GWTコンパイル中のNPE

Question

GWTコンパイル中に以下のNPEが表示されます。これは、コンパイラ自体ではなく、アプリケーションコードでは：

[ERROR] Exception in thread "pool-1-thread-96" java.lang.NullPointerException 
[ERROR]  at com.google.gwt.dev.util.DiskCache.transferToStream(DiskCache.java:185) 
[ERROR]  at com.google.gwt.dev.util.DiskCacheToken.writeObject(DiskCacheToken.java:73) 
[ERROR]  at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source) 
[ERROR]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
[ERROR]  at java.lang.reflect.Method.invoke(Method.java:498) 
[ERROR]  at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1028) 
[ERROR]  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) 
[ERROR]  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432) 
[ERROR]  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) 
[ERROR]  at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548) 
[ERROR]  at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:441) 
[ERROR]  at com.google.gwt.dev.javac.CachedCompilationUnit.writeObject(CachedCompilationUnit.java:222) 
[ERROR]  at sun.reflect.GeneratedMethodAccessor33.invoke(Unknown Source) 
[ERROR]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
[ERROR]  at java.lang.reflect.Method.invoke(Method.java:498) 
[ERROR]  at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1028) 
[ERROR]  at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496) 
[ERROR]  at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432) 
[ERROR]  at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178) 
[ERROR]  at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348) 
[ERROR]  at com.google.gwt.dev.javac.PersistentUnitCache$6.run(PersistentUnitCache.java:492) 
[ERROR]  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
[ERROR]  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
[ERROR]  at java.lang.Thread.run(Thread.java:745) 

GWTバージョン2.6.1

Answer 1

このバグ（両方のサーバーとクライアント側で使用）ではないすべての共有クラスがSerializableインタフェースを実装する際に通常起こります。