MessageBodyWriter not found for media type application json

Question

I am facing issues while consuming JAX-RS services as JSON   Below I have added my code   This is my service class     Sets the path to base URL    hello  Path   hello     Consumes MediaType APPLICATION JSON   Produces MediaType APPLICATION JSON  public class Hello         GET      Produces  application json       public Student getStudent              Student s   new Student            s first name    Test First Name               s last name    Test Last Name               return s          Student class which I am trying to get from service    XmlRootElement public class Student implements Serializable        public String first name      public String last name       public String getFirst name             return first name             public void setFirst name String first name            this first name   first name             public String getLast name             return last name             public void setLast name String last name            this last name   last name             public Student                 first name    Fahad           last name    Mullaji             Web XML on service side    lt  xml version  1 0  encoding  UTF-8   gt   lt web-app xmlns xsi  http   www w3 org 2001 XMLSchema-instance      xmlns  http   java sun com xml ns javaee      xsi schemaLocation  http   java sun com xml ns javaee http   java sun com xml ns javaee web-app 3 0 xsd      id  WebApp ID  version  3 0  gt       lt display-name gt com vogella jersey first lt  display-name gt       lt servlet gt           lt servlet-name gt Jersey REST Service lt  servlet-name gt           lt servlet-class gt org glassfish jersey servlet ServletContainer lt  servlet-class gt           lt  -- Register resources and providers under com vogella jersey first package  -- gt           lt init-param gt               lt param-name gt jersey config server provider packages lt  param-name gt               lt param-value gt com vogella jersey first lt  param-value gt           lt  init-param gt           lt init-param gt               lt param-name gt com sun jersey api json POJOMappingFeature lt  param-name gt               lt param-value gt true lt  param-value gt           lt  init-param gt            lt load-on-startup gt 1 lt  load-on-startup gt       lt  servlet gt       lt servlet-mapping gt           lt servlet-name gt Jersey REST Service lt  servlet-name gt           lt url-pattern gt  rest   lt  url-pattern gt       lt  servlet-mapping gt   lt  web-app gt     I don t know how to fix this issue  I am using SOAP UI for testing JSON response but I guess that it should not matter   Many places I read that I need to add the code below  But I don t know where  I am not using Maven for building    lt dependency gt       lt groupId gt org glassfish jersey media lt  groupId gt       lt artifactId gt jersey-media-moxy lt  artifactId gt   lt  dependency gt    Server is looking for function to parse Student object to JSON but it is not able to find function or jar file for it   I have added jar of Genson  Moxy  RESTEasy and Jackson but I think that s the problem  I think I am missing mapping somewhere

User · Answer

I was in the same situation where
- I was not using Maven or Ant,
- I finished this Vogella tutorial on Jersey,
- and I was getting the MessageBodyWriter error when trying to use @Produces(MediaType.APPLICATION_JSON).

This answer by @peeskillet solves the problem - you have to use the Jackson *.jar files that are available from the FasterXML Jackson Download page. You'll need the core files as well as the jaxrs files.

I added them to my WebContent/WEB-INF/lib folder where I have my Jersey *.jar files per the above tutorial, and made the small change to the web.xml file below (again, as originally shared by @peeskillet):

<param-name>jersey.config.server.provider.packages</param-name>
<param-value>
    your.other.package.here, com.fasterxml.jackson.jaxrs.json 
</param-value>

The important part being com.fasterxml.jackson.jaxrs.json.

User · Answer

You ve to create empty constructor because JAX-RS initializes the classes    Your constructor must have no arguments    XmlRootElement public class Student implements Serializable        public String first name      public String last name       public String getFirst name             return first name             public void setFirst name String first name            this first name   first name             public String getLast name             return last name             public void setLast name String last name            this last name   last name             public Student                 first name    Fahad           last name    Mullaji            public Student

User · Answer

I think may be you should try to convert the data to json format  It can be done by using gson lib  Try something like below    I don t know it is a best solutions or not but you could do it this way It worked for me  example       GET  Produces   MediaType APPLICATION XML  MediaType APPLICATION JSON    public Response info  HeaderParam  Accept   String accept        Info information   new Info        information setInfo  Calc Application Info        System out println accept       if   accept equals MediaType APPLICATION JSON             return Response status Status ACCEPTED  entity information  build          else           Gson jsonConverter   new GsonBuilder   create            return Response status Status ACCEPTED  entity jsonConverter toJson information   build

User · Answer

You have to convert the response to JSON using Gson toJson object   For example  return Response status Status OK  entity new Gson   toJson Student   build

User · Answer

Ensure that you have following JARS in place  1  jackson-core-asl-1 9 13 2  jackson-jaxrs-1 9 13 3  jackson-mapper-asl-1 9 13 4  jackson-xc-1 9 13

User · Answer

Uncommenting the below code helped    lt dependency gt       lt groupId gt org glassfish jersey media lt  groupId gt       lt artifactId gt jersey-media-moxy lt  artifactId gt   lt  dependency gt    which was present in pom xml in my maven based project resolved this error for me

User · Answer

To overcome this issue try the following  Worked for me    Add following dependency in the pom xml   lt dependency gt     lt groupId gt org glassfish jersey media lt  groupId gt     lt artifactId gt jersey-media-json-jackson lt  artifactId gt     lt version gt 2 25 lt  version gt   lt  dependency gt    And make sure Model class contains no arg constructor   public Student

User · Answer

Below should be in your pom xml above other jersy jackson dependencies  In my case it as below jersy-client dep-cy and i got MessageBodyWriter not found for media type application json    lt dependency gt     lt groupId gt org glassfish jersey media lt  groupId gt     lt artifactId gt jersey-media-json-jackson lt  artifactId gt     lt version gt 2 25 lt  version gt   lt  dependency gt

User · Answer

I was able to fix it by install jersey-media-json-jackson  Add the dependency to pom xml   lt dependency gt     lt groupId gt org glassfish jersey media lt  groupId gt     lt artifactId gt jersey-media-json-jackson lt  artifactId gt     lt scope gt runtime lt  scope gt   lt  dependency gt

User · Answer

In my experience this error is pretty common  for some reason jersey sometimes has problems parsing custom java types  Usually all you have to do is make sure that you respect the following 3 conditions    you have jersey-media-json-jackson in you pom xml if using maven or added to your build path  you have an empty constructor in the data type you are trying to de- serialize  you have the relevant annotation at the class and field level for your custom data type  xmlelement and or jsonproperty     However  I have ran into cases where this just was not enough  Then you can always wrap you custom data type in a GenericEntity and pass it as such to your ResponseBuilder   GenericEntity lt CustomDataType gt  entity   new GenericEntity lt CustomDataType gt  myObj      return Response status httpCode  entity entity  build      This way you are trying to help jersey to find the proper relevant serialization provider for you object  Well  sometimes this also is not enough  In my case I was trying to produce a text plain from a custom data type  Theoretically jersey should have used the StringMessageProvider  but for some reason that I did not manage to discover it was giving me this error   org glassfish jersey message internal MessageBodyProviderNotFoundException  MessageBodyWriter not found for media type text plain   So what solved the problem for me was to do my own serialization with jackson s writeValueAsString    I m not proud of it but at the end of the day I can deliver an acceptable solution

[java] MessageBodyWriter not found for media type=application/json

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