It is said that EJB abstract the business logic from the Servlets. Every Entity Bean method invocation requires ejbLoad and ejbStore to be called before and after the method invocation respectively. However this could result in an increased network traffic between the database server and EJB server frequently. What in case if we manage to write the SQL queries in the servlet itself and manage transactions explicitly. Does it mean that EJB is used to ease transaction management and distribute objects across network , though system response time may come down ?