title: MessageBodyWriter not found for media type=multipart/form-data in JerseyTest
body: <p>I'm trying to create a test for a <code>POST</code> method in a resource class in a Jersey program.</p>
  
  <p>Here's the <code>POST</code> method of the resource:</p>
  
  <pre><code>@POST @Path("/new")
  @Consumes(MediaType.MULTIPART_FORM_DATA)
  public Response HTTPPostMethod(@FormDataParam("file") InputStream fileIS, 
                             @FormDataParam("file") FormDataContentDisposition contentDispositionHeader) {
      // ... some code that handles the InputStream
  }
  </code></pre>
  
  <p>My <code>ResourceConfig</code> is created in the following way:</p>
  
  <pre><code>public class MyApp extends ResourceConfig {
  
      public MyApp(String param) {
          register(createMoxyJsonResolver());     
          register(MultiPartFeature.class);
          register(MyResource.class);
      }
  
       private static ContextResolver&lt;MoxyJsonConfig&gt; createMoxyJsonResolver() {
          final MoxyJsonConfig moxyJsonConfig = new MoxyJsonConfig();
          Map&lt;String, String&gt; nsPrefixManager = new HashMap&lt;String, String&gt;(1);
          nsPrefixManager.put("http://www.w3.org/2001/XMLSchema-instance", "xsi");
          moxyJsonConfig.setNamespacePrefixMapper(nsPrefixManager).setNamespaceSeparator(':');
          return moxyJsonConfig.resolver();
      }
  
      /**
       * Start the Grizzly HTTP Server
       * 
       */
      public final void startHttpServer(int port) {
          try {
              final String url = "http://localhost:" + port + "/myapp";
              final HttpServer server = 
                      GrizzlyHttpServerFactory
                          .createHttpServer(URI.create(url), this);
  
              Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
                  public void run() {
                      server.shutdown();
                  }
              }));
              Thread.currentThread().join();
  
          } catch (InterruptedException e) {
              e.printStackTrace();
          }
      }
  
      public static void main(String[] args)  {
          try {
              final MyApp app = new MyApp(args[1]);
              int port = Integer.parseInt(args[0]);
              app.startHttpServer(port);
          } catch(NumberFormatException e) {
              e.printStackTrace();
          }
      }
  }
  </code></pre>
  
  <p>My jersey test setup:</p>
  
  <pre><code>public class TestBase extends JerseyTest {
  
      protected Application app;
      protected static final String param = "myparam";
  
      @Override
      protected Application configure() {
          // The MultiPartFeature is registered.
          this.app = new MyApp(param);
          return app;
      }
  }
  </code></pre>
  
  <p>Finally, the test that's causing problems:</p>
  
  <pre><code>public class MyResourceTest extends TestBase {
  
  // ...
  
      @Test
      public void testHTTPPost() {
  
          try {
  
              FileDataBodyPart filePart = new FileDataBodyPart("file", new File("path/to/a/file/i/know/exists"));
              FormDataMultiPart formDataMultipart = new FormDataMultiPart();
              FormDataMultiPart multipart = (FormDataMultiPart)formDataMultipart.bodyPart(filePart);
  
              Response result = target("/myResource/new").request().post(Entity.entity(multipart, multipart.getMediaType()));
              formDataMultipart.close();
              multipart.close();
  
              assertEquals(Response.Status.OK.getStatusCode(), result.getStatus());
          } catch (IOException e) {
              e.printStackTrace();
          }
      }
  
  // ...
  
  }
  </code></pre>
  
  <p>I'm always getting the error:</p>
  
  <pre><code>org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyWriter not found for media type=multipart/form-data, type=class org.glassfish.jersey.media.multipart.FormDataMultiPart, genericType=class org.glassfish.jersey.media.multipart.FormDataMultiPart.
      at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:247)
      at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)
      at org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1130)
      at org.glassfish.jersey.client.ClientRequest.writeEntity(ClientRequest.java:502)
      at org.glassfish.jersey.client.internal.HttpUrlConnector._apply(HttpUrlConnector.java:388)
      at org.glassfish.jersey.client.internal.HttpUrlConnector.apply(HttpUrlConnector.java:285)
      at org.glassfish.jersey.client.ClientRuntime.invoke(ClientRuntime.java:255)
      at org.glassfish.jersey.client.JerseyInvocation$1.call(JerseyInvocation.java:684)
      at org.glassfish.jersey.client.JerseyInvocation$1.call(JerseyInvocation.java:681)
      at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
      at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
      at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
      at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:444)
      at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:681)
      at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:437)
      at org.glassfish.jersey.client.JerseyInvocation$Builder.post(JerseyInvocation.java:343)
      at services.MyResourceTest.testHTTPPost(MyResourceTest.java:151)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
      at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
      at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
      at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
      at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
      at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
      at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
      at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
      at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
      at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
      at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
      at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
      at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
      at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
      at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
      at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
      at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
      at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
      at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
      at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
  </code></pre>
  
  <p>I tried the following code in the <code>TestBase</code>, but it didn't work:</p>
  
  <pre><code>@Override
      protected Application configure() {
          ResourceConfig app = new ResourceConfig();
          app.register(MultiPartFeature.class);
          app.register(MyResource.class);
          this.app = app;
          return app;
      }
  </code></pre>
  
  <p>Same error. What am I doing wrong here?</p>