Using JPA entities in JSF. Which is the best strategy to prevent LazyInitializationException?

Question

Would like to hear experts on best practice of editing JPA entities from JSF UI.

So, a couple of words about the problem.

Imagine I have the persisted object

Answer 1

Open Session in View design pattern can be easy implemented in Java EE environment (with no dependency to hibernate, spring or something else out side Java EE). It is mostly the same as in OpenSessionInView, but instead of Hibernate session you should use JTA transaction

@WebFilter(urlPatterns = {"*"})
public class JTAFilter implements Filter{

    @Resource
    private UserTransaction ut;

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        try{
           ut.begin();
           chain.doFilter(request, response);
        }catch(NotSupportedException | SystemException e){
            throw new ServletException("", e);
        } finally {
            try {
               if(ut.getStatus()!= Status.STATUS_MARKED_ROLLBACK){
                   ut.commit();
               }
            } catch (Exception e) {
                throw new ServletException("", e);
            }
       }
  }

  @Override
  public void destroy() {

  }
}