New to Jackson - XML response problem - Why have multiple nodes with duplicated element names

[o haya]

Hi,

I have just started working with a Spring boot project.  This currently works and supports JSON responses, and I am trying to add support for XML responses.  Being new, it's been a struggle (that is an understatement :)!), but the last problem that I am encountering is that there are 2 situations where there are multiple levels with duplicated element names.  

The responses that I am working with are XACML 2.0 responses, and I think that they generated the model classes with XJC(?) and the XACML 2.0 XSD.  

The "expected" response message is (for example) supposed to look like:

<Response xmlns:ns2="urn:oasis:names:tc:xacml:2.0:policy:schema:os"

          xmlns:ns3="urn:oasis:names:tc:xacml:2.0:context:schema:os">

      <ns3:Result ResourceId="xxxxxxxxxxxxxxxxxxxx">

         <ns3:Decision>Permit</ns3:Decision>

         <ns3:Status>

            <ns3:StatusCode value="urn:oasis:names:tc:xacml:1.0:status:ok"/>

         </ns3:Status>

         <ns2:Obligations>

            <ns2:Obligation FulfillOn="Permit"

                            ObligationId="http://security.bea.com/ssmws/ssm-ws-1.0.wsdl#Roles">

               

                  <ns2:AttributeAssignment AttributeId="http://security.bea.com/ssmws/ssm-ws-1.0.wsdl#role"

                                           DataType="http://www.w3.org/2001/XMLSchema#string">AuthenticatedUser</ns2:AttributeAssignment>

               

            </ns2:Obligation>

            <ns2:Obligation FulfillOn="Permit"

                            ObligationId="http://security.bea.com/ssmws/ssm-ws-1.0.wsdl#ResponseAttributes">

              

                  <ns2:AttributeAssignment AttributeId="http://security.bea.com/ssmws/ssm-ws-1.0.wsdl#decisionTime"

                                           DataType="http://www.w3.org/2001/XMLSchema#dateTime">2021-11-28T18:27:09.800Z</ns2:AttributeAssignment>

               

            </ns2:Obligation>

         </ns2:Obligations>

      </ns3:Result>

</Response>

But, the responses that I actually getting look like the following:

<Response xmlns:ns2="urn:oasis:names:tc:xacml:2.0:policy:schema:os"

          xmlns:ns3="urn:oasis:names:tc:xacml:2.0:context:schema:os">

   <ns3:Result>

      <ns3:Result ResourceId=" xxxxxxxxxxxxxxxxxxxx  ">

         <ns3:Decision>Permit</ns3:Decision>

         <ns3:Status>

            <ns3:StatusCode value="urn:oasis:names:tc:xacml:1.0:status:ok"/>

         </ns3:Status>

         <ns2:Obligations>

            <ns2:Obligation FulfillOn="Permit"

                            ObligationId="http://security.bea.com/ssmws/ssm-ws-1.0.wsdl#Roles">

               <ns2:AttributeAssignment>

                  <ns2:AttributeAssignment AttributeId="http://security.bea.com/ssmws/ssm-ws-1.0.wsdl#role"

                                           DataType="http://www.w3.org/2001/XMLSchema#string">AuthenticatedUser</ns2:AttributeAssignment>

               </ns2:AttributeAssignment>

            </ns2:Obligation>

            <ns2:Obligation FulfillOn="Permit"

                            ObligationId="http://security.bea.com/ssmws/ssm-ws-1.0.wsdl#ResponseAttributes">

               <ns2:AttributeAssignment>

                  <ns2:AttributeAssignment AttributeId="http://security.bea.com/ssmws/ssm-ws-1.0.wsdl#decisionTime"

                                           DataType="http://www.w3.org/2001/XMLSchema#dateTime">2021-11-28T18:27:09.800Z</ns2:AttributeAssignment>

               </ns2:AttributeAssignment>

            </ns2:Obligation>

         </ns2:Obligations>

      </ns3:Result>

   </ns3:Result>

</Response>

Notice that there are 2 levels with <ns3:Result> and also 2 levels with <ns2:AttributeAssignment>?

What kind of scenario might be causing that?

As I mentioned, I am really new to using Jackson, so please let me know what information might help to figure what the problem is?

Thanks,

Jim

[gapag]

Hi Jim,

¶ I guess you need to decorate your data classes with the XML specific @JacksonXmlElementWrapper to get the behaviour you wish.

https://github.com/FasterXML/jackson-dataformat-xml#additional-annotations

¶ If you don't want/cannot decorate the class definition of the objects your are deserializing to, you can properly initialize the ObjectMapper:

https://github.com/FasterXML/jackson-docs/wiki/JacksonMixInAnnotations

BR,

-gapag

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On Tuesday, November 30, 2021 at 1:05:15 AM UTC+1 ohay...gmail.com wrote:

Hi,

I have just started working with a Spring boot project.  This currently works and supports JSON responses, and I am trying to add support for XML responses.  

Thanks,

Jim

[o haya]

Hi gapag,

I didn't show the code, but actually, I already had a @JacksonXmlElementWrapper, but I had the useWrapping set to the wrong value (misunderstood).  I changed it from true to false and that took care of the problem!!

Thanks!

Jim