A message body writer for Java type, class net.sf.

问题:

I am using jersey client for making call to rest webservice.

My webservice is consuming the json, so i need to put json in making call to my webservice provider.

I am doing it in below way.

    JSONObject object=new JSONObject();
    object.put("name", employee.getName());
    object.put("empId", employee.getEmpId());
    object.put("organizationName", employee.getOrganizationName());


ClientResponse response = service.path("rest").path("vtn").path("addEmplyee")
            .type(MediaType.APPLICATION_JSON_TYPE).post(ClientResponse.class, object);

but i am getting the below exception:

09:52:01,625 ERROR [[mvc-dispatcher]] Servlet.service() for servlet mvc-dispatcher threw exception com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type, class net.sf.json.JSONObject, and MIME media type, application/json, was not found at com.sun.jersey.api.client.RequestWriter.writeRequestEntity(RequestWriter.java:288) at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke(URLConnectionClientHandler.java:204) at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:147) at com.sun.jersey.api.client.Client.handle(Client.java:648) at com.sun.jersey.api.client.WebResource.handle(WebResource.java:670) at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74) at com.sun.jersey.api.client.WebResource$Builder.post(WebResource.java:563) at com.nec.jp.pflow.unc.service.EmployeeService.addEmployee(EmployeeService.java:44) at com.nec.jp.pflow.unc.controller.EmployeeController.addCustomer(EmployeeController.java:29) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

But if i convert my json to string representation like :

String input = "{\"name\" : \"" + employee.getName() + "\",\"empId\" : \"" + employee.getEmpId() + "\",\"organizationName\" : \"" + employee.getOrganizationName() + "\"}";

ClientResponse response = service.path("rest").path("vtn").path("addEmplyee")
            .type(MediaType.APPLICATION_JSON_TYPE).post(ClientResponse.class, input);

then it is working fine.

Please suggest how can i put my JSON Object without getting the above exception. What is the best way?

Thanks in advance.

---

I got a solution for the above. Now I am making use of jackson-mapper api for converting the POJO to json.

Below is the code snippet.

ObjectMapper mapper = new ObjectMapper();
ClientResponse response = resource.path("rest").path("vtn").path("addEmplyee")
        .type(MediaType.APPLICATION_JSON_TYPE).post(ClientResponse.class, mapper.writeValueAsString(employee)); 

回答1:

A better way is to tell jersey-client that it may use jackson for serialization: https://stackoverflow.com/a/2580315/516188

Pasting the setup:

ClientConfig cc = new DefaultClientConfig();
cc.getClasses().add(JacksonJsonProvider.class);
Client clientWithJacksonSerializer = Client.create(cc);

JacksonJsonProvider is in the jackson-jaxrs-json-provider package.

回答2:

Just copying the solution from the question above, just in case someone is looking for answer.

Use jackson-mapper api for converting the POJO to json as shown in the code snippet below:

ObjectMapper mapper = new ObjectMapper();
ClientResponse response = resource.path("rest").path("vtn").path("addEmplyee")
        .type(MediaType.APPLICATION_JSON_TYPE).post(ClientResponse.class, mapper.writeValueAsString(employee)); 

回答3:

adding a .toString() worked for me:

JSONObject object=new JSONObject();
object.put("name", employee.getName());
object.put("empId", employee.getEmpId());
object.put("organizationName", employee.getOrganizationName());


ClientResponse response = service.path("rest").path("vtn").path("addEmplyee").type(MediaType.APPLICATION_JSON_TYPE).post(ClientResponse.class,object.toString());

回答4:

JSONObject object=new JSONObject();

need to provide @XMLrootElement Annotation....if you are accessing the web service from remote....i.e XML Mapping..for Model class.

回答5:

After lot of reading here is the solution which i arrived at :

If you are using JERSEY-CLIENT as specified as below of version 1.9 or higher

<dependency>
    <groupId>com.sun.jersey</groupId>
    <artifactId>jersey-client</artifactId>
    <version>1.9.1</version>
</dependency>

Then use the MOXY Jar as specified below of version 2.19 or higher

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-moxy</artifactId>
    <version>2.19</version>
</dependency>

And then add the MOXyJsonProvider.class in the Class of Client configuration as shown below :

ClientConfig cc = new DefaultClientConfig();
cc.getClasses().add(MOXyJsonProvider.class);
Client client = Client.create(cc);

Now make the required configuration to Client Object to connect to server and execute the request:

WebResource webResource = client.resource(*restFulPath*);
Builder builder = webResource.accept(MediaType.APPLICATION_JSON);

builder.header("Content-Type", "application/json");
builder.header("Accept ", "application/json");
builder.accept(MediaType.APPLICATION_JSON);

try
{
    String requestData = "*requestInJson*";
    ClientResponse response = null;
    response = builder.post(ClientResponse.class, requestData);
    if (response.getStatus() == 200)
    {
        MappedJsonReportOut res = response.getEntity(MappedJsonReportOut.class);
    }
}

回答6:

You can also use the entity() methods to achieve this, as follows:

    ClientResponse response = resource.path("rest").path("vtn").path("addEmplyee")
    .entity(employee, MediaType.APPLICATION_JSON_TYPE)
    .post(ClientResponse.class);

or

    ClientResponse response = resource.path("rest").path("vtn").path("addEmplyee")
    .type(MediaType.APPLICATION_JSON_TYPE)
    .entity(employee)
    .post(ClientResponse.class); 

回答7:

Error Which m getting is little Bit Different But Finally Solution is Work for Me

   Caused by: com.sun.jersey.api.client.ClientHandlerException: com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type, class com.siemens.spring.model.User, and MIME media type, application/json, was not found
    at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(URLConnectionClientHandler.java:149)
    at com.sun.jersey.api.client.Client.handle(Client.java:648)
    at com.sun.jersey.api.client.WebResource.handle(WebResource.java:670)
    at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74)
    at com.sun.jersey.api.client.WebResource$Builder.post(WebResource.java:563)
    at com.siemens.controller.UserRegistration.process(UserRegistration.java:156)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.el.parser.AstValue.invoke(AstValue.java:278)
    at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)
    at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:153)

And This is Solution Worked for Me :

    Client client = Client.create();
    WebResource webResource = client
            .resource("http://localhost:8080/NewsTickerServices/Siemens/CreateJUser");
    // value added

    ClientResponse response = webResource.type(MediaType.APPLICATION_JSON).post(ClientResponse.class,mapper.writeValueAsString(user));//user is object of User Pojo class