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MessageContext question

MessageContext question

2006-05-12 - By Ken Campbell

Back

Reply: 1 2 3 4 5

Hi,

If someone understands the AxisEngine well I'd appreciate them having a look
at this problem:

I'm having a data binding error which I don't understand. In an attempt to
trace it I've called:

System.out.println(msgContext.getEnvelope());

in MyMessageReceiverInOut.invokeBusinessLogic()

This seems to have a very weird effect. By placing it here :

.

if("login".equals(methodName)){

uk.co.edp.ws.paf.LoginResponseDocument param11 = null;

System.out.println(msgContext.getEnvelope());

//doc style

param11 =skel.login(

(uk.co.edp.ws.paf.LoginRequestDocument)fromOM(

msgContext.getEnvelope().getBody().getFirstElement(),

uk.co.edp.ws.paf.LoginRequestDocument.class,

getEnvelopeNamespaces(msgContext.getEnvelope())));

envelope = toEnvelope(getSOAPFactory(msgContext), param11,
false);

System.out.println("toEnvelope() returned.");

.

the service classes will return a valid param11, but axis throws an
exception:

- Servlet.service() for servlet AxisServlet threw exception

java.lang.NullPointerException

Source code of java.lang.NullPointerException

at
com.ctc.wstx.util.BijectiveNsMap.findPrefixByUri(BijectiveNsMap.java:132)

at
com.ctc.wstx.sw.SimpleOutputElement.getPrefix(SimpleOutputElement.java:453)

at
org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serializeAttributes
(StreamingOMSerializer.java:214)

at
org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serializeElement(St
reamingOMSerializer.java:147)

at
org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serializeNode(Strea
mingOMSerializer.java:73)

at
org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serialize(Streaming
OMSerializer.java:56)

at
org.apache.axiom.om.impl.util.OMSerializerUtil.serializeByPullStream(OMSeria
lizerUtil.java:315)

at
org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.
java:786)

at
org.apache.axiom.om.impl.llom.OMElementImpl.internalSerializeAndConsume(OMEl
ementImpl.java:809)

at
org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl.
java:780)

at
org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.internalSerialize(SOAPEnvel
opeImpl.java:171)

at
org.apache.axiom.om.impl.llom.OMElementImpl.internalSerializeAndConsume(OMEl
ementImpl.java:809)

at
org.apache.axiom.om.impl.llom.OMNodeImpl.serializeAndConsume(OMNodeImpl.java
:381)

at
org.apache.axis2.transport.http.CommonsHTTPTransportSender.sendUsingOutputSt
ream(CommonsHTTPTransportSender.java:256)

at
org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke(CommonsHTT
PTransportSender.java:210)

at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:589)

at
org.apache.axis2.receivers.AbstractInOutSyncMessageReceiver.receive(Abstract
InOutSyncMessageReceiver.java:43)

at
org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:454)...

- Servlet.service() for servlet jsp threw exception

java.lang.IllegalStateException

Source code of java.lang.IllegalStateException

: getOutputStream() has already been called
for this response..

So my question is, it seems as if MessageContext.getEnvelope() in some way
'consumes' the data stream. How is it possible

that I am getting a response from my service classes when I do this and that
no other class complains about my intercepting msgContext until

BijectiveNsMap ? The data binding error is normally thrown in
MyMessageReceiverInOut.fromOM() at the request but when I call
msgContext.getEnvelope()

it happily goes off and gets a proper response!

Regards,

Ken

<html>

<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 11 (filtered)">
<style>

</style>

</head>

<body lang=EN-US link=blue vlink=purple>

<div class=Section1>

Hi,

 

If someone understands the AxisEngine well I’d
appreciate them having a look at this problem:

 

I’m having a data binding error which I don&
#8217;t
understand. In an attempt to trace it I’ve called:

System.out.println(msgContext.getEnvelope());

in MyMessageReceiverInOut.invokeBusinessLogic()

 

This seems to have a very weird effect. By placing it
here :

 

…

if("login".equals(methodName)){

 

 

        &nbsp
;  
uk.co.edp.ws.paf.LoginResponseDocument param11 = null;

        &nbsp
;  
System.out.println(msgContext.getEnvelope());


        &nbsp
;  


        &nbsp
;          
//doc style

        &nbsp
;  
 param11 =skel.login(

        &nbsp
;           
(uk.co.edp.ws.paf.LoginRequestDocument)fromOM(

        &nbsp
;             
      
msgContext.getEnvelope().getBody().getFirstElement(),

        &nbsp
;             
      
uk.co.edp.ws.paf.LoginRequestDocument.class,

        &nbsp
;             
     
 getEnvelopeNamespaces(msgContext.getEnvelope())));

        &nbsp
;             
 


        &nbsp
;   
 envelope = toEnvelope(getSOAPFactory(msgContext), param11, false);


        &nbsp
;    
System.out.println("toEnvelope() returned.");

…

 

 

the service classes will return a valid param11, but
axis
throws an exception:

 

- Servlet.service() for servlet AxisServlet threw
exception

java.lang.NullPointerException

&nbsp
;   at
com.ctc.wstx.util.BijectiveNsMap.findPrefixByUri(BijectiveNsMap.java:132)

        &nbsp
;   at
com.ctc.wstx.sw.SimpleOutputElement.getPrefix(SimpleOutputElement.java:453)

        &nbsp
;   at
org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serializeAttributes
(StreamingOMSerializer.java:214)

        &nbsp
;   at
org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serializeElement
(StreamingOMSerializer.java:147)

        &nbsp
;   at
org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serializeNode
(StreamingOMSerializer.java:73)

        &nbsp
;   at
org.apache.axiom.om.impl.serialize.StreamingOMSerializer.serialize
(StreamingOMSerializer.java:56)

        &nbsp
;   at
org.apache.axiom.om.impl.util.OMSerializerUtil.serializeByPullStream
(OMSerializerUtil.java:315)

        &nbsp
;   at
org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl
.java:786)

        &nbsp
;   at
org.apache.axiom.om.impl.llom.OMElementImpl.internalSerializeAndConsume
(OMElementImpl.java:809)

        &nbsp
;   at
org.apache.axiom.om.impl.llom.OMElementImpl.internalSerialize(OMElementImpl
.java:780)

        &nbsp
;   at
org.apache.axiom.soap.impl.llom.SOAPEnvelopeImpl.internalSerialize
(SOAPEnvelopeImpl.java:171)

        &nbsp
;   at
org.apache.axiom.om.impl.llom.OMElementImpl.internalSerializeAndConsume
(OMElementImpl.java:809)

        &nbsp
;   at
org.apache.axiom.om.impl.llom.OMNodeImpl.serializeAndConsume(OMNodeImpl.java
:381)

        &nbsp
;   at
org.apache.axis2.transport.http.CommonsHTTPTransportSender
.sendUsingOutputStream(CommonsHTTPTransportSender.java:256)

        &nbsp
;   at
org.apache.axis2.transport.http.CommonsHTTPTransportSender.invoke
(CommonsHTTPTransportSender.java:210)

        &nbsp
;   at
org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:589)

        &nbsp
;   at
org.apache.axis2.receivers.AbstractInOutSyncMessageReceiver.receive
(AbstractInOutSyncMessageReceiver.java:43)

        &nbsp
;   at
org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:454)…..


- Servlet.service() for servlet jsp threw exception

java.lang.IllegalStateException

: getOutputStream()
has already been called for this response….

 

So my question is, it seems as if
MessageContext.getEnvelope() in some way ‘consumes’ the data stream.
How is it possible

that I am getting a response from my service classes
when
I do this and that no other class complains about my intercepting msgContext
until

BijectiveNsMap ? The data binding error is normally
thrown in MyMessageReceiverInOut.fromOM() at the request but when I call msgContext.getEnvelope()


it happily goes off and gets a proper response!

 

Regards,

Ken

 

</div>

</body>

</html>