Advantages of J2EE: Enterprise application, which guarantees the efficiency, performance and security of enterprise application with a series of standards. And there are many standard providers, mature product technologies and many mature cases.

Disadvantages of J2EE: The system and standards are huge and complicated, so small and medium-sized enterprises don't need so many standards and technologies. The implementation of the system is also bloated, such as EJB, and now many technologies have alternatives.