The servlet calls service method to process a clients request. The servlet is initialized by calling the init method. As displayed in the above diagram, there are three states of a servlet. After the servlet class is loaded, web container creates the instance of it. You can monitor and react to events in a servlets lifecycle by defining listener objects whose methods get invoked when lifecycle events occur. A servlet life cycle can be defined as the entire process from its creation till the destruction. A servlet class is loaded when first request for the servlet is received by the web container. A servlet is managed through a well defined life cycle that defines how it is loaded. This tutorial will teach you how to use java servlets to develop your web based applications in simple. Servlet is an api that provides many interfaces and classes including documentation. Invokes the service method service, passing a request and response object. In this lesson of servlet technology tutorial we will be going through the lifecycle of a servlet. When a request is mapped to a servlet, the container performs the following steps.
Gain some insights into the life cycle of servlets from its birth to destruction within the runtime environment. Initializes the servlet instance by calling the init method init. Servlet life cycle can be defined as the stages through which the servlet passes from its creation to its destruction. In this article, we will build a simple employee registration form example using a combination of jsp, servlet, jdbc and mysql database. The life cycle of the servlet is managed by the servlet container. This is the main component of web server that manages the life cycle of servlets. The servlet tutorials you find in this website uses apache tomcat web. Servlet is a class that extends the capabilities of the servers and responds to the incoming requests. Servlet is an interface that must be implemented for creating any servlet. A servlet is first loaded and initialized usually when it is requested by the corresponding. The servlet is in new state if servlet instance is created.
If an instance of the servlet does not exist, the web container. Java servlet life cycle example examples java code geeks 2020. Servlet instance is created only once in the life cycle. The whole life cycle of a servlet breaks up into 3 phases. It can receive requests from clients and return responses. A servlet is basically a small java program that runs within a web server. Servlet lifecycle the java ee 6 tutorial oracle docs. Servlet is a technology which is used to create a web application. In this section you will learn about the lifecycle of an applet and different methods of an applet. The life cycle is the process from the construction till the destruction of any object.
The following figure depicts a typical servlet lifecycle scenario. The servlet is terminated by calling the destroy method. The web container maintains the life cycle of a servlet instance. The life cycle of a servlet is controlled by the container in which the servlet has been deployed. Besides studying them online you may download the ebook in pdf format. Jsp and servlet tutorial in hindi lec2 life cycle of servlet by alok. In this tutorial i will explain what is the lifecyle of servlet how servlet work.