Complex Type as prameter

Question

I am exposing session beans as web services. My question is how can I use a
user defined object as a parameter in the client.
The scenario is like this.
I invoke a method on an EJB through Webservice A and and it returns me an
object of type let's say MYType
On the client it will be packageA.generated.MYType (originally on server it
is packageA.MYType)
I want to call another EJB through Web Service B with MYType as parameter.
But it expects the pramaeter type to be
packageB.generated.MyType on the client
Is there way Ican do this automatically rather than me doing a manul
tranlation?
I looked at faq on webservice.bea.com for "How do you use user-defined
complex datatypes as parameters of the method?". It says the following:
A) You need to register your "custom" data types with the typemapper. Your
Main.java class should have some lines in it that look something like these:
TypeMappingRegistry registry = service.getTypeMappingRegistry();
TypeMapping mapping = registry.getTypeMapping(
SOAPConstants.URI_NS_SOAP_ENCODING );
mapping.register( SOAPElement.class,
new
QName("http://localhost:7001/CVCProxy/CVCProxy/WSDL/eVisharad.BEMEE.Client.E
EService.CVCProxy",
"CVCRequestToken" ),
new SOAPElementCodec(),
new SOAPElementCodec()
But is is not clear what to do after that (to map the retunred type to it's
original server side type or another client type). Please help.
Thanks,
Vish

Answer 1

Hi Vish,
I'd say the easiest way to go about this, is to create a "ReuseableTypes" web
service that contains "echo" operations for each reuseable complex type. For
example:
package com.acme.webservices.datatypes;
public MyTypeOne echoMyTypeOn(MyTypeOne mto)
return mto;
public MyTypeTwo echoMyTypeTwo(MyTypeTwo mtt)
return mtt;
The "service implementation" can just be a POJO (plain old Java object). Then
use the <servicegen><service> and <servicegen><client> Ant tasks to do all the
"hard stuff" (i.e. generating type mappings, serializers, deserializers) for you.
Make sure you make the targetNamespace equal to the Java package you want all
the reuseable types to be in. It can start with "http://", but the next part should
match the Java package name you want (i.e. com.acme.webservices, etc). Afterwards,
you can just unzip the client jar that's created to see what the client-side type
mapping needs to looks like. There will be a MyService.xml file in the client
jar that contains this.
Regards,
Mike Wooten
"Vish Magapu" <vm> wrote:
Hi Michael,
Thanks for your response. That is what I want to do: "reuse user-defined
complex types across web services"
I was hoping to use my EJB knowledge and use web services as a transport
in
place of RMI and wanted to avoid lerning about JAX-RPC. It seems I have
to
take a plunge. I will work on you pointer about defining XSD schema.
Please
let me know if you know resources about that.
Vish
"Michael Wooten" <[email protected]> wrote in message
news:[email protected]...
Hi Vish,
If you want to reuse "user-defined" complex types across web services,you
probably
want to define then in a seperate XSD schema, and include this in theweb-services.xml.
Thay way the WSDL will be generated using the same complex types forboth.
I'm
not sure if there is a way to do this without manually editing theweb-services.xml
(the Web Service Deployment Descriptor).
Knowing a little about how to code XML schema from scratch, is a goodand
powerful
thing :-)
Regards,
Mike Wooten
"Vish Magapu" <vm> wrote:
I am exposing session beans as web services. My question is how can
I
use a
user defined object as a parameter in the client.
The scenario is like this.
I invoke a method on an EJB through Webservice A and and it returns
me an
object of type let's say MYType
On the client it will be packageA.generated.MYType (originally onserver
it
is packageA.MYType)
I want to call another EJB through Web Service B with MYType asparameter.
But it expects the pramaeter type to be
packageB.generated.MyType on the client
Is there way Ican do this automatically rather than me doing a manul
tranlation?
I looked at faq on webservice.bea.com for "How do you use user-defined
complex datatypes as parameters of the method?". It says the following:
A) You need to register your "custom" data types with the typemapper.
Your
Main.java class should have some lines in it that look something like
these:
TypeMappingRegistry registry = service.getTypeMappingRegistry();
TypeMapping mapping = registry.getTypeMapping(
SOAPConstants.URI_NS_SOAP_ENCODING );
mapping.register( SOAPElement.class,
new
QName("http://localhost:7001/CVCProxy/CVCProxy/WSDL/eVisharad.BEMEE.Client.
E
EService.CVCProxy",
"CVCRequestToken" ),
new SOAPElementCodec(),
new SOAPElementCodec()
But is is not clear what to do after that (to map the retunred typeto
it's
original server side type or another client type). Please help.
Thanks,
Vish