ClassCastException異常的JUnit

過程中，這是我的代碼ClassCastException異常的JUnit

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

這很簡單。但我不JUnit測試過程中，爲什麼理解方法getSingleResult（）養classcast例外...

相同的上下文（更多情況下相同的類可以提供這種EX）
檢查SerialID

爲什麼會發生？！？！

感謝

UPDATE 這是堆棧跟蹤

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)

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

來源

2013-07-09 Luigi Candita

你可以用精確的堆棧跟蹤來更新帖子嗎？「Query」的類型是什麼？在'org.hibernate.Query'中我看不到'getSingleResult（）'方法。 – sanbhat

嗨..這是javax.persistence.query –

stacktrace將幫助SO用戶提供快速準確的答案！ – sanbhat

看起來你已經匯入在您的類錯誤Applicazione（既然你有類名同樣，我假設他們在不同的包裝中）。

檢查import聲明Applicazione並修復它。

編輯：

我只是看到你正在使用"from " + Applicazione.class.getName() +" a where a.id = :id"字符串。因此，如果您的查詢返回結果，則即使該賦值也可以工作（無例外）原因您不能爲具有相同名稱的2個不同包類指定簡單名稱，並且其中一個包含完全限定類名。你確定你已經發布了正確的代碼嗎？

來源

2013-07-09 13:18:08 sanbhat

剛剛檢查過...有一個也是唯一一個.. mmm –

您確定關於stacktrace嗎？你的stacktrace傳達你正在投2個不同的課 – sanbhat

我同意你的看法。但我有一個項目（基於Spring的）與模型，道和服務。該模型引用了延續Persistable 的Oracle表。擁有serialID（確保對象的唯一性）。或者這是一個非常愚蠢的事情或一個錯誤。是的，我發佈了正確的代碼。 –

ClassCastException異常的JUnit

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