Powermock and Spring cause ConversionException when injecting EntityManager in test

Question

When attempting to combine the Spring test runner and the PowerMock runner using the PowerMockRule technique, I get an exception from the Thoughtworks XStream library whenever I try to inject an EntityManager using the PersistenceContext annotation from JPA. The same test works fine when not using the PowerMockRule. I also ignore all packages from the PowerMockLoader at the start of the test. I tried various values for @PowerMockIgnore as this normally solves issues I have with PowerMock, however, this error still happens even when ignoring absolutely every package.

@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() {     } } 

The exception is as follows -- links to full backtrace on pastebin the backtrace exceeded the limit for question length):

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

Relevant persistence unit:

<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 dependencies:

<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> 

Testing using Spring 3.2.3.RELEASE. Note that I have also tested with spring-test version 3.0.5.RELEASE which does indeed resolve some other errors with the Spring/Powermock combination, but not this one.

Answer 1

I had a similar issue and it was suggested to me to create a Resources.java class that Produced an Entity Manager.

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

I'm still not exactly sure why this solution worked for me... but it did.

v/r Ace