Dealing With MessageException on Jersey Server
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Join For FreeI’ve been reacquainted with my good friend Jersey over the last couple of days and in getting up and running was reminded that things which seemed easy at the time aren’t as easy when starting from scratch.
I eventually settled on using Sunny Gleason‘s j4-minimal repository which wires up Jersey with Jackson, Guice and Jetty which seemed like a good place to start.
I prefer building up JSON objects explicitly rather than setting up automatic mapping so the first thing I did was change the JacksonResource to have an end point that returned a manually built up JSON object:
@Path("/jackson")
public class JacksonResource {
@GET
@Produces( { MediaType.APPLICATION_JSON })
@Path("/awesome/{who}")
public Response sayOtherGreeting(@PathParam("who") String name) {
ObjectNode result = JsonNodeFactory.instance.objectNode();
result.put("name", name);
return Response.ok().entity(result).build();
}
}
When I tried to hit that in the browser I ended up with the following exception:
SEVERE: The registered message body writers compatible with the MIME media type are: application/json -> com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$App com.sun.jersey.json.impl.provider.entity.JSONArrayProvider$App com.sun.jersey.json.impl.provider.entity.JSONObjectProvider$App com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$App com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$App */* -> com.sun.jersey.core.impl.provider.entity.FormProvider com.sun.jersey.server.impl.template.ViewableMessageBodyWriter com.sun.jersey.core.impl.provider.entity.StringProvider com.sun.jersey.core.impl.provider.entity.ByteArrayProvider com.sun.jersey.core.impl.provider.entity.FileProvider com.sun.jersey.core.impl.provider.entity.InputStreamProvider com.sun.jersey.core.impl.provider.entity.DataSourceProvider com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General com.sun.jersey.core.impl.provider.entity.ReaderProvider com.sun.jersey.core.impl.provider.entity.DocumentProvider com.sun.jersey.core.impl.provider.entity.StreamingOutputProvider com.sun.jersey.core.impl.provider.entity.SourceProvider$SourceWriter com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$General com.sun.jersey.json.impl.provider.entity.JSONArrayProvider$General com.sun.jersey.json.impl.provider.entity.JSONObjectProvider$General com.sun.jersey.json.impl.provider.entity.JSONWithPaddingProvider com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$General com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$General com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy Jul 21, 2013 11:11:17 AM com.sun.jersey.spi.container.ContainerResponse logException SEVERE: Mapped exception to response: 500 (Internal Server Error) javax.ws.rs.WebApplicationException: com.sun.jersey.api.MessageException: A message body writer for Java class org.codehaus.jackson.node.ObjectNode, and Java type class org.codehaus.jackson.node.ObjectNode, and MIME media type application/json was not found at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:285) at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1451) at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1363) at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1353) at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:414) at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537) at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:708) at javax.servlet.http.HttpServlet.service(HttpServlet.java:848) at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:263) at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:178) at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62) at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118) at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1338) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:484) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1065) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:413) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:192) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:999) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:111) at org.eclipse.jetty.server.Server.handle(Server.java:350) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:454) at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:890) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:944) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:630) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:230) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:77) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:606) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:46) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:603) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:538) at java.lang.Thread.run(Thread.java:722) Caused by: com.sun.jersey.api.MessageException: A message body writer for Java class org.codehaus.jackson.node.ObjectNode, and Java type class org.codehaus.jackson.node.ObjectNode, and MIME media type application/json was not found ... 35 more
This is exactly the same problem that I wrote about last year with respect to Jersey Client.
It took me a little while but I eventually found a solution to the problem hidden about half way down a StackOverflow post for a similar exception.
We need to add the following property to our Jersey config:
Map<String, Object> config = new HashMap<String, Object>();
config.put("com.sun.jersey.api.json.POJOMappingFeature", true);
If we edit the SampleConfig from the template it will now look like this:
public class SampleConfig extends GuiceServletContextListener {
@Override
protected Injector getInjector() {
return Guice.createInjector(new ServletModule() {
@Override
protected void configureServlets() {
/* bind the REST resources */
bind(BenchResource.class);
bind(SampleResource.class);
bind(JacksonResource.class);
/* bind jackson converters for JAXB/JSON serialization */
bind(MessageBodyReader.class).to(JacksonJsonProvider.class);
bind(MessageBodyWriter.class).to(JacksonJsonProvider.class);
Map<String, String> initParams = new HashMap<String, String>();
initParams.put("com.sun.jersey.config.feature.Trace",
"true");
initParams.put("com.sun.jersey.api.json.POJOMappingFeature", "true");
serve("*").with(
GuiceContainer.class,
initParams);
}
});
}
}
If we hit ‘/jackson/awesome/mark’ it now returns JSON as expected:
$ curl http://localhost:8080/jackson/awesome/mark -w "\n"
{"name":"mark"}
JSON
Object (computer science)
Template
Jackson (API)
POST (HTTP)
Property (programming)
Scratch (programming language)
Jetty (web server)
Repository (version control)
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