EntityManager proxyEm = (EntityManager) Proxy.newProxyInstance(this.getClass().getClassLoader(), em.getClass()
          .getInterfaces(), new EntityHookAwareInvocationHandler(em, hookSupport));

    // Create a new permission
    StrategyPermission sp = new StrategyPermission();
    sp.setStrategy(strategy);
    sp.setUser(user);
    boolean added = false;

    // Connect the permission to the strategy
    if (strategy.getStrategyPermissions() == null)
      strategy.setStrategyPermissions(new HashSet<StrategyPermission>());

    if (!strategy.getStrategyPermissions().contains(sp)) {
      strategy.getStrategyPermissions().add(sp);
      added = true;
    }

    // Connect the permission to the user
    if (user.getStrategyPermissions() == null)
      user.setStrategyPermissions(new HashSet<StrategyPermission>());

    if (!user.getStrategyPermissions().contains(sp)) {
      user.getStrategyPermissions().add(sp);
      added = true;
    }

    if (added)
      em.persist(sp);

    ((JpaCache) em.getEntityManagerFactory().getCache()).evict(user, true);