Powermock和Spring在测试中注入EntityManager时导致ConversionException

Question

当尝试使用PowerMockRule技术组合Spring测试运行程序和PowerMock运行程序时，每当我尝试使用JPA中的PersistenceContext注释注入EntityManager时，我都会从Thoughtworks XStream库中得到一个异常。不使用PowerMockRule时，同样的测试效果良好。在测试开始时，我还会忽略PowerMockLoader中的所有包。我尝试了@PowerMockIgnore的各种值，因为这通常可以解决我在PowerMock中遇到的问题，然而，即使忽略了所有包，这个错误仍然会发生。

@PowerMockIgnore("*")
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("/test-configuration.xml")
public class SpringAndPowerMockTest {
    @Rule
    public PowerMockRule rule = new PowerMockRule();
    @PersistenceContext
    private EntityManager manager;
    @Test
    public void test() {
    }
}

异常如下所示——链接到pastebin上的完整回溯（回溯超过了问题长度的限制）：

com.thoughtworks.xstream.converters.ConversionException: Could not call org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.readObject() : Could not call java.util.concurrent.CopyOnWriteArrayList.readObject() : Could not call java.security.CodeSource.readObject() : null

相关持久性单位：

<persistence-unit name="inMemory">
  <provider>org.hibernate.ejb.HibernatePersistence</provider>
  <properties>
    <property name="hibernate.connection.driver_class" value="org.h2.Driver" />
    <property name="hibernate.connection.url" value="jdbc:h2:mem:InMemoryUnitTests;MODE=MySQL;DB_CLOSE_ON_EXIT=FALSE" />
    <property name="hibernate.connection.username" value="sa" />
    <property name="hibernate.connection.password" value="" />
    <property name="hibernate.hbm2ddl.auto" value="create-drop" />
  </properties>
</persistence-unit>

Maven依赖项：

<dependencies>
<dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-module-junit4</artifactId>
        <version>1.5.1</version>
        <scope>test</scope>
</dependency>
<dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-api-mockito</artifactId>
        <version>1.5.1</version>
        <scope>test</scope>
</dependency>
<dependency>
        <groupId>org.mockito</groupId>
        <artifactId>mockito-core</artifactId>
        <version>1.9.5</version>
        <scope>test</scope>
</dependency>
<dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-api-easymock</artifactId>
        <version>1.5.1</version>
        <scope>test</scope>
</dependency>
<dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-module-junit4-rule</artifactId>
        <version>1.5.1</version>
        <scope>test</scope>
</dependency>
<dependency>
        <groupId>org.powermock</groupId>
        <artifactId>powermock-classloading-xstream</artifactId>
        <version>1.5.1</version>
        <scope>test</scope>
</dependency>
</dependencies>

使用Spring 3.2.3.RELEASE进行测试。请注意，我还测试了spring测试版本3.0.5.RELEASE，它确实解决了spring/Powermock组合的其他一些错误，但没有解决这个错误。

Answer 1

我遇到了类似的问题，有人建议我创建一个Resources.java类来生成实体管理器。

@Stateful
public class Resources implements Serializable {
    @PersistenceContext (type = PersistenceContextType.TRANSACTION)
    private EntityManager entityManager;
    @Produces
    public EntityManager getEntityManager() {
        return entityManager;
    }
}

我仍然不确定为什么这个解决方案对我有效……但它确实有效。

v/rAce