RestEasy - Cannot Find MessageBodyReader?

Question

I wrote a simple RestEasy client client to do an iTunes search. It looks like this:

@Path("/") public interface AppleAppStoreLookupClient { /** * Attempts to lookup an apple app store item by its ID * * @param id * The item ID * @return The app details */ @GET @Path("/lookup") @Produces(value = { "text/javascript" }) public AppleAppDetailsResponse lookupByID(@QueryParam("id") String id); } 

My JSON model class is simple. In fact, for the first call, all I need is a "resultCount" value, just to make sure the connection works.

 @XmlRootElement @XmlAccessorType(XmlAccessType.NONE) public class AppleAppDetailsResponse implements Serializable { private static final long serialVersionUID = 8881587082097337598L; @XmlElement private int resultCount = -1; ...getters and setters... } 

However, when I run a simple test, I get the following exception:

 org.jboss.resteasy.client.ClientResponseFailure: Unable to find a MessageBodyReader of content-type text/javascript;charset="utf-8" and type class net.odyssi.mms.appstore.apple.AppleAppDetailsResponse at org.jboss.resteasy.client.core.BaseClientResponse.createResponseFailure(BaseClientResponse.java:523) at org.jboss.resteasy.client.core.BaseClientResponse.createResponseFailure(BaseClientResponse.java:514) at org.jboss.resteasy.client.core.BaseClientResponse.readFrom(BaseClientResponse.java:415) at org.jboss.resteasy.client.core.BaseClientResponse.getEntity(BaseClientResponse.java:377) at org.jboss.resteasy.client.core.BaseClientResponse.getEntity(BaseClientResponse.java:350) at org.jboss.resteasy.client.core.extractors.BodyEntityExtractor.extractEntity(BodyEntityExtractor.java:62) at org.jboss.resteasy.client.core.ClientInvoker.invoke(ClientInvoker.java:126) at org.jboss.resteasy.client.core.ClientProxy.invoke(ClientProxy.java:88) at $Proxy21.lookupByID(Unknown Source) at net.odyssi.mms.appstore.apple.test.AppleAppStoreLookupClientTest.testLookupByID(AppleAppStoreLookupClientTest.java:50) 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:601) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.junit.runners.ParentRunner.run(ParentRunner.java:300) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) 

I am running RestEasy 2.3.6. Any idea what might cause such an error?

Answer 1

Do you have a json provider in your classpath? If you are using maven, try adding this dependency:

  <dependency> <groupId>org.jboss.resteasy</groupId> <artifactId>resteasy-jettison-provider</artifactId> <version>2.3.6.Final</version> </dependency> 

http://docs.jboss.org/resteasy/docs/2.3.6.Final/userguide/html_single/#JAXB_+_JSON_provider

EDIT:

The content type is typically application/json , not text/javascript . I'm not sure why you are using text/javascript ?

In any case, if your endpoint returns only text/javascript , you can always change the Content-Type -header in the interceptor:

 ResteasyProviderFactory factory = new ResteasyProviderFactory(); RegisterBuiltin.register(factory); factory.getClientExecutionInterceptorRegistry().register( new ClientExecutionInterceptor() { @Override public ClientResponse execute(ClientExecutionContext ctx) throws Exception { ClientResponse response = ctx.proceed(); if("text/javascript".equals(response.getHeaders().getFirst(HttpHeaders.CONTENT_TYPE))){ response.getHeaders().putSingle(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON); } return response; } }); ProxyFactory.create(Service.class, URI.create("http://url-to-your-sevice"), new ApacheHttpClient4Executor(), factory);