title: Issue using gson with Android in Eclipse
body: <p>when adding gson 1.4 to the java build path of my Android project I get the error shown below.</p>
  
  <p>Anybody can help?</p>
  
  <p>thanks</p>
  
  <pre><code> [2010-05-03 18:42:07 - Atable] 
   UNEXPECTED TOP-LEVEL EXCEPTION:
   java.lang.IllegalArgumentException: already added: Lcom/google/gson/annotations/Expose;
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.dex.file.ClassDefsSection.add(ClassDefsSection.java:123)
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.dex.file.DexFile.add(DexFile.java:143)
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.command.dexer.Main.processClass(Main.java:299)
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.command.dexer.Main.processFileBytes(Main.java:276)
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.command.dexer.Main.access$100(Main.java:56)
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:228)
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:245)
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:130)
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:108)
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.command.dexer.Main.processOne(Main.java:245)
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.command.dexer.Main.processAllFiles(Main.java:183)
   [2010-05-03 18:42:07 - Atable]     at com.android.dx.command.dexer.Main.run(Main.java:139)
   [2010-05-03 18:42:07 - Atable]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   [2010-05-03 18:42:07 - Atable]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   [2010-05-03 18:42:07 - Atable]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   [2010-05-03 18:42:07 - Atable]     at java.lang.reflect.Method.invoke(Method.java:597)
   [2010-05-03 18:42:07 - Atable]     at com.android.ide.eclipse.adt.internal.sdk.DexWrapper.run(Unknown Source)
   [2010-05-03 18:42:07 - Atable]     at com.android.ide.eclipse.adt.internal.build.ApkBuilder.executeDx(Unknown Source)
   [2010-05-03 18:42:07 - Atable]     at com.android.ide.eclipse.adt.internal.build.ApkBuilder.build(Unknown Source)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:627)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
   [2010-05-03 18:42:07 - Atable]     at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
   [2010-05-03 18:42:07 - Atable] 1 error; aborting
   [2010-05-03 18:42:07 - Atable] Conversion to Dalvik format failed with error 1
  </code></pre>