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java EE : Java Enterprise Edition (Jakarta EE)

• java EE is built on java SE(Standard edition)
• This provides platform for developing and running large-scale, multi-tiered, scalable, reliable and secure network applications.
• It provides apis and runtime environments for enterprise feature such as distributed computing, web services and database connectivity.
• Multi-tire architecture:
  • presentation tier - Responsible for interacting with the end user. Technologies like JSP(JavaServer Pages) and JSF (JavaServer Faces) are used.
  • Business tier: Contains business logic of the application. EJBs (Enterprise JavaBeans) are used ti implement the business logic. EJBs can be session beans(stateless or stateful) or message-driven beans.
  • Data-tier: Deals with data storage and retrieval. java database connectivity(JDBC) is used to interact with database.
• Java EE Components:
  • Servlets:
  • JavaServer Pages(JSP):
  • Enterprise Java Beans(EJBs):

CSS Important properties:

Combinators:

types of Combinators in CSS

Servlet filter explanation

pseudo elements in CSS

servlet request and response diagram.

servlet flow diagram

Http methods and status codes

HTTP methods in total we have 7 methods normally used are 5:

• Get : whenever we want get or fetch data from the server

-post : whenever we want to send the data to the server