Question

我刚刚尝试了关于AsyncResponse的泽西教程的示例，可以在这里找到：http://jersey.java.net/apidocs/snapshot/jersey/javax/ws/rs/container/AsyncResponse.html

它似乎不起作用。甚至该示例在简单的单元测试中执行时抛出异常：

public class AsyncTest extends JerseyTest {

    @Override
    protected Application configure() {
        return new ResourceConfig(MyAsync.class)
    }

    @Path("/async")
    public static class MyAsync {
        @GET
        public void asyncGet(@Suspended final AsyncResponse asyncResponse) {

            new Thread(new Runnable() {
                @Override
                public void run() {
                    String result = veryExpensiveOperation();
                    asyncResponse.resume(result);
                }

                private String veryExpensiveOperation() {
                    return "bla";
                }
            }).start();
        }
    }

    @Test
    public void testConvertWordToPdf() throws Exception {
        String result = target().path("async").request().async().get().get(String.class);
    }
}

有人可以告诉我我做错了什么吗？谢谢你的回答！

更新：我甚至尝试过可以在http://search.maven.org/#artifactdetails|org.glassfish.jersey.examples|server-async-standalone-webapp|2.1|war找到的官方示例，但我得到了相同的例外情况。如果我确保AsyncResponse在方法返回之前响应，该示例有效。我得到的堆栈跟踪：

java.util.concurrent.ExecutionException： javax.ws.rs.ProcessingException：java.lang.NullPointerException at com.google.common.util.concurrent.AbstractFuture $ Sync.getValue（AbstractFuture.java:306）在 com.google.common.util.concurrent.AbstractFuture $ Sync.get（AbstractFuture.java:293）在 com.google.common.util.concurrent.AbstractFuture.get（AbstractFuture.java:116） at MyCompany.jersey.ConverterResourceTest.testTest（MyClass.java:20） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method）at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:39）在 sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）在java.lang.reflect.Method.invoke（Method.java:597）at org.testng.internal.MethodInvocationHelper.invokeMethod（MethodInvocationHelper.java:84）在org.testng.internal.Invoker.invokeMethod（Invoker.java:714）at org.testng.internal.Invoker.invokeTestMethod（Invoker.java:901）at at org.testng.internal.Invoker.invokeTestMethods（Invoker.java:1231）at at org.testng.internal.TestMethodWorker.invokeTestMethods（TestMethodWorker.java:127）在 org.testng.internal.TestMethodWorker.run（TestMethodWorker.java:111）在org.testng.TestRunner.privateRun（TestRunner.java:767）at org.testng.TestRunner.run（TestRunner.java:617）at org.testng.SuiteRunner.runTest（SuiteRunner.java:334）at org.testng.SuiteRunner.runSequentially（SuiteRunner.java:329）at at org.testng.SuiteRunner.privateRun（SuiteRunner.java：291）at at org.testng.SuiteRunner.run（SuiteRunner.java:240）at org.testng.SuiteRunnerWorker.runSuite（SuiteRunnerWorker.java:52）at org.testng.SuiteRunnerWorker.run（SuiteRunnerWorker.java:86）at org.testng.TestNG.runSuitesSequentially（TestNG.java:1224）at at org.testng.TestNG.runSuitesLocally（TestNG.java:1149）at at org.testng.TestNG.run（TestNG.java:1057）at org.testng.remote.RemoteTestNG.run（RemoteTestNG.java:111）at at org.testng.remote.RemoteTestNG.initAndRun（RemoteTestNG.java:204）at at org.testng.remote.RemoteTestNG.main（RemoteTestNG.java:175）at at org.testng.RemoteTestNGStarter.main（RemoteTestNGStarter.java:111）引起：javax.ws.rs.ProcessingException： java.lang.NullPointerException at org.glassfish.jersey.client.ClientRuntime $ 1 $ 1.failure（ClientRuntime.java:148）在 org.glassfish.jersey.test.inmemory.internal.InMemoryConnector $ 3.run（InMemoryConnector.java:265）在 java.util.concurrent.Executors $ RunnableAdapter.call（Executors.java:439） at java.util.concurrent.FutureTask $ Sync.innerRun（FutureTask.java:303）在java.util.concurrent.FutureTask.run（FutureTask.java:138）at com.google.common.util.concurrent.MoreExecutors $ SameThreadExecutorService.execute（MoreExecutors.java:293）在 com.google.common.util.concurrent.AbstractListeningExecutorService.submit（AbstractListeningExecutorService.java:49）在 org.glassfish.jersey.test.inmemory.internal.InMemoryConnector.apply（InMemoryConnector.java:257）在 org.glassfish.jersey.client.ClientRuntime $ 1.run（ClientRuntime.java:156）在org.glassfish.jersey.internal.Errors $ 1.call（Errors.java:271）at 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:322）在 org.glassfish.jersey.client.ClientRuntime $ 2.run（ClientRuntime.java:170）在 java.util.concurrent.Executors $ RunnableAdapter.call（Executors.java:439） at java.util.concurrent.FutureTask $ Sync.innerRun（FutureTask.java:303）在java.util.concurrent.FutureTask.run（FutureTask.java:138）at java.util.concurrent.ThreadPoolExecutor中的$ Worker.runTask（ThreadPoolExecutor.java:895）在 java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:918）在java.lang.Thread.run（Thread.java:662）引起： java.lang.NullPointerException at org.glassfish.jersey.internal.util.KeyComparatorHashMap.putAll（KeyComparatorHashMap.java:509）在 javax.ws.rs.core.AbstractMultivaluedMap.putAll（AbstractMultivaluedMap.java:332）在 org.glassfish.jersey.test.inmemory.internal.InMemoryConnector.createClientResponse（InMemoryConnector.java:286）在 org.glassfish.jersey.test.inmemory.internal.InMemoryConnector.apply（InMemoryConnector.java:247）在 org.glassfish.jersey.test.inmemory.internal.InMemoryConnector $ 3.run（InMemoryConnector.java:261） ......还有20个

Answer 1

顺便说一句，我在Grizzly容器中测试了这个测试用例。 InMemory容器不支持它，因为容器未在ContainerResponseWriter上实现挂起操作。 InMemoryResponseWriter应该抛出UnsupportedOperationException而不是返回false。这听起来像是一个泽西岛的虫子。

@Test
public void testConvertWordToPdf() throws Exception {
    String result = target().path("async").request().async().get().get().readEntity(String.class);
    assertEquals("bla", result);
}

这是我的POM依赖：

    <dependency>
        <groupId>org.glassfish.jersey.test-framework.providers</groupId>
        <artifactId>jersey-test-framework-provider-grizzly2</artifactId>
        <version>2.1</version>
        <scope>test</scope>
    </dependency>

如果未在方法生命周期内完成，AsyncResponse将抛出异常

1 个答案: