public ODataContext mockWithoutOnJPAWriteContent() throws ODataException {
   ODataContext context = EasyMock.createMock(ODataContext.class);
   EasyMock.expect(context.getService()).andReturn(odataService).anyTimes();
   EasyMock.expect(context.getPathInfo()).andReturn(pathInfo).anyTimes();
   EasyMock.expect(context.isInBatchMode()).andReturn(this.isInBatchMode).anyTimes();
   ODataJPAServiceFactoryMock mockServiceFactory = new ODataJPAServiceFactoryMock(context);
   mockServiceFactory.initializeODataJPAContextX();
   EasyMock.expect(context.getServiceFactory()).andReturn(mockServiceFactory).anyTimes();
   EasyMock.replay(context);
   return context;
 }
  /**
   * Return a Conversation entity representing a two-party connection between the authenticated user
   * and the specified target user id. If such a two-way Conversation already exists, return that,
   * otherwise return a new Conversation.
   *
   * @param targetMessageUserId the OChat user entity to connect with
   * @return the two-way Conversation entity
   * @throws ODataException
   */
  @EdmFunctionImport(
      returnType = @ReturnType(type = Type.ENTITY, isCollection = false),
      entitySet = "Conversations",
      httpMethod = HttpMethod.GET)
  public Conversation createConversation(
      @EdmFunctionImportParameter(name = "TargetUserId", facets = @EdmFacets(nullable = false))
          final Integer targetMessageUserId)
      throws ODataException {

    Conversation result = null;
    EntityManager em = Utility.getEntityManagerFactory().createEntityManager();

    if (targetMessageUserId <= 0) {
      throw new ODataException("Invalid TargetUserId");
    }

    /*
     * Get the authenticated username
     */
    ODataContext ctx = ODataJPAContextImpl.getContextInThreadLocal();
    HttpServletRequest r =
        (HttpServletRequest) ctx.getParameter(ODataContext.HTTP_SERVLET_REQUEST_OBJECT);
    String user = r.getRemoteUser();
    MessageUser u1 = null;
    if (user != null) {
      u1 = IdentityInteraction.verifyUser(r, em);
      logger.debug("username from HttpServletRequest '" + u1.getUsername() + "'");
    } else {
      // This error will have the side effect of returning an empty result set
      logger.error(
          "Assertion error: There is no authenticated user defined in the HttpServletRequest -- "
              + "check your web.xml application configuration");
      throw new ODataException(
          "There is no authenticated user defined in the HttpServletRequest -- "
              + "check your web.xml application configuration");
    }

    // Determine if there is already a conversation that
    // includes exactly the target user and the authenticated user.
    // If so, return that without making and changes to data.
    // If not, create a new Conversation.
    TypedQuery<Conversation> queryBP;
    try {
      // Select all Conversations where the authenticated user is a member.
      queryBP =
          em.createQuery(
              "SELECT DISTINCT E1 from Conversation E1 JOIN E1.messageUsers E0 "
                  + "WHERE E0.username = :user ORDER BY E1.conversationId",
              Conversation.class);
      queryBP.setParameter("user", user);

      // Look for a Conversation that contains only the authenticated and target user
      boolean found = false;
      for (Conversation c : queryBP.getResultList()) {
        while (!found) {
          // must be a two person conversation
          if (c.getMessageUsers().size() == 2) {
            for (MessageUser u : c.getMessageUsers()) {
              if (u.getUserId() == targetMessageUserId.intValue()) {
                found = true;
                result = c;
                break;
              }
            }
          }
        }
      }

      // If a two-person conversation didn't exist, create it
      if (!found) {

        MessageUser u2 = em.find(MessageUser.class, targetMessageUserId);

        if (u2 == null) {
          throw new ODataException("Invalid TargetUserId");
        }

        em.getTransaction().begin();

        result = new Conversation();
        result.setName(u1.getDisplayableName() + ", " + u2.getDisplayableName());
        result.setMessageUsers(new ArrayList<MessageUser>());
        result.getMessageUsers().add(u1);
        result.getMessageUsers().add(u2);
        em.persist(result);

        em.getTransaction().commit();
      }
    } catch (Exception e) {
      throw new ODataException(e.getMessage());
    }

    return result;
  }