ClassCastException异常的JUnit

过程中，这是我的代码ClassCastException异常的JUnit

Query query = getEntityManager().createQuery("from " + Applicazione.class.getName() +" a where a.id = :id"); 
    query.setParameter("id", id); 
    Applicazione applicazione = (Applicazione) query.getSingleResult();

这很简单。但我不JUnit测试过程中，为什么理解方法getSingleResult（）养classcast例外...

相同的上下文（更多情况下相同的类可以提供这种EX）
检查SerialID

为什么会发生？！？！

感谢

UPDATE 这是堆栈跟踪

java.lang.ClassCastException: 
it.xxxxx.intranet.core.model.Applicazione cannot be cast to 
it.xxxxx.intranet.core.model.Applicazione 

java.lang.ClassCastException: it.XXXX.intranet.core.model.Applicazione cannot be cast to it.XXXX.intranet.core.model.Applicazione 
    at it.xxxxx.intranet.core.dao.impl.ApplicazioneDaoImpl.findApplicazioneById(ApplicazioneDaoImpl.java:40) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) 
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:155) 
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) 
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) 
    at $Proxy16.findApplicazioneById(Unknown Source) 
    at it.xxxxx.intranet.core.service.impl.ApplicazioneServiceImpl.findApplicazioneById(ApplicazioneServiceImpl.java:25) 
    at it.xxxxx.intranet.core.test.GestioneApplicazioniTest.detailApplicazioneTest(GestioneApplicazioniTest.java:44) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    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)

线：40 Applicazione applicazione = (Applicazione) query.getSingleResult();

来源

2013-07-09 Luigi Candita

你可以用精确的堆栈跟踪来更新帖子吗？ “Query”的类型是什么？在'org.hibernate.Query'中我看不到'getSingleResult（）'方法。 – sanbhat

嗨..这是javax.persistence.query –

stacktrace将帮助SO用户提供快速准确的答案！ – sanbhat

看起来你已经汇入在您的类错误Applicazione（既然你有类名同样，我假设他们在不同的包装中）。

检查import声明Applicazione并修复它。

编辑：

我只是看到你正在使用"from " + Applicazione.class.getName() +" a where a.id = :id"字符串。因此，如果您的查询返回结果，则即使该赋值也可以工作（无例外）原因您不能为具有相同名称的2个不同包类指定简单名称，并且其中一个包含完全限定类名。你确定你已经发布了正确的代码吗？

来源

2013-07-09 13:18:08 sanbhat

刚刚检查过...有一个也是唯一一个.. mmm –

您确定关于stacktrace吗？你的stacktrace传达你正在投2个不同的课 – sanbhat

我同意你的看法。但我有一个项目（基于Spring的）与模型，道和服务。该模型引用了延续Persistable 的Oracle表。拥有serialID（确保对象的唯一性）。或者这是一个非常愚蠢的事情或一个错误。是的，我发布了正确的代码。 –

ClassCastException异常的JUnit

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