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

Wed, 04 Dec 2013 00:32:00 -0800 

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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