Attachment sample

[Liu, C.C]

Hi,

I got the following error from Attachment sample client side, can anyone
show me what's the
possible cause of it?
Thanks.

        C.C. Liu

java.lang.NullPointerException
java.lang.NullPointerException
java.lang.NullPointerException
         at
org.apache.axis.encoding.ser.JAFDataHandlerSerializer.serialize(Unknown
Source)
         at
org.apache.axis.encoding.SerializationContextImpl.serializeActual(Unknown
Source)
         at
org.apache.axis.encoding.SerializationContextImpl.serialize(Unknown Source)
         at
org.apache.axis.encoding.SerializationContextImpl.outputMultiRefs(Unknown
Source)
         at org.apache.axis.message.SOAPEnvelope.outputImpl(Unknown Source)
         at org.apache.axis.message.MessageElement.output(Unknown Source)
         at org.apache.axis.SOAPPart.getAsString(Unknown Source)
         at org.apache.axis.SOAPPart.getAsBytes(Unknown Source)
         at org.apache.axis.Message.getContentLength(Unknown Source)
         at org.apache.axis.transport.http.HTTPSender.invoke(Unknown Source)
         at org.apache.axis.strategies.InvocationStrategy.visit(Unknown
Source)
         at org.apache.axis.SimpleChain.doVisiting(Unknown Source)
         at org.apache.axis.SimpleChain.invoke(Unknown Source)
         at org.apache.axis.client.AxisClient.invoke(Unknown Source)
         at org.apache.axis.client.Call.invoke(Unknown Source)
         at org.apache.axis.client.Call.invoke(Unknown Source)
         at org.apache.axis.client.Call.invoke(Unknown Source) 
        at org.apache.axis.client.Call.invoke(Unknown Source) 
        at testEchoAttach.echo(testEchoAttach.java:54)
         at testEchoAttach.main(testEchoAttach.java:201)