Restfull client is not working
My Restfull Service on server works well. I call the service with a form and i get a beautifull response in JSON Format. But if i write a client with a main method for the Service the Client will not work.
Exception on following client code
List<Materialgrundlagen> matList = jsonAnswer.readEntity(new GenericType<List<Materialgrundlagen>>() {});
Exception
MessageBodyReader not found for media type=application/json, type=interface java.util.List, genericType=java.util.List.
I use following components
- Glassfish 4.1.1
- The newest OSGI Bundle from EclipseLink
- Jersy whis is included in Glassfish under modules
This is the form which is working on Browser
<!Doctype html>
<html>
<head>
<title>Read VAN</title>
<meta charset="UTF-8"></meta>
</head>
<body>
<form action="http://hilweb05:8080/RestServiceExample5/matgi/SomeService/" method="POST">
<label for="van">Systembezeichnung:</label>
<input name="van" />
<br/>
<input type="submit" value="Submit" />
</form>
</body>
</html>
This is the data class (JPA Entity and XxmlRootElement)
package de.ml;
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQuery;
import javax.xml.bind.annotation.XmlRootElement;
@Entity
@XmlRootElement
@NamedQuery(name="SomeDataClass.findSome", query="SELECT m FROM SomeDateClass m where m.van like :van")
public class SomeDataClass implements Serializable{
/**
*
*/
private static final long serialVersionUID = -4567908639347398145L;
long f1;
long f2;
String f3;
double f4;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
public long getF1() {
return f1;
}
public void setId(long f1) {
this.f1 = f1;
}
public long getf2() {
return f2;
}
public void setF2(long f2) {
this.f2 = f2;
}
public String getF3() {
return f3;
}
public void setF3(String f3) {
this.van = f4;
}
public double getF4() {
return f4;
}
public void setF4(double f4) {
this.f4 = f4;
}
}
This is the service class
package de.ml;
import java.util.List;
import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;
import javax.persistence.TypedQuery;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.Consumes;
import javax.ws.rs.FormParam;
import javax.ws.rs.GET;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
@Stateless
@LocalBean
@Path("/SomeService")
public class SomeService {
/*
*
* http://localhost:8080/RestServiceExample5/matgi/SomeService/
*/
@PersistenceContext(unitName="somePU",type=PersistenceContextType.TRANSACTION)
EntityManager em;
/**
* Default constructor.
*/
public MatGi2() {
}
/**
* Retrieves representation of an instance of MatGi
*
* @return an instance of String
*/
@POST
@Produces({ MediaType.APPLICATION_JSON })
@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
public List<SomeDataClass> matgiGET(@FormParam("f1") String f1) {
System.out.println("Beginn GET Method.");
List<Materialgrundlagen> list = null;
TypedQuery<Materialgrundlagen> query = em.createNamedQuery("Materialgrundlagen.findSome", Materialgrundlagen.class);
query.setParameter("van", "%" + van + "%");
list= query.getResultList();
System.out.println("End GET Method");
return list;
}
/**
* PUT method for updating or creating an instance of MatGi
*
* @content content representation for the resource
* @return an HTTP response with content of the updated or created resource.
*/
@PUT
@Consumes({ MediaType.APPLICATION_JSON })
public void resourceMethodPUT(SomeDataClass content) {
// TODO Auto-generated method stub
throw new UnsupportedOperationException();
}
}
And know the client that not work
package de.ml.restclient;
import java.util.List;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.WebTarget;
import javax.ws.rs.core.Form;
import javax.ws.rs.core.GenericType;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import org.glassfish.jersey.client.ClientConfig;
public class RestServiceExample5ClientJSON {
public static void main(String[] args) {
ClientConfig config = new ClientConfig();
Client client = ClientBuilder.newClient(config);
WebTarget target = client
.target("http://hilweb05:8080/RestServiceExample5/matgi/SomeService/");
Form form = new Form().param("f1", "value1");
Response jsonAnswer = target.request()
.accept(MediaType.APPLICATION_JSON).post(Entity.form(form));
if (jsonAnswer.getStatus() != 200) {
throw new RuntimeException("Hier laeuft was falsch : "
+ jsonAnswer.getStatus());
}
// Hier steigt er aus ...
List<SomeDataClass> matList = jsonAnswer.readEntity(new GenericType<List<SomeDataClass>>() {});
for (SomeDataClass m : matList) {
System.out.println(m.getF1() + " " + m.getF2() + " "
+ m.getF3());
}
}
}
>() {});