[CAMEL-4014] cxf:rsServer requires class instead of interface in the serviceClass attribute

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.6.0, 2.7.0, 2.7.1
• Fix Version/s: 2.9.3, 2.10.1, 2.11.0
• Component/s: camel-cxf
• Labels: camel cxf jaxrs
• Assignee: Willem Jiang
• Reporter: Sergey Zhemzhitsky
• Created: 26/May/11 07:36
• Updated: 25/Jan/13 07:54
• Resolved: 13/Jul/12 13:12

Description

Here are part of the conversation from the mailing list:

1.

Hi there,

I'm using apache-servicemix-4.3.1-fuse-01-09 and I need to consume RESTful requests.
Here is the documentation I have used: http://camel.apache.org/cxfrs.html
Here is my configuration file

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jaxrs="http://cxf.apache.org/jaxrs"
xmlns:cxf="http://camel.apache.org/schema/cxf"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd
http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd
http://camel.apache.org/schema/cxf http://camel.apache.org/schema/cxf/camel-cxf.xsd
">
<import resource="classpath:META-INF/cxf/cxf.xml" />
<import resource="classpath:META-INF/cxf/cxf-extension-jaxrs-binding.xml" />
<import resource="classpath:META-INF/cxf/cxf-extension-http.xml" />
<import resource="classpath:META-INF/cxf/osgi/cxf-extension-osgi.xml" />

<cxf:rsServer id="myServer" address="/" serviceClass="org.test.MyService" />

<camelContext id="camel" xmlns="http://camel.apache.org/schema/spring">
<route>
<from uri="cxfrs://bean:myServer?exchangePattern=InOut"/>
<transform>
<constant>Hello World!!!</constant>
</transform>
</route>
</camelContext>
</beans>

Here is implementation of org.test.MyService

@Path("/service")
@Produces("application/json")
public class MyService {

@POST
@Path("/resource")
public Response add(@QueryParam("res") String res)

{ return Response.ok(new Status("The Resource has been processed")).build(); }

}

I'm wondering why we have to specify the serviceClass attribute and why this attribute should point at the real class. I'm asking because the response of such a service will always be "Hello World!!!" and implementation of MyService.add method does not matter in that case.

2.

Hi Ben,

You are right, the serviceClass is just used to build up the JAXRS service module. And Camel CXF RS Consumer doesn't all serviceClass instance at the end, it just route the request to the camel route.

3.

Hi Willem, Ben

Thanks for the information.
I tried to use the interface instead of class in the serviceClass attribute and I didn't succeed because of an exception that told that the class is required.
Here is the exception:

Caused by: java.lang.RuntimeException: Resource class interface org.test.MyService has no valid constructor
at org.apache.cxf.jaxrs.lifecycle.PerRequestResourceProvider.<init>(PerRequestResourceProvider.java:45)
at org.apache.cxf.jaxrs.JAXRSServerFactoryBean.updateClassResourceProviders(JAXRSServerFactoryBean.java:338)
at org.apache.cxf.jaxrs.JAXRSServerFactoryBean.create(JAXRSServerFactoryBean.java:119)
... 26 more

I think that using an interface would be better in that case.