JAX-RS NoMessageBodyWriterFoundFailure

问题

the method of my jax-rs application:

@GET
@Produces (MediaType.APPLICATION_JSON)
public List <Document> getDocumentList(@HeaderParam("Range") String headerRange) {
int [] range = getRangeFromHeader(headerRange);
return facade.listByRange(range);
}

working properly. But If modifications to the:

@GET
@Produces(MediaType.APPLICATION_JSON)
public Response getDocumentList(@HeaderParam("Range") String headerRange) {
   int[] range = getRangeFromHeader(headerRange);
   return Response.ok(
          facade.listByRange(range))
         .header("Content-Range", getContentRangeStr(range)).build();
}

I receive an error

...NoMessageBodyWriterFoundFailure: Could not find MessageBodyWriter for response
object of type: java.util.ArrayList of media type: application/json...

Server Jboss 7.1.1

Please tell me what's wrong.

PS.sorry for my bad English.

回答1:

The snippet below should do the trick.

@GET
@Produces(MediaType.APPLICATION_JSON)
public Response getDocumentList(@HeaderParam("Range") String headerRange) {
   int[] range = getRangeFromHeader(headerRange);
   return Response.ok(
        new GenericEntity<List<Document>>( (List<Document>)facade.listByRange(range))
         )
         .header("Content-Range", getContentRangeStr(range)).build();
}

The anonymous GenericEntity subclass is required to supply the correct type information (otherwise erased by the compiler) for the writer.

-- EDIT

The reason why your code worked using org.jboss.resteasy.resteasy-jackson-provider but not with org.jboss.resteasy.resteasy-jettison-provider resides on the fundamental difference between the two providers:

the former (jackson) relies on a JavaBean model, discovering the properties of the objects to serialize, and needs no type information
the latter (jettyson) relies on the JAXB annotations, so it needs the underlying type information, erased by the compiler.

回答2:

You're missing a library as described here:

Here is the solution

This means that you are missing a JSON library in your classpath. Jackson is one I’m using so adding this to your pom.xml will help:

<dependency>
    <groupId>org.glassfish.jersey.media</groupId>
    <artifactId>jersey-media-json-jackson</artifactId>
    <version>2.10.1</version>
</dependency>

来源：https://stackoverflow.com/questions/18613031/jax-rs-nomessagebodywriterfoundfailure

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java

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jax-rs

resteasy