac.asm.ResolveTypeSignature.visitClassType(ResolveTypeSignature.java:133)

[INFO]  at org.objectweb.asm.signature.SignatureReader.a(Unknown Source)

[INFO]  at org.objectweb.asm.signature.SignatureReader.a(Unknown Source)

[INFO]  at org.objectweb.asm.signature.SignatureReader.accept(Unknown Source)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater.resolveMethod(CompilationUnitTypeOracleUpdater.java:1151)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater.resolveClass(CompilationUnitTypeOracleUpdater.java:944)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater.addNewTypesDontIndex(CompilationUnitTypeOracleUpdater.java:415)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater.addNewTypesDontIndex(CompilationUnitTypeOracleUpdater.java:493)

[INFO]  at com.google.gwt.dev.javac.CompilationUnitTypeOracleUpdater.addNewUnits(CompilationUnitTypeOracleUpdater.java:456)

[INFO]  at com.google.gwt.dev.javac.CompilationState.assimilateUnits(CompilationState.java:251)

[INFO]  at com.google.gwt.dev.javac.CompilationState.<init>(CompilationState.java:111)

[INFO]  at com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:556)

[INFO]  at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:479)

[INFO]  at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:465)

[INFO]  at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:423)

[INFO]  at com.google.gwt.dev.Precompile.precompile(Precompile.java:222)

[INFO]  at com.google.gwt.dev.Precompile.precompile(Precompile.java:202)

[INFO]  at com.google.gwt.dev.Precompile.precompile(Precompile.java:143)

[INFO]  at com.google.gwt.dev.Compiler.compile(Compiler.java:204)

[INFO]  at com.google.gwt.dev.Compiler.compile(Compiler.java:155)

[INFO]  at com.google.gwt.dev.Compiler.compile(Compiler.java:144)

[INFO]  at com.google.gwt.dev.Compiler$1.run(Compiler.java:118)

[INFO]  at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)

[INFO]  at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)

[INFO]  at com.google.gwt.dev.Compiler.main(Compiler.java:125)

[INFO] ------------------------------------------------------------------------

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