Re: [No message body writer has been found for response class] is returned only application/json

[Sergey Beryozkin]

Hi,

On 08/09/12 04:49, ibory0205 wrote:
Sorry not good at English.
I use cxf for the first time.
Refer to the various sample, I tried to create a simple REST web service
with apache cxf.

I succeed when @Produces tag set "application/xml".
but failed when @Produces tag set "application/json" with [No message body
writer has been found for response class Document] message.

result is below
-------------------------------------------------------------------------------------
[when @Produces("application/xml")]
<document>
     <name>aaa</name>
</document>

[when @Produces("application/json")]
No message body writer has been found for response class Document.
-------------------------------------------------------------------------------------

my code is below.
-------------------------------------------------------------------------------------
[Resource Interface class]
@Path("/document")
public interface DocumentResource {
        
        @GET
        @Path("/name/{name}")
        @Produces("application/json")
        Document getDocument(@PathParam("name") String name);

}

[Implement class]
@Component
public class DocumentResourceImpl implements DocumentResource {

        public Document getDocument(String name) {
                Document doc = new Document();
                doc.setName(name);
                return doc;
        }

}

[Document class]
@XmlRootElement
public class Document {
        private String name;
        
        public String getName() {
                return name;
        }
        public void setName(String name) {
                this.name = name;
        }
}

[applicationContext.xml]
<beans ...>

   <import resource="classpath:META-INF/cxf/cxf.xml" />

   <context:component-scan base-package="jp.sample.jaxrs" />

   <jaxrs:server id="documentResource" address="/">
     <jaxrs:serviceBeans>
         <ref bean="documentResourceImpl" />
     </jaxrs:serviceBeans>
   </jaxrs:server>

</beans>

[pom.xml]
<project ...>
   <modelVersion>4.0.0</modelVersion>
   <groupId>jp.example.webapp</groupId>
   <artifactId>jax-rs</artifactId>
   <packaging>war</packaging>
   <version>1.0-SNAPSHOT</version>
   <name>jax-rs Maven Webapp</name>
   <url>http://maven.apache.org</url>
   <dependencies>
       <dependency>
           <groupId>org.apache.cxf</groupId>
           <artifactId>cxf-rt-frontend-jaxrs</artifactId>
           <version>2.6.2</version>
           <type>jar</type>
           <scope>compile</scope>
       </dependency>
       <dependency>
           <groupId>org.apache.cxf</groupId>
           <artifactId>cxf-bundle-jaxrs</artifactId>
           <version>2.6.2</version>
           <type>jar</type>
           <scope>compile</scope>
       </dependency>
       <dependency>
           <groupId>org.springframework</groupId>
           <artifactId>spring-web</artifactId>
           <version>3.0.7.RELEASE</version>
           <type>jar</type>
           <scope>compile</scope>
       </dependency>
   </dependencies>
   <build>
     <finalName>jax-rs</finalName>
   </build>
</project>
-------------------------------------------------------------------------------------

What is the cause of this problem(code? configuration? library?)

The only difference between CXF 2.5.1 and CXF 2.6.2 is that the default 
JSON provider is in the different package in 2.6.2, 
org.apache.cxf.jaxrs.provider.json.JSONProvider.

We have JAXB-to-JSON working in 2.6.2 too, it has to be something with 
the configuration - you already have a Maven based project, can you 
please zip the project and attach to JIRA ? I can have a look then

Thanks, Sergey


Thank you.



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Sergey Beryozkin

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Blog: http://sberyozkin.blogspot.com