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java.io.NotSerializableException: java.io.StringWriter	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:860)	at org.jboss.marshalling.river.BlockMarshaller.doWriteObject(BlockMarshaller.java:65)	at org.jboss.marshalling.river.BlockMarshaller.writeObject(BlockMarshaller.java:56)	at org.jboss.marshalling.MarshallerObjectOutputStream.writeObjectOverride(MarshallerObjectOutputStream.java:50)	at org.jboss.marshalling.river.RiverObjectOutputStream.writeObjectOverride(RiverObjectOutputStream.java:179)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:344)	at java.util.HashMap.internalWriteEntries(HashMap.java:1777)	at java.util.HashMap.writeObject(HashMap.java:1354)	at sun.reflect.GeneratedMethodAccessor28.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)