gwt test cases failing after migrating to GWT 2.7.0 only when building the project using maven install

Hi,
I migrated the GWT project to GWT 2.7.0 version. After that, when i build the project using -Dmaven.test.skip.exec clean install then build is successful. But when i run clean install then GWT test cases are failing with following exception

initializationError(com.example.ui.client.TestElementsActivity) Time elapsed: 0.001 sec <<< ERROR!
java.lang.IncompatibleClassChangeError: com/google/gwt/dev/javac/BytecodeSignatureMaker$CompileDependencyVisitor
 at com.google.gwt.dev.javac.BytecodeSignatureMaker.visitCompileDependenciesInBytecode(BytecodeSignatureMaker.java:227)
 at com.google.gwt.dev.javac.BytecodeSignatureMaker.getCompileDependencySignature(BytecodeSignatureMaker.java:209)
 at com.google.gwt.dev.javac.CompiledClass.getSignatureHash(CompiledClass.java:166)
 at com.google.gwt.dev.javac.Dependencies$Ref.<init>(Dependencies.java:42)
 at com.google.gwt.dev.javac.Dependencies$Ref.<init>(Dependencies.java:37)
 at com.google.gwt.dev.javac.Dependencies.resolve(Dependencies.java:114)
 at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater.compile(CompilationStateBuilder.java:366)
 at com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:580)
 at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:513)
 at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:499)
 at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:668)
 at com.googlecode.gwt.test.internal.GwtFactory.createCompilationState(GwtFactory.java:146)
 at com.googlecode.gwt.test.internal.GwtFactory.<init>(GwtFactory.java:109)
 at com.googlecode.gwt.test.internal.GwtFactory.initializeIfNeeded(GwtFactory.java:43)
 at com.googlecode.gwt.test.internal.junit.AbstractGwtRunner.<init>(AbstractGwtRunner.java:27)
 at com.googlecode.gwt.test.GwtRunner.<init>(GwtRunner.java:18)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
 at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
 at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
 at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
 at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:31)
 at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:24)
 at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
 at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29)
 at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
 at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)
 at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:262)
 at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:153)
 at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:124)
 at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:200)
 at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:153)
 at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:103

Note:
 -When i run the GWT testcase separately then the test case was successful, but when i run build using clean.install then failing. 
 GWT testcases are written on com.googlecode.gwt.test.GwtTestWithMockito
Please help me in overcoming this issue.

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