SEVERE: A message body writer for Java class java.util.ArrayList and MIME media type application/json was not found

Question

I am testing RESTful services and when I execute I am getting exceptions although I have the following jars in my class path(WEB-INF/lib), I am not using Maven and my JDK version is 1.5. Other questions regarding this issue didn't help to resolve the problem.

Code snippet

@GET
@Produces("application/json")    
//@Produces({MediaType.APPLICATION_JSON}) tried this, didn't work either
public List<Emp> getEmployees() {        
    List<Emp> empList = myDAO.getAllEmployees();
    log.info("size   " + empList.size());
    return empList;
}

@XmlRootElement
public class Emp {
......

web.xml

<servlet>
    <servlet-name>Jersey Web Application</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <init-param>
        <param-name>com.sun.jersey.config.property.packages</param-name>
        <param-value>test.employees</param-value>
    </init-param>
    <init-param>
        <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
        <param-value>true</param-value>
    </init-param>
</servlet>

 <servlet-mapping>
    <servlet-name>Jersey Web Application</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>

List of jars

jersey-server-1.2.jar
jersey-core-1.2.jar
jsr311-api-1.1.jar
asm-3.1.jar
jaxb-api-2.0.jar
jaxb-impl-2.0.jar
jackson-xc-1.2.0.jar
jackson-jaxrs-1.2.0.jar
jackson-mapper-asl-1.2.0.jar
jackson-core-asl-1.2.0.jar
jettison-1.2.jar
jersey-client-1.2.jar
jersey-servlet-1.10.jar
jersey-json-1.8.jar

Exception stack

 SEVERE: A message body writer for Java class java.util.ArrayList,
 and Java type java.util.List<test.Emp>, 
 and MIME media type application/json was not found
Nov 21, 2013 11:47:26 AM com.sun.jersey.spi.container.ContainerResponse traceException
SEVERE: Mapped exception to response: 500 (Internal Server Error)

javax.ws.rs.WebApplicationException
    at javax.ws.rs.WebApplicationException.<init>(WebApplicationException.java:97)
    at javax.ws.rs.WebApplicationException.<init>(WebApplicationException.java:55)
    at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:267)
    at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1035)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:947)
    at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:939)
    at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:399)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:478)
    at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:663)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
    at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:719)
    at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:376)
    at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:870)
    at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:451)
    at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:218)
    at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:119)
    at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)
    at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
    at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:230)
    at oracle.oc4j.network.ServerSocketAcceptHandler.access$800(ServerSocketAcceptHandler.java:33)
    at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:831)
    at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
    at java.lang.Thread.run(Thread.java:595)

How can I resolve this issue?

Please update your jersey related jar files to version 1.17. Get the bundle from here https://jersey.java.net/download.html — Ian Lim, Nov 21 '13 at 09:18
Refer [this link][1] which explains the solution of similar type problem. [1]: http://stackoverflow.com/a/13439840/4469988 — Raju Guduri, Feb 03 '15 at 09:50

score 19 · Answer 1 · answered Apr 04 '14 at 03:18

The problem may be how you're trying to return your result. I have seen others write their service-layer code this way too, but Jersey provides a way to do it cleanly and it will support JSON, XML and HTML output which you only need to specify using your @Produces annotation. This is what I do:

import javax.ws.rs.GET;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.GenericEntity;
import javax.ws.rs.core.Response;

@GET
@Produces( MediaType.APPLICATION_JSON )
public Response getEmployees()
{        
    List< Emp >                  matched;
    GenericEntity< List< Emp > > entity;

    matched = myDAO.getAllEmployees();
    entity  = new GenericEntity< List< Emp > >( matched ) { };

    return Response.ok( entity ).build();
}

I'm using the following Jersey libraries:

jersey-core-1.8.jar
jersey-json-1.8.jar
jersey-server-1.8.jar

score 9 · Answer 2 · answered Nov 21 '13 at 15:11

You cannot define the response Xml as List<Emp>, as the JAXB is unable to identify the @XmlRootElement over the java.util.List or java.util.ArrayList class definition.

Ideally, you should have one parent/root element for your collection of Child Elements.

Create one more Class as Employees to contains the Collection of Emp objects as like below and try it.

@GET
@Produces("application/json")    
public Employees getEmployees() {        
    List<Emp> empList = myDAO.getAllEmployees();
    log.info("size   " + empList.size());
    Employees employees = new Employees();
    employees.setEmployeeList(empList);

    return employees;
}

@XmlRootElement(name = "Employees")
public class Employees {

    List<Emp> employeeList;

    //setters and getters goes here
}

@XmlRootElement()
class Emp {
   //fields here
}

Please try this approach, it will work.

I have tried your approach, however still I am having same errors. Same setup of what I already have and same versions of jars. — Jacob, Nov 21 '13 at 16:12

score 7 · Accepted Answer · answered Nov 21 '13 at 13:26

7

Make sure you don't have multiple Jersey versions in your project. From the list you provided there are modules from 3 different versions (1.2, 1.10, 1.8). For some modules Jersey does a check that the version of a module is the same as the version of the core. If it's not then providers of the module (such as MessageBodyReaders, MessageBodyWriters) are not registered in the runtime. This can be problem in your setup - json vs core (1.8 vs 1.2).

answered Nov 21 '13 at 13:26

Michal Gajdos

10,339
2
43
42

Michal regarding the last pont you have mentioned i.e. I tried with `json jersey-json 1.2` and `jersey-core-1.2`, but problem persists. I need to try your first point, however I could find 1.2 version of `jersey-servlet`. I have been trying to resolve this issue since morning, however didn't succeed. – Jacob Nov 21 '13 at 15:01
And Michal could you be kind enough to suggest what are the correct versions of all jars required to run on JDK1.5? Thanks – Jacob Nov 21 '13 at 15:02
There is no `jersey-servlet` in 1.2 (this module has been introduced ~1.9). All the functionality should be in `jersey-server`. Also I don't think that support for POJO mapping feature (`com.sun.jersey.api.json.POJOMappingFeature`) is in 1.2 which may mean that custom json parser is not able to handle `List`. Can you try to switch to 1.9 at least? – Michal Gajdos Nov 21 '13 at 15:06
So you mean to say I should try `1.9 jersey-server` instead of `1.2`? If so I should iue all `1.9` versions except for `jersey-servlet`? – Jacob Nov 21 '13 at 15:11
I meant to use 1.9 for all Jersey modules (+ you'll be able to use Jackson for Java<->JSON which should be able to handle List). Also the suggestion from @omega may be valid for some JSON parsers. – Michal Gajdos Nov 21 '13 at 15:18
1.9 version is not compatible with JDK1.5 version. – Jacob Nov 21 '13 at 15:36
Michal, as a work around, what I did is avoid using `@Produces("application/json")` and manually wrap json method whatever I return from database and return to REST method call. For this approach my method type is String or Object. E.g. `public String getEmployees() { ...... String myjson = gsons.toJson(empList); return myjson;` Hope this does follows REST standard or architecture. – Jacob Nov 21 '13 at 16:52

score 7 · Answer 4 · answered Oct 22 '15 at 02:29

Add this to your pom.xml. Solved my problem.

        <dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-json</artifactId>
        <version>1.18.1</version>
    </dependency>
    <dependency>
        <groupId>com.owlike</groupId>
        <artifactId>genson</artifactId>
        <version>0.99</version>
    </dependency>

score 3 · Answer 5 · edited Jan 07 '17 at 01:38

3

Specifying @XmlRootElement(name = "yourclass") on the class you want to pass as output. This has solved the problem for me when I get this exception.

edited Jan 07 '17 at 01:38

soundslikeodd

1,078
3
19
32

answered Jan 07 '17 at 00:50

Ramjiraju Kammila

31
1

1

I didn't believe that this might resolve the problem, since the annotation is related to JSON not XML, but it worked!, you made my day, thank you very much – Bassel Kh Nov 28 '17 at 10:19
ditto! what he said! ^ – Victor Ramos Feb 02 '18 at 20:31

padippist · Answer 6 · 2017-12-11T17:56:58.140

I had the same problem.

The thing is it knows how to convert it to xml with the annotation @XmlRootElement but it doesn't know how to convert it to JSON.

So for making it convert everything to JSON with the same annotation of xml(ie @XmlRootElement) we can add

jersey-media-moxy-<whatever version>.jar

or for maven users

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

Also it should have a no argument constructor

score 1 · Answer 7 · edited Dec 16 '17 at 10:18

You have to declare in the servlet container of jersey the param as the following:

'com.sun.jersey.api.json.POJOMappingFeature' like this: 
 <servlet>
    <servlet-name>myServices</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <init-param>
        <param-name>com.sun.jersey.config.property.packages</param-name>
        <param-value>services</param-value>
    </init-param>
    <init-param>
        <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
        <param-value>true</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

score 1 · Answer 8 · answered Sep 26 '18 at 09:22

1

cross check your pojo class may be not done the JAXBinding if not done mark your pojo with @XmlRootElement

answered Sep 26 '18 at 09:22

Niraj singh

11
2

score 1 · Answer 9 · answered Mar 11 '20 at 08:10

I had same problem. Then I solved it.

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>aaa</groupId>
    <artifactId>aaa</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <build>
        <sourceDirectory>src</sourceDirectory>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.0</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>

    </build>
    <dependencies>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-json</artifactId>
            <version>1.18.1</version>
        </dependency>
        <dependency>
            <groupId>com.owlike</groupId>
            <artifactId>genson</artifactId>
            <version>0.99</version>
        </dependency>
        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.7.3</version>
        </dependency>
        <dependency>
            <groupId>jakarta.ws.rs</groupId>
            <artifactId>jakarta.ws.rs-api</artifactId>
            <version>2.1.6</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-bundle</artifactId>
            <version>1.19.4</version>
        </dependency>
    </dependencies>
</project>

My method is here.

public static void postData() {
    Staff staff = new Staff();
    staff.setStaffname("Celal");                staff.setStafflastname("Aygar");
    staff.setEmail("celal.aygar@gmail.com");    staff.setGender("Male");
    staff.setCity("DENIZLI");
    String uri = "http://localhost:8185/staff";
    ClientConfig clientConfig = new DefaultClientConfig();
    clientConfig.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, true);
    Client client = Client.create(clientConfig);
    WebResource resource = client.resource(uri);
    try {
        ClientResponse response = resource.type(MediaType.APPLICATION_JSON).accept(MediaType.APPLICATION_JSON)
                .post(ClientResponse.class, staff);
        if (response.getStatus() == 200) System.out.println("Staff detail : " + response.getEntity(Staff.class));
    } catch (Exception e) { System.out.println("Exception is:" + e.getMessage()); }
}

My entity is here.

@XmlRootElement()
public class Staff {
    private Long staffid;

    private String staffname;
    private String stafflastname;
    private String gender;
    private String email;
    private String city;

    //getter setter toString

}

SEVERE: A message body writer for Java class java.util.ArrayList and MIME media type application/json was not found

9 Answers9

Linked