[Axis2] JSON service

[Lawrence Mandel <lm...@ca.ibm.com>]

Hi all,

A few days ago I asked about some trouble I'm having getting a JSON 
response from an Axis2 service. (See below.) I didn't get any responses so 
thought I'd try a different approach. Does anyone have an example of an 
Axis2 service that returns JSON?

Thanks,

Lawrence




Lawrence Mandel/Toronto/IBM@IBMCA 
04/25/2007 06:23 PM
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Subject
[Axis2] Trouble getting JSON response






I've just picked up the latest Axis2 build (from 20070425) and am having 
trouble getting JSON and SOAP responses from the sample Version service. 
Really I think the problem is I just don't understand if Axis2 can do what 

I'd like it to do. The online documentation and googling for an answer 
(which revealed an interesting doc at WSO2) hasn't resulted in an answer.

I'd like to return one of the following depending on the content type 
specified on the request:
1. Plain XML
2. XML wrapped in a SOAP envelope
3. JSON

I specified messageformatters and messagebuilders as follows:

<messageFormatters>
  <messageFormatter contentType="application/x-www-form-urlencoded"
                    class=
"org.apache.axis2.transport.http.XFormURLEncodedFormatter"/>
  <messageFormatter contentType="multipart/form-data"
                    class=
"org.apache.axis2.transport.http.MultipartFormDataFormatter"/>
  <messageFormatter contentType="application/xml"
                    class=
"org.apache.axis2.transport.http.ApplicationXMLFormatter"/>
  <messageFormatter contentType="text/javascript"
                    class="org.apache.axis2.json.JSONMessageFormatter"/>
</messageFormatters>

<messageBuilders>
  <messageBuilder contentType="application/xml"
                  class="org.apache.axis2.builder.ApplicationXMLBuilder"/>
  <messageBuilder contentType="application/x-www-form-urlencoded"
                  class="org.apache.axis2.builder.XFormURLEncodedBuilder"
/>
  <messageBuilder contentType="multipart/form-data"
                  class=
"org.apache.axis2.builder.MultipartFormDataBuilder"/>
  <messageBuilder contentType="text/javascript"
                  class="org.apache.axis2.json.JSONOMBuilder"/>
</messageBuilders>

The rest of my axis2.xml file has not been modified. When I make a request 

to 

http://localhost:8080/axis2/services/Version/getVersion

I get the following response:

<ns:getVersionResponse xmlns:ns="http://axisversion.sample/xsd">
  <ns:return>Hello I am Axis2 version service , My version is 
1.2-SNAPSHOT</ns:return>
</ns:getVersionResponse>

Good. When I change the content type in the header to text/javascript 
(Content-Type: text/javascript) I get the following error (formatted for 
readability here):

type: Exception report
message 
description The server encountered an internal error () that prevented it 
from fulfilling this request.
exception 
java.lang.NullPointerException
 
org.apache.axis2.json.JSONOMBuilder.processDocument(JSONOMBuilder.java:49)
 
org.apache.axis2.transport.TransportUtils.createSOAPMessage(TransportUtils.java:130)
 
org.apache.axis2.transport.http.util.RESTUtil.processURLRequest(RESTUtil.java:98)
 
org.apache.axis2.transport.http.AxisServlet$ProcessRESTRequest.processURLRequest(AxisServlet.java:767)
 org.apache.axis2.transport.http.AxisServlet.doGet(AxisServlet.java:238)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache 
Tomcat/5.0.28 logs.
As for SOAP, I'm not sure what exactly I have to do to get a SOAP 
response. I tried setting the SOAPAction header (I read this somewhere) 
but that didn't help.
Suggestions? Pointers to docs? Have I configured Axis2 correctly? Is this 
type of configuration known to work?

Thanks,

Lawrence 

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