How to get Spring to autowire integration test class using multiple contexts?

One of my integration tests uses multiple Spring context files. It seems that Spring only autowires in beans from the first context and not the second. Does anyone know what I am doing wrong or how to work around the problem?

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {
        "classpath:/META-INF/spring/applicationContext.xml",
        "classpath:/META-INF/spring/applicationContext-security.xml"})
@Configurable
public class UserDetailsServiceImplIntegrationTest {

    @Autowired
    UserDataOnDemand dod;
    // @Autowired does not work for this bean from applicationContext-security.xml
    UserDetailsService userDetailsService;

    @Before
    public void setup() {
        dod.init();
        // workaround for autowiring problem
        userDetailsService = (UserDetailsService)ctx.getBean("userDetailsService");
    }

    @Test
    public void testLoadUser() {
        UserDetails ud = userDetailsService.loadUserByUsername("david@somewhere.co.za");
        Assert.assertEquals("david@somewhere.co.za", ud.getUsername());
    }
}

I am using Spring 3.0.3.

Here is the stack trace when I uncomment the @Autowired line for UserDetailsService:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'za.co.acme.app.security.UserDetailsServiceImplIntegrationTest': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: org.springframework.security.core.userdetails.UserDetailsService za.co.acme.app.security.UserDetailsServiceImplIntegrationTest.userDetailsService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [org.springframework.security.core.userdetails.UserDetailsService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframe