DOSGI-CXF-JAXRS-JSON: No message body writer has been found for response class ElectriciteitsMeterStand

Wed, 12 Sep 2012 11:17:27 -0700 

Hi,

I'm trying to make a simple example work JAXRS example work, as described 
below, but I do it using CXF-DOSGI.
(on Equinox, using declarative services)

However, no matter how I configure my service, I always get a message:
12-sep-2012 15:27:42 org.apache.cxf.jaxrs.interceptor.JAXRSOutInterceptor 
writeResponseErrorMessage
WARNING: No message body writer has been found for response class 
ElectriciteitsMeterStand.

(class ElectriciteitsMeterStand is a simple POJO that is returned by one of my 
methods, see code below)

There must be something I'm overlooking, could you give any advice to help me 
solve this problem?

Code:
Service declaration in dOSGI:
<?xml version="1.0" encoding="UTF-8"?>
<scr:component xmlns:scr="http://www.osgi.org/xmlns/scr/v1.1.0"; 
immediate="false" name="EenvoudigeMeterOpname">
   <implementation class="projectone.MeterOpnameImpl" />
  
  <property name="service.exported.interfaces" value="*" />
  <!-- property name="service.exported.configs" value="org.apache.cxf.ws" / -->
  <!-- property name="org.apache.cxf.ws.address" 
value="http://localhost:9090/ws/meteropname"; / -->
  <property name="service.exported.configs" value="org.apache.cxf.rs" />
  <property name="org.apache.cxf.rs.provider.expected" value="true" />
  <property name="org.apache.cxf.rs.provider" 
value="org.apache.cxf.jaxrs.provider.JSONProvider" />
  <!-- property name="service.exported.intents" value="HTTP" / -->
  <!-- property name="org.apache.cxf.rs.databinding" value="jaxb" / --> 
  <service>
      <provide interface="projectone.MeterOpname"/>
  </service>

</scr:component>

Service interface:
package projectone;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.xml.bind.annotation.XmlRootElement;

@Path("/rs")
@XmlRootElement
public interface MeterOpname {
        
    /**
     * Returns the gas meter stand
     *
     * @return the gas meter stand
     */
        @GET
        @Path("getgas")
        @Produces({"application/json", "text/xml"})
    public String getGas();
        
    /**
     * Returns the water meter stand
     *
     * @return the water meter stand
     */
        @GET
        @Path("getwater")
        @Produces({"application/json", "text/xml"})
    public String getWater();

    /**
     * Returns the electriciteit meter stand
     *
     * @return the electriciteit meter stand
     */
        @GET
        @Path("getelectriciteit")
        @Produces({"application/json", "text/xml"})
    public ElectriciteitsMeterStand getElectriciteit();

}

Service Implementation:
package projectone;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.xml.bind.annotation.XmlRootElement;

public class MeterOpnameImpl implements MeterOpname {

        public String getGas() {
                return toHtml(currentMethodName(), 10L);
        }

        public String getWater() {
                return toHtml(currentMethodName(), 100L);
        }

        public ElectriciteitsMeterStand getElectriciteit() {
                ElectriciteitsMeterStand result = new 
ElectriciteitsMeterStand();
                result.setDalVerbruik(50L);
                result.setPiekVerbruik(150L);
                return result;
                
        }

        private String toHtml(String title, Long value) {
                return "<html><header></header><body><h1>" + title + "</h1><p>" 
+ value + "</p></body></html>";
        }
        
        private String currentMethodName() {
                StackTraceElement[] stacktrace = 
Thread.currentThread().getStackTrace();
            StackTraceElement e = stacktrace[2];//coz 0th will be getStackTrace 
so 1st
            return e.getMethodName();
        }

}

Return POJO:
package projectone;

import javax.ws.rs.Produces;
import javax.xml.bind.annotation.XmlRootElement;

@Produces({"application/json", "text/xml"})
@XmlRootElement
public class ElectriciteitsMeterStand {

        public ElectriciteitsMeterStand() {
                
        }

        private Long piekVerbruik;
        private Long dalVerbruik;

        public Long getPiekVerbruik() {
                return piekVerbruik;
        }
        public void setPiekVerbruik(Long piekVerbruik) {
                this.piekVerbruik = piekVerbruik;
        }
        public Long getDalVerbruik() {
                return dalVerbruik;
        }
        public void setDalVerbruik(Long dalVerbruik) {
                this.dalVerbruik = dalVerbruik;
        }
        
        
}


Thanks in advance!

kind regards

Koen Van Leuvenhaege

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