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我有一个简单的JUnit测试的基础上，AbstractJUnit4SpringContextTests类：春天JUnit测试无法正常重用的ApplicationContext
@ContextConfiguration(locations = {
"/test-spring-config.xml", "/test-databaseApplicationContext.xml",
"/test-sharedApplicationContext.xml", "/test-dispatcher-servlet.xml"
})
public class TestTest extends AbstractJUnit4SpringContextTests {
@Test
public void testOneThing() {
}
}
，这是加载应用程序上下文的一部分，一个bean：
<bean id="mySingleton" class="com.company.SingletonClass" />
这个单身人士，因为它在其他项目/地点使用，有一个构造函数，确保在给定的时间只有一个类的实例：
public class SingletonClass {
private static SingletonClass instance = null;
public SingletonClass() {
if (instance != null) {
throw new IllegalStateException("Highlander rules in effect.");
}
instance = this;
}
}
但是，当我运行我的JUnit测试时，此异常被命中。我明白从这个答案：Reuse spring application context across junit test classes
只要locations是相同的应用程序上下文被重用。但是，这似乎并非如此。这是其中的bean被实例化两个位置：
第一：
Thread [main] (Suspended (breakpoint at line 47 in SingletonClass))
SingletonClass.<init>() line: 47
NativeConstructorAccessorImpl.newInstance0(Constructor, Object[]) line: not available [native method]
NativeConstructorAccessorImpl.newInstance(Object[]) line: 57
DelegatingConstructorAccessorImpl.newInstance(Object[]) line: 45
Constructor<T>.newInstance(Object...) line: 525
BeanUtils.instantiateClass(Constructor<T>, Object...) line: 147
CglibSubclassingInstantiationStrategy(SimpleInstantiationStrategy).instantiate(RootBeanDefinition, String, BeanFactory) line: 76
DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).instantiateBean(String, RootBeanDefinition) line: 990
DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).createBeanInstance(String, RootBeanDefinition, Object[]) line: 943
DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).doCreateBean(String, RootBeanDefinition, Object[]) line: 485
DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).createBean(String, RootBeanDefinition, Object[]) line: 456
AbstractBeanFactory$1.getObject() line: 294
DefaultListableBeanFactory(DefaultSingletonBeanRegistry).getSingleton(String, ObjectFactory) line: 225
DefaultListableBeanFactory(AbstractBeanFactory).doGetBean(String, Class<T>, Object[], boolean) line: 291
DefaultListableBeanFactory(AbstractBeanFactory).getBean(String) line: 193
DefaultListableBeanFactory.preInstantiateSingletons() line: 585
GenericApplicationContext(AbstractApplicationContext).finishBeanFactoryInitialization(ConfigurableListableBeanFactory) line: 913
GenericApplicationContext(AbstractApplicationContext).refresh() line: 464
GenericXmlContextLoader(AbstractGenericContextLoader).loadContext(MergedContextConfiguration) line: 103
GenericXmlContextLoader(AbstractGenericContextLoader).loadContext(MergedContextConfiguration) line: 1
DelegatingSmartContextLoader.loadContext(MergedContextConfiguration) line: 228
TestContext.loadApplicationContext() line: 124
TestContext.getApplicationContext() line: 148
DependencyInjectionTestExecutionListener.injectDependencies(TestContext) line: 109
DependencyInjectionTestExecutionListener.prepareTestInstance(TestContext) line: 75
TestContextManager.prepareTestInstance(Object) line: 321
SpringJUnit4ClassRunner.createTest() line: 211
SpringJUnit4ClassRunner$1.runReflectiveCall() line: 288
SpringJUnit4ClassRunner$1(ReflectiveCallable).run() line: 15
SpringJUnit4ClassRunner.methodBlock(FrameworkMethod) line: 290
SpringJUnit4ClassRunner.runChild(FrameworkMethod, RunNotifier) line: 231
SpringJUnit4ClassRunner(BlockJUnit4ClassRunner).runChild(Object, RunNotifier) line: 44
SpringJUnit4ClassRunner(ParentRunner<T>).runChildren(RunNotifier) line: 180
ParentRunner<T>.access$000(ParentRunner, RunNotifier) line: 41
ParentRunner$1.evaluate() line: 173
RunBefores.evaluate() line: 28
RunBeforeTestClassCallbacks.evaluate() line: 61
RunAfters.evaluate() line: 31
RunAfterTestClassCallbacks.evaluate() line: 71
SpringJUnit4ClassRunner(ParentRunner<T>).run(RunNotifier) line: 220
SpringJUnit4ClassRunner.run(RunNotifier) line: 174
JUnit4TestMethodReference(JUnit4TestReference).run(TestExecution) line: 50
TestExecution.run(ITestReference[]) line: 38
RemoteTestRunner.runTests(String[], String, TestExecution) line: 467
RemoteTestRunner.runTests(TestExecution) line: 683
RemoteTestRunner.run() line: 390
RemoteTestRunner.main(String[]) line: 197
二：
Thread [main] (Suspended (breakpoint at line 47 in SingletonClass))
SingletonClass$$EnhancerByCGLIB$$e8a4cc48(SingletonClass).<init>() line: 47
SingletonClass$$EnhancerByCGLIB$$e8a4cc48.<init>() line: not available
NativeConstructorAccessorImpl.newInstance0(Constructor, Object[]) line: not available [native method]
NativeConstructorAccessorImpl.newInstance(Object[]) line: 57
DelegatingConstructorAccessorImpl.newInstance(Object[]) line: 45
Constructor<T>.newInstance(Object...) line: 525
ReflectUtils.newInstance(Constructor, Object[]) line: 228
ReflectUtils.newInstance(Class, Class[], Object[]) line: 220
ReflectUtils.newInstance(Class) line: 216
Enhancer.createUsingReflection(Class) line: 643
Enhancer.firstInstance(Class) line: 538
Enhancer(AbstractClassGenerator).create(Object) line: 225
Enhancer.createHelper() line: 377
Enhancer.create() line: 285
Cglib2AopProxy.getProxy(ClassLoader) line: 201
ProxyFactory.getProxy(ClassLoader) line: 112
InfrastructureAdvisorAutoProxyCreator(AbstractAutoProxyCreator).createProxy(Class<?>, String, Object[], TargetSource) line: 476
InfrastructureAdvisorAutoProxyCreator(AbstractAutoProxyCreator).wrapIfNecessary(Object, String, Object) line: 362
InfrastructureAdvisorAutoProxyCreator(AbstractAutoProxyCreator).postProcessAfterInitialization(Object, String) line: 322
DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).applyBeanPostProcessorsAfterInitialization(Object, String) line: 407
DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).initializeBean(String, Object, RootBeanDefinition) line: 1461
DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).doCreateBean(String, RootBeanDefinition, Object[]) line: 519
DefaultListableBeanFactory(AbstractAutowireCapableBeanFactory).createBean(String, RootBeanDefinition, Object[]) line: 456
AbstractBeanFactory$1.getObject() line: 294
DefaultListableBeanFactory(DefaultSingletonBeanRegistry).getSingleton(String, ObjectFactory) line: 225
DefaultListableBeanFactory(AbstractBeanFactory).doGetBean(String, Class<T>, Object[], boolean) line: 291
DefaultListableBeanFactory(AbstractBeanFactory).getBean(String) line: 193
DefaultListableBeanFactory.preInstantiateSingletons() line: 585
GenericApplicationContext(AbstractApplicationContext).finishBeanFactoryInitialization(ConfigurableListableBeanFactory) line: 913
GenericApplicationContext(AbstractApplicationContext).refresh() line: 464
GenericXmlContextLoader(AbstractGenericContextLoader).loadContext(MergedContextConfiguration) line: 103
GenericXmlContextLoader(AbstractGenericContextLoader).loadContext(MergedContextConfiguration) line: 1
DelegatingSmartContextLoader.loadContext(MergedContextConfiguration) line: 228
TestContext.loadApplicationContext() line: 124
TestContext.getApplicationContext() line: 148
DependencyInjectionTestExecutionListener.injectDependencies(TestContext) line: 109
DependencyInjectionTestExecutionListener.prepareTestInstance(TestContext) line: 75
TestContextManager.prepareTestInstance(Object) line: 321
SpringJUnit4ClassRunner.createTest() line: 211
SpringJUnit4ClassRunner$1.runReflectiveCall() line: 288
SpringJUnit4ClassRunner$1(ReflectiveCallable).run() line: 15
SpringJUnit4ClassRunner.methodBlock(FrameworkMethod) line: 290
SpringJUnit4ClassRunner.runChild(FrameworkMethod, RunNotifier) line: 231
SpringJUnit4ClassRunner(BlockJUnit4ClassRunner).runChild(Object, RunNotifier) line: 44
SpringJUnit4ClassRunner(ParentRunner<T>).runChildren(RunNotifier) line: 180
ParentRunner<T>.access$000(ParentRunner, RunNotifier) line: 41
ParentRunner$1.evaluate() line: 173
RunBefores.evaluate() line: 28
RunBeforeTestClassCallbacks.evaluate() line: 61
RunAfters.evaluate() line: 31
RunAfterTestClassCallbacks.evaluate() line: 71
SpringJUnit4ClassRunner(ParentRunner<T>).run(RunNotifier) line: 220
SpringJUnit4ClassRunner.run(RunNotifier) line: 174
JUnit4TestMethodReference(JUnit4TestReference).run(TestExecution) line: 50
TestExecution.run(ITestReference[]) line: 38
RemoteTestRunner.runTests(String[], String, TestExecution) line: 467
RemoteTestRunner.runTests(TestExecution) line: 683
RemoteTestRunner.run() line: 390
RemoteTestRunner.main(String[]) line: 197
什么是构造函数之所以被称为两次，我怎样才能防止这种情况发生？虽然这些单身检查看起来好像在向单元测试环境抛出扳手，但在实际生产中，它们在过去很好地表现出了“硬”限制。
在你所有的4个上下文文件中，这个类只有一个''声明吗？ –
@SotiriosDelimanolis是的，它只在其中一个上下文文件中定义。 –
我无法重现您的问题。你能发表任何其他信息吗？也许你的上下文或其他可能相关的'@ Test'情况。你在任何地方都有'@ DirtiesContext'吗？ –