'Illegal attempt to call getOutputStream() after getWriter() has already been called' 泽西岛测试期间

Question

我有一个正在尝试测试的 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());
    }
}

例外情况：

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$Responder.getOutputStream(ServerRuntime.java:561)
    at org.glassfish.jersey.message.internal.CommittingOutputStream.commitStream(CommittingOutputStream.java:200)
    at org.glassfish.jersey.message.internal.CommittingOutputStream.flushBuffer(CommittingOutputStream.java:305)
    at org.glassfish.jersey.message.internal.CommittingOutputStream.commit(CommittingOutputStream.java:261)
    at org.glassfish.jersey.message.internal.CommittingOutputStream.close(CommittingOutputStream.java:276)
    at org.glassfish.jersey.message.internal.OutboundMessageContext.close(OutboundMessageContext.java:835)
    at org.glassfish.jersey.server.ContainerResponse.close(ContainerResponse.java:411)
    at org.glassfish.jersey.server.ServerRuntime$Responder.release(ServerRuntime.java:667)
    at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:438)
    at org.glassfish.jersey.server.ServerRuntime.run(ServerRuntime.java:265)
    at org.glassfish.jersey.internal.Errors.call(Errors.java:271)
    at org.glassfish.jersey.internal.Errors.call(Errors.java:267)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:319)
    at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:236)
    at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1028)
    at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:363)
    at org.glassfish.grizzly.http.server.HttpHandler.run(HttpHandler.java:217)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$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]

这几天我一直在用头撞墙，但找不到解决办法。我有多个以相同方式测试的其他端点，没有这个问题。我将 Jersey 2.6 与 Java 6u5.

一起使用

Answer 1

我不知道，我无法使用您提供的内容重现确切的问题（尽管我确实遇到了一些错误）。我只是 post 我测试过的东西，也许你能弄明白。

我所做的主要更改是：

刚刚使用了 Jersey 的注入框架来处理 DI。你可以在下面我 config.register(new AbstractBinder() 的地方看到它。查看更多相关信息 here
将 Mock 的 when 移动到配置点，而不是在测试方法中。

如果您仍然无法让它工作，请尝试仅使用我提供的依赖项和一个测试用例来创建一个新项目。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。如果你想提供一个重现问题的小 Github 项目，我可以看看它。

Maven 依赖项

<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();
    }
}

Answer 2

添加并注册 ExceptionMapper 允许我捕获并输出抛出的错误：

Unrecognized field "name" (Class com.example.ImageVO), not marked as ignorable at [Source:org.glassfish.jersey.message.internal.EntityInputStream@13b7c28; line: 1, column: 149] (through reference chain: com.example.ImageVO["name"])

这是因为我的 ImageVO class 有一个名为 getName 的 public 方法，但没有 name 属性 . POSTing ImageVO 实例导致 JSON 有一个值为 null 的 name 键，创建异常。

对此有两个解决方案：

将 Jackson 的 DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES 属性设置为 false。

在测试中为 post 实体使用实际的 JSON 字符串：

Entity e = Entity.entity("{\"id\":\"TEST\"}", MediaType.APPLICATION_JSON);
Response r = target().path(IMAGE_ENDPOINT).request.post(e, Response.class);

'Illegal attempt to call getOutputStream() after getWriter() has already been called' 泽西岛测试期间

'Illegal attempt to call getOutputStream() after getWriter() has already been called' during Jersey test

java

junit

jersey

mockito

jackson