Question

在Spring MVC应用程序中运行JUnit Test时出现问题。测试1（insertTweet）似乎运行正常，但是在测试2中我得到一个“LazyInitializationException”异常（参见下面的完整stactrace）。我明白为什么它被抛出但不确定为什么会话正在关闭以及如何在每次测试2开始时重新打开它（或者保持现有会话打开以完成剩余的测试）？我已经粘贴了与Test Classes一起抛出的整个StackTrace。

org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.project.user.User.tweets, could not initialize proxy - no Session
    at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:566)
    at org.hibernate.collection.internal.AbstractPersistentCollection.withTemporarySessionIfNeeded(AbstractPersistentCollection.java:186)
    at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:545)
    at org.hibernate.collection.internal.AbstractPersistentCollection.write(AbstractPersistentCollection.java:370)
    at org.hibernate.collection.internal.PersistentBag.add(PersistentBag.java:291)
    at com.project.core.tweet.Tweet.<init>(Tweet.java:113)
    at com.project.core.service.impl.FanoutServiceTester.insertTweet(FanoutServiceTester.java:69)
    at com.project.core.service.impl.FanoutServiceTester.testInsertRetweet(FanoutServiceTester.java:62)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

@RunWith(SpringJUnit4ClassRunner.class)
@TestExecutionListeners({ServiceTestExecutionListener.class})
@ActiveProfiles("test")
public abstract class AbstractServiceImplTest extends AbstractTransactionalJUnit4SpringContextTests {

    @PersistenceContext
    protected EntityManager em;

    @Autowired protected TweetService tweetService;
    @Autowired protected UserService userService;

}


public class FanoutServiceTester extends AbstractServiceImplTest{
    private static User user = null;
    private static User userTwo = null;



    @Before
    public void setUp() throws Exception {

        user = userService.findByUserId(1);


        //UserTwo Follows User One
        userTwo  = userService.findByUserId(2);



    }


    @Test
    public final void testInsertTweet() {       
        insertTweet();

        //Assert Here

    }



    @Test
    public final void testInsertRetweet() {
        insertTweet();
        //Assert Here

    }


    private Tweet insertTweet(){
        Tweet tweet = new Tweet(user);
        String text = "This is a Message";  
        tweet.setTweetText(text);
        Tweet saved = tweetService.save(tweet);
        return saved;
    }

}

Answer 1

在您的测试方法上添加@Transactional - ben75 2013年11月6日14:29

是的，我已经解决了这个问题：

        @RunWith(SpringJUnit4ClassRunner.class)
        @ContextConfiguration(locations = { "classpath*:applicationContext.xml"})
        @Transactional
        public class UserinfoActionTest extends StrutsSpringJUnit4TestCase<UserinfoAction> {
                @Test
            public void testLogin2(){
                          request.setParameter("jsonQueryParam", param);
                String str = null;
        try {

                    str = executeAction("/login.action");
                    HashMap<String,List<TUserinfo>> map = (HashMap<String,List<TUserinfo>>)findValueAfterExecute("outDataMap"); }
 catch (Exception e) {
                    e.printStackTrace();
                }

            }


        @Controller
        @Results({  
            @Result(name="json",type="json"
                    , params={"root","outDataMap","excludeNullProperties","true"
                            ,"excludeProperties","^ret\\[\\d+\\]\\.city\\.province,^ret\\[\\d+\\]\\.enterprise\\.userinfos","enableGZIP","true"
                    })
        })
        public class UserinfoAction extends BaseAction {
                    @Action(value="login")

            public String login(){
                if(jsonQueryParam!=null && jsonQueryParam.length()>0)
                {
                    user = JsonMapper.fromJson(jsonQueryParam, TUserinfo.class);
                }
                Assert.notNull(user);
                 //RESULT="ret" addOutJsonData: put List<TUserinfo> into outDataMap with key RESULT for struts2 JSONResult  
                addOutJsonData(RESULT, service.login(user));
                return JSON;
            }

Answer 2

您错过了TransactionalTestExecutionListener。默认情况下，当您未自己定义任何TestExecutionListener时，它是必需的。但是只要你明确地定义一个：它就会被删除。

声明：

@TestExecutionListeners({ServiceTestExecutionListener.class, TransactionalTestExecutionListener.class})

请参阅3.2.x Spring文档的“Testing - Transaction management”。

Answer 3

我遇到了这个错误并且有点误导。 Session未被关闭。

当你致电userService.findByUserId(1);时，它可能会Join到Tweets表格，所以你收回了这个集合：

com.project.user.User.tweets

默认情况下，Hibernate不会初始化此集合。要初始化它，您可以调用Hibernate.initialize()，例如：

Hibernate.initialize(user.getTweets());

当然，将getTweets()替换为返回tweets集合的实际方法。

Answer 4

享受

@RunWith(SpringRunner.class)
@SpringBootTest
@Transactional // The magic is here
public class YourClassTests {

...

}

在JUnit测试用例上获取LazyInitializationException

4 个答案: