Who is loading the init method of servlet

You should never care about the actual implementation class name or type. In other words, all you need to know are the methods you can call on the objects the Container gives you as part of the request! Are those interfaces extending interfaces? A: Yes.

Remember, interfaces can have their own inheritance tree. This means, for example, that whoever implements HttpServletRequest must provide implementation methods for the methods declared in the HttpServletRequest interface and the methods in the ServletRequest interface.

Somebody, somewhere, one could imagine, is using the servlet technology model without the HTTP protocol. Still, the flexibility was designed into the servlet model for those who might want to use servlets with, say, SMTP or perhaps a proprietary custom protocol.

You are, however, still supposed to know how the class hierarchy works. When we refer to a Schroedinger state , we mean something that is neither fully dead or fully alive, but in some really weird place in between. Skip to main content. Start your free trial. In the beginning: loading and initializing. Flex Your Mind Why is there an init method? What kind of code would you put in the init method? Servlet Initialization: when an object becomes a servlet. And finally means finally: init is called after all the variable declarations in the package have evaluated their initializers , and those are evaluated only after all the imported packages have been initialized.

This method is only called once all threads within the servlet's service method have exited or after a timeout period has passed. The web container or servlet container. Proprietary API. Many proprietary web servers have built-in support for server-side programming. Serverside JavaScript.

Servlets aren't ancient history , they are the building blocks of the frameworks you are using. Servlets aren't dead. However, you probably won't be writing your own custom servlets. A servlet is a Java programming language class that is used to extend the capabilities of servers that host applications accessed by means of a request-response programming model.

All servlets must implement the Servlet interface, which defines life-cycle methods. A JSP life cycle is defined as the process from its creation till the destruction. This is similar to a servlet life cycle with an additional step which is required to compile a JSP into servlet. The Servlet interface is the root interface of the servlet class hierarchy. All Servlets need to either directly or indirectly implement the Servlet interface.

Note: The init method is called only once during the life cycle of servlet. Each time the web server receives a request for servlet, it spawns a new thread that calls service method. The web container calls the service method each time when request for the servlet is received.

If servlet is not initialized, it follows the first three steps as described above then calls the service method. If servlet is initialized, it calls the service method. Notice that servlet is initialized only once. The servlet instance is created only once in the servlet life cycle.

The web container calls the service method each time when request for the servlet is received. If servlet is not initialized, it follows the first three steps as described above then calls the service method.

If servlet is initialized, it calls the service method. Notice that servlet is initialized only once. The syntax of the service method of the Servlet interface is given below:.

The web container calls the destroy method before removing the servlet instance from the service. It gives the servlet an opportunity to clean up any resource for example memory, thread etc. The syntax of the destroy method of the Servlet interface is given below:. JavaTpoint offers too many high quality services. Mail us on [email protected] , to get more information about given services.

Please mail your requirement at [email protected] Duration: 1 week to 2 week. Servlet Tutorial. War File welcome-file-list Load on startup. Servlet Collaboration. RequestDispacher sendRedirect. Servlet Advance Session Tracking. Life Cycle of a Servlet Servlet class is loaded Servlet instance is created init method is invoked service method is invoked destroy method is invoked. Reinforcement Learning. R Programming. React Native.