'在Jersey测试期间已经调用了getWriter（）之后调用getOutputStream（）的非法尝试

Question

我有一个我试图测试的Jersey端点。

端点：

@Path("image")
class ImageResource {

    @Inject
    private ImageService imageService;

    @POST
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.APPLICATION_JSON)
    public Response save(ImageVO imageVO) {
        imageVO = imageService.save(imageVO);
        ResponseVO responseVO = new ResponseVO(true, imageVO);
        return Response.status(Response.Status.CREATED).entity(responseVO).build();
    }
}

测试：

class ImageResourceTest extends JerseyTest {

    private static final String BASE_ENDPOINT = "rest";
    private static final String IMAGE_ENDPOINT = "image";

    @Mock
    private ImageService imageService;

    @InjectMocks
    private ImageResource imageResource;

    @Override
    protected URI getBaseUri() {
        return UriBuilder.fromUri(super.getBaseUri()).path(BASE_ENDPOINT).build();
    }

    @Override
    protected Application configure() {
        MockitoAnnotations.initMocks(this);

        ResourceConfig config = new ResourceConfig();
        config.register(imageResource);
        return config;
    }

    @Test
    public void testSave() {
        ImageVO imageVO = new ImageVO();
        imageVO.setId("TEST");
        when(imageService.save(imageVO)).thenReturn(imageVO);

        Entity e = Entity.entity(imageVO, MediaType.APPLICATION_JSON);
        Response response = target().path(IMAGE_ENDPOINT).request().post(e, Response.class);
        assertEquals(201, response.getStatus());

        ResponseVO responseVO = response.readEntity(ResponseVO.class);
        assertTrue(responseVO.isSuccess());
    }
}

例外：

Jul 13, 2015 9:14:28 AM org.glassfish.jersey.test.grizzly.GrizzlyTestContainerFactory$GrizzlyTestContainer start
INFO: Starting GrizzlyTestContainer...
Jul 13, 2015 9:14:28 AM org.glassfish.grizzly.http.server.NetworkListener start
INFO: Started listener bound to [localhost:9998]
Jul 13, 2015 9:14:28 AM org.glassfish.grizzly.http.server.HttpServer start
INFO: [HttpServer] Started.
Jul 13, 2015 9:14:28 AM org.glassfish.jersey.server.ServerRuntime$Responder process
SEVERE: Error occurred when processing a response created from an already mapped exception.
InboundJaxrsResponse{ClientResponse{method=POST, uri=http://localhost:9998/rest/image, status=500, reason=Request failed.}}
Jul 13, 2015 9:14:28 AM org.glassfish.jersey.server.ServerRuntime$Responder release
WARNING: Attempt to release request processing resources has failed for a request.
java.lang.IllegalStateException: Illegal attempt to call getOutputStream() after getWriter() has already been called.
    at org.glassfish.grizzly.http.server.Response.getNIOOutputStream(Response.java:621)
    at org.glassfish.grizzly.http.server.Response.getOutputStream(Response.java:646)
    at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer$ResponseWriter.writeResponseStatusAndHeaders(GrizzlyHttpContainer.java:265)
    at org.glassfish.jersey.server.ServerRuntime$Responder$1.getOutputStream(ServerRuntime.java:561)
    at org.glassfish.jersey.message.internal.CommittingOutputStream.commitStream(CommittingOutputStream.java:200)
    at org.glassfish.jersey.message.internal.CommittingOutputStream.flushBuffer(CommittingOutputStream.java:305)
    at org.glassfish.jersey.message.internal.CommittingOutputStream.commit(CommittingOutputStream.java:261)
    at org.glassfish.jersey.message.internal.CommittingOutputStream.close(CommittingOutputStream.java:276)
    at org.glassfish.jersey.message.internal.OutboundMessageContext.close(OutboundMessageContext.java:835)
    at org.glassfish.jersey.server.ContainerResponse.close(ContainerResponse.java:411)
    at org.glassfish.jersey.server.ServerRuntime$Responder.release(ServerRuntime.java:667)
    at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:438)
    at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:265)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
    at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
    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:267)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:319)
    at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:236)
    at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1028)
    at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:363)
    at org.glassfish.grizzly.http.server.HttpHandler$1.run(HttpHandler.java:217)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
    at java.lang.Thread.run(Thread.java:619)
Jul 13, 2015 9:14:28 AM org.glassfish.jersey.test.grizzly.GrizzlyTestContainerFactory$GrizzlyTestContainer stop
INFO: Stopping GrizzlyTestContainer...
Jul 13, 2015 9:14:28 AM org.glassfish.grizzly.http.server.NetworkListener shutdownNow
INFO: Stopped listener bound to [localhost:9998]

我已经用头撞了一下墙几天，但找不到解决办法。我有多个其他端点，我以相同的方式测试，没有这个问题。我正在使用Jersey 2.6和Java 6u5。

Answer 1

我不知道，我无法使用你提供的内容重现确切的问题（虽然我确实得到了一些错误）。我会发布我测试过的内容，也许你可以搞清楚。

我所做的主要改变是：

• 只是使用Jersey的注射框架来处理DI。你可以在下面的config.register(new AbstractBinder()看到它。详细了解here
• 将模拟的when移动到配置点，而不是测试方法。

如果仍然无法使其工作，请尝试使用我提供的依赖项和一个测试用例创建一个新项目。如果它有效，那么它就是你没有向我们展示的东西，这可能是问题所在。如果你想提供一个可以重现问题的小型Github项目，我可以看看它。

Maven Dependencies

<dependencies>
    <dependency>
        <groupId>org.glassfish.jersey.test-framework.providers</groupId>
        <artifactId>jersey-test-framework-provider-grizzly2</artifactId>
        <version>2.6</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.jaxrs</groupId>
        <artifactId>jackson-jaxrs-json-provider</artifactId>
        <version>2.4.0</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-all</artifactId>
        <version>1.9.0</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.10</version>
        <scope>test</scope>
    </dependency>
</dependencies>

测试用例

import java.net.URI;
import javax.inject.Inject;
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.client.Entity;
import javax.ws.rs.core.Application;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriBuilder;
import com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider;

import org.glassfish.hk2.utilities.binding.AbstractBinder;
import org.glassfish.jersey.server.ResourceConfig;
import org.glassfish.jersey.test.JerseyTest;
import org.junit.Test;
import static org.junit.Assert.*;
import org.mockito.Mockito;
import static org.mockito.Mockito.when;

public class ImageServiceTest extends JerseyTest {

    private static final String BASE_ENDPOINT = "rest";
    private static final String IMAGE_ENDPOINT = "image";
    private static final ImageVO imageVO = new ImageVO("Test");

    public static interface ImageService {
        ImageVO save(ImageVO imageVo);
    }

    public static class ImageVO {
        public String id;
        public ImageVO() {}
        public ImageVO(String id) { this.id = id; }
    }

    public static class ResponseVO {
        public boolean cool;
        public ImageVO imageVo;
        public ResponseVO() {}
        public ResponseVO(boolean cool, ImageVO imageVo) {
            this.cool = cool; this.imageVo = imageVo;
        }
    }

    @Path("image")
    public static class ImageResource {

        @Inject
        private ImageService imageService;

        @POST
        @Produces(MediaType.APPLICATION_JSON)
        @Consumes(MediaType.APPLICATION_JSON)
        public Response save(ImageVO imageVO) {
            imageVO = imageService.save(imageVO);
            ResponseVO responseVO = new ResponseVO(true, imageVO);
            return Response.status(Response.Status.CREATED).entity(responseVO).build();
        }
    }

    @Override
    public Application configure() {

        final ImageService imageService = Mockito.mock(ImageService.class);
        when(imageService.save(imageVO)).thenReturn(imageVO);

        ResourceConfig config = new ResourceConfig();
        config.register(JacksonJsonProvider.class);
        config.register(ImageResource.class);
        config.register(new AbstractBinder(){
            @Override
            protected void configure() {
                bind(imageService).to(ImageService.class);
            }
        });     
        return config;
    }

    @Override
    protected URI getBaseUri() {
        return UriBuilder.fromUri(super.getBaseUri()).path(BASE_ENDPOINT).build();
    }

    @Test
    public void testSave() {
        Entity e = Entity.entity(imageVO, MediaType.APPLICATION_JSON);
        Response response = target().path(IMAGE_ENDPOINT).request().post(e, Response.class);
        assertEquals(201, response.getStatus());

        ResponseVO responseVO = response.readEntity(ResponseVO.class);
        assertTrue(responseVO.cool);
        response.close();
    }
}