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java.lang.NullPointerException: 	at com.sun.xml.rpc.sp.NamespaceSupport$Context.declarePrefix(NamespaceSupport.java:538)	at com.sun.xml.rpc.sp.NamespaceSupport.declarePrefix(NamespaceSupport.java:268)	at com.sun.xml.rpc.streaming.XMLWriterImpl.writeNamespaceDeclaration(XMLWriterImpl.java:138)	at com.sun.xml.rpc.encoding.literal.LiteralFragmentSerializer.internalSerialize(LiteralFragmentSerializer.java:135)	at com.sun.xml.rpc.encoding.literal.LiteralObjectSerializerBase.serialize(LiteralObjectSerializerBase.java:107)	at com.sun.xml.rpc.encoding.literal.LiteralRequestSerializer.doSerializeInstance(LiteralRequestSerializer.java:344)	at com.sun.xml.rpc.encoding.literal.LiteralRequestSerializer.doSerialize(LiteralRequestSerializer.java:408)	at com.sun.xml.rpc.encoding.literal.LiteralRequestSerializer.internalSerialize(LiteralRequestSerializer.java:305)	at com.sun.xml.rpc.encoding.literal.LiteralRequestSerializer.serialize(LiteralRequestSerializer.java:262)	at com.sun.xml.rpc.client.StreamingSender._writeRequest(StreamingSender.java:650)	at com.sun.xml.rpc.client.StreamingSender._send(StreamingSender.java:87)	at com.sun.xml.rpc.client.dii.CallInvokerImpl.doInvoke(CallInvokerImpl.java:103)	at com.sun.xml.rpc.client.dii.BasicCall.invoke(BasicCall.java:480)	at com.sun.xml.rpc.client.dii.CallInvocationHandler.doCall(CallInvocationHandler.java:121)	at com.sun.xml.rpc.client.dii.CallInvocationHandler.invoke(CallInvocationHandler.java:85)	at $Proxy0.doService(Unknown Source)