GWT Maven Install compile error java.lang.NullPointerException at com.google.gwt.dev.util.DiskCache.transferToStream(DiskCache.java:187)

I am having this error. tried all the option to delete gwt cache, temp folder, etc from online. but still no luck

Please help..

[ERROR] Exception in thread "pool-1-thread-323" java.lang.NullPointerException

[ERROR]       at com.google.gwt.dev.util.DiskCache.transferToStream(DiskCache.java:187)

[ERROR]       at com.google.gwt.dev.util.DiskCacheToken.writeObject(DiskCacheToken.java:91)

[ERROR]       at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)

[ERROR]       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

[ERROR]       at java.lang.reflect.Method.invoke(Method.java:597)

[ERROR]       at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:940)

[ERROR]       at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)

[ERROR]       at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)

[ERROR]       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)

[ERROR]       at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)

[ERROR]       at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:422)

[ERROR]       at com.google.gwt.dev.javac.CachedCompilationUnit.writeObject(CachedCompilationUnit.java:222)

[ERROR]       at sun.reflect.GeneratedMethodAccessor27.invoke(Unknown Source)

[ERROR]       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

[ERROR]       at java.lang.reflect.Method.invoke(Method.java:597)

[ERROR]       at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:940)

[ERROR]       at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)

[ERROR]       at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)

[ERROR]       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)

[ERROR]       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)

[ERROR]       at com.google.gwt.dev.javac.PersistentUnitCache$6.run(PersistentUnitCache.java:446)

[ERROR]       at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)

[ERROR]       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)

[ERROR]       at java.lang.Thread.run(Thread.java:662)

[ERROR] Exception in thread "pool-1-thread-322" java.lang.NullPointerException

[ERROR]       at com.google.gwt.dev.util.DiskCache.transferToStream(DiskCache.java:187)

[ERROR]       at com.google.gwt.dev.util.DiskCacheToken.writeObject(DiskCacheToken.java:91)

[ERROR]       at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)

[ERROR]       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

[ERROR]       at java.lang.reflect.Method.invoke(Method.java:597)

[ERROR]       at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:940)

[ERROR]       at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)

[ERROR]       at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)

[ERROR]       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)

[ERROR]       at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)

[ERROR]       at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:422)

[ERROR]       at com.google.gwt.dev.javac.CachedCompilationUnit.writeObject(CachedCompilationUnit.java:222)

[ERROR]       at sun.reflect.GeneratedMethodAccessor27.invoke(Unknown Source)

[ERROR]       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

[ERROR]       at java.lang.reflect.Method.invoke(Method.java:597)

[ERROR]       at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:940)

[ERROR]       at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)

[ERROR]       at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)

[ERROR]       at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)

[ERROR]       at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)

[ERROR]       at com.google.gwt.dev.javac.PersistentUnitCache$6.run(PersistentUnitCache.java:446)

[ERROR]       at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)

[ERROR]       at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)

[ERROR]       at java.lang.Thread.run(Thread.java:662)

[ERROR] Exception in thread "pool-1-thread-321" java.lang.NullPointerException

[ERROR]       at com.google.gwt.dev.util.DiskCache.transferToStream(DiskCache.java:187)

[ERROR]       at com.google.gwt.dev.util.DiskCacheToken.writeObject(DiskCacheToken.java:91)

[ERROR]       at sun.reflect.GeneratedMethodAccessor25.invoke(Unknown Source)

[ERROR]       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

[ERROR]       at java.lang.reflect.Method.invoke(Method.java:597)

[ERROR]       at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:940)

Is the below build tag correct from POM file. I am also using smartgwt in the dependency.

 <build>

    <!-- Generate compiled stuff in the folder used for developing mode -->

    <outputDirectory>${webappDirectory}/WEB-INF/classes</outputDirectory>

    <plugins>

      <!-- GWT Maven Plugin -->

      <plugin>

        <groupId>org.codehaus.mojo</groupId>

        <artifactId>gwt-maven-plugin</artifactId>

        <version>2.5.1</version>

        <executions>

          <execution> 

            <goals>

              <goal>compile</goal>

            </goals>

          </execution>

        </executions>

        <!-- Plugin configuration. There are many available options, see 

          gwt-maven-plugin documentation at codehaus.org -->

        <configuration>

           <runTarget>index.html</runTarget>

          <hostedWebapp>${webappDirectory}</hostedWebapp>

           <extraJvmArgs>-Xms128m -Xss1M -Xmx512m</extraJvmArgs>

        </configuration>

      </plugin>

      <!-- Copy static web files before executing gwt:run -->

      <plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <artifactId>maven-war-plugin</artifactId>

        <version>2.1.1</version>

        <executions>

          <execution>

            <phase>compile</phase>

          </execution>

        </executions>

        <configuration>

          <webappDirectory>${webappDirectory}</webappDirectory>

        </configuration>

      </plugin>

      <plugin>

        <groupId>org.apache.maven.plugins</groupId>

        <artifactId>maven-compiler-plugin</artifactId>

        <version>2.3.2</version>

        <configuration>

          <source>1.6</source>

          <target>1.6</target>

        </configuration>

      </plugin>

    </plugins>

  </build>

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