java - Spring Autowiring 仅扫描测试文件

Question

在使用 JUnit 进行单元测试期间，Spring Autowiring 仅适用于以下位置的文件:

src/test/org/baudo

但不是以下位置的文件:

src/main/org/baudo

因此，当我测试 Autowiring sessionFactory 对象的 DAO 时，结果是我的 session 工厂为 null。然后我得到以下堆栈跟踪:

java.lang.NullPointerException
at org.baudo.dao.MyDAO.addPerson(MyDao.java:46)
at org.baudo.dao.MyDaoTest.testAddPerson(MyDaoTest.java:53)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
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:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
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:309)
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)

这是我扫描组件的配置:

 <context:component-scan base-package="org.baudo" />

事实是我有两个同名的包(一个用于测试，一个在 main 下)。

我该怎么做才能扫描所有文件进行 Autowiring (而不仅仅是测试目录下的文件)？

更多信息:

我正在使用 Spring MVC 和 Hibernate 以及 Maven

这是我的测试 DAO:

@RunWith( SpringJUnit4ClassRunner.class )
@ContextConfiguration(locations={"/spring-servlet.xml"})
public class MyDaoTest {

    @Autowired
    private SessionFactory sessionFactory; // This contains a value

    // Other stuff here
}

这是我的 DAO:

public class MyDao {

    @Autowired
    private SessionFactory sessionFactory; // This is null

    // Other stuff here
}

我的 Dao 位于:

 MyProject\src\main\java\org\baudo\dao

我的测试如下:

 MyProject\src\test\java\org\baudo\dao

我的 spring-servlet.xml 还包含

<context:annotation-config />

<tx:annotation-driven />

这是我定义 bean 的方式:

<bean id="sessionFactory"
    class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
    <property name="dataSource" ref="dataSource" />
    <property name="configLocation">
        <value>classpath:hibernate.cfg.xml</value>
    </property>
    <property name="configurationClass">
        <value>org.hibernate.cfg.AnnotationConfiguration</value>
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">${jdbc.dialect}</prop>
            <prop key="hibernate.show_sql">true</prop>
        </props>
    </property>
</bean>

我应该添加其他东西才能使其正常工作吗？

Answer 1

最可能的原因是您直接创建 MyDao 对象，而不是通过 Spring BeanFactory。您必须将要测试的 DAO Autowiring 到您的测试类中:

// Here live the annotations ... 
public class MyDaoTest {
    @Autowired
    private MyDao myDao;

    @Test
    public void testSomething() {
        // Do what you need with myDao
    }
}

或者使用AspectJ编译器/编织器并要求spring“建议”new操作

<context:spring-configured />