title: Issue with @WithUserDetails and spring boot 1.4 TestEntityManager
body: <p>I have an issue with Spring Boot's <code>TestEntityManager</code> and <code>@WithUserDetails</code> annotation.</p>
  
  <p>Here is my test suite:</p>
  
  <pre><code>public class AdvertisementAuthorizationTest extends AbstractIntegrationTest {
  
      private static final String IMPERSONATOR_EMAIL = "joe.hacker@gmail.com";
  
      private final static String OWNER_OF_ADVERTISEMENT_EMAIL = "john.nice@gmail.com";
  
      @Autowired
      private TestEntityManager testEntityManager;
  
      @Autowired
      private MockMvc mockMvc;
  
      private Advertisement advertisement;
  
      private UserAccount impersonator;
  
      private ObjectMapper mapper = new ObjectMapper();
  
      @Before
      public void setUp() {
          advertisement = testEntityManager.persist(createAdvertisement(OWNER_OF_ADVERTISEMENT_EMAIL));
          impersonator = testEntityManager.persist(createUserAccount(IMPERSONATOR_EMAIL));
      }
  
      @Test
      @WithUserDetails(IMPERSONATOR_EMAIL)
      public void shouldNotAllowAdvertisementModification() throws Exception {
          String jsonAdvertisement = mapper.writeValueAsString(advertisement);
          mockMvc.perform(put("/api/advertisement/{id}", advertisement.getId())//
                  .contentType(MediaType.APPLICATION_JSON)//
                  .content(jsonAdvertisement))//
                  .andDo(print())//
                  .andExpect(status().isForbidden());//
      }
  
      @Test
      @WithUserDetails(OWNER_OF_ADVERTISEMENT_EMAIL)
      public void shouldAllowAdvertisementModification() throws Exception {
          String jsonAdvertisement = mapper.writeValueAsString(advertisement);
          mockMvc.perform(put("/api/advertisement/{id}", advertisement.getId())//
                  .contentType(MediaType.APPLICATION_JSON)//
                  .content(jsonAdvertisement))//
                  .andDo(print())//
                  .andExpect(status().isOk());//
      }
  
  }
  </code></pre>
  
  <p>Here is the super class:</p>
  
  <pre><code>@AutoConfigureMockMvc
  @AutoConfigureTestEntityManager
  @RunWith(SpringJUnit4ClassRunner.class)
  @SpringBootTest(classes = {TestApplication.class})
  @WebAppConfiguration
  @ActiveProfiles(Profiles.TEST)
  @Transactional
  public abstract class AbstractIntegrationTest {
  
  }
  </code></pre>
  
  <p>When I run the tests it seems the entities are not persisted to <code>H2</code> by <code>TestEntityManager</code> as indicated by this error message:</p>
  
  <pre><code>Hibernate: select useraccoun0_.id as id1_9_, useraccoun0_.address_id as address13_9_, useraccoun0_.email as email2_9_, useraccoun0_.email_notification as email_no3_9_, useraccoun0_.enabled as enabled4_9_, useraccoun0_.first_name as first_na5_9_, useraccoun0_.last_connection_date as last_con6_9_, useraccoun0_.password as password7_9_, useraccoun0_.registration_date as registra8_9_, useraccoun0_.role as role9_9_, useraccoun0_.token as token10_9_, useraccoun0_.user_account_type as user_ac11_9_, useraccoun0_.version as version12_9_ from user_account useraccoun0_ where useraccoun0_.email=?
  22:52:39.943 [Test worker] WARN  o.s.test.context.TestContextManager - Caught exception while allowing TestExecutionListener [org.springframework.security.test.context.support.WithSecurityContextTestExecutionListener@43ec4dcd] to process 'before' execution of test method [public void com.bignibou.it.web.security.advertisement.AdvertisementAuthorizationTest.shouldNotAllowAdvertisementModification() throws java.lang.Exception] for test instance [com.bignibou.it.web.security.advertisement.AdvertisementAuthorizationTest@646496bc]
  java.lang.IllegalStateException: Unable to create SecurityContext using @org.springframework.security.test.context.support.WithUserDetails(value=joe.hacker@gmail.com, userDetailsServiceBeanName=)
      at org.springframework.security.test.context.support.WithSecurityContextTestExecutionListener.createSecurityContext(WithSecurityContextTestExecutionListener.java:79)
      at org.springframework.security.test.context.support.WithSecurityContextTestExecutionListener.beforeTestMethod(WithSecurityContextTestExecutionListener.java:56)
      at org.springframework.test.context.TestContextManager.beforeTestMethod(TestContextManager.java:269)
      at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
      at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
      at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
      at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
      at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
      at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
      at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
      at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
      at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
      at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
      at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
      at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
      at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass(JUnitTestClassExecuter.java:112)
      at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute(JUnitTestClassExecuter.java:56)
      at org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass(JUnitTestClassProcessor.java:66)
      at org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
      at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
      at org.gradle.messaging.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
      at org.gradle.messaging.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
      at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
      at org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:109)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:497)
      at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
      at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
      at org.gradle.messaging.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:364)
      at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)
      at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
      at java.lang.Thread.run(Thread.java:745)
  Caused by: org.springframework.security.core.userdetails.UsernameNotFoundException: Username: joe.hacker@gmail.com not found!
      at com.bignibou.service.security.UserAccountUserDetailsService.loadUserByUsername(UserAccountUserDetailsService.java:21)
      at org.springframework.security.test.context.support.WithUserDetailsSecurityContextFactory.createSecurityContext(WithUserDetailsSecurityContextFactory.java:56)
      at org.springframework.security.test.context.support.WithUserDetailsSecurityContextFactory.createSecurityContext(WithUserDetailsSecurityContextFactory.java:39)
      at org.springframework.security.test.context.support.WithSecurityContextTestExecutionListener.createSecurityContext(WithSecurityContextTestExecutionListener.java:76)
      ... 43 common frames omitted
  </code></pre>
  
  <p>Can someone please help?</p>