It can receive requests from clients and return responses. If an instance of the servlet does not exist, the web container. A servlet class is loaded when first request for the servlet is received by the web container. The servlet calls service method to process a clients request. The following figure depicts a typical servlet lifecycle scenario. This is the main component of web server that manages the life cycle of servlets. The life cycle of the servlet is managed by the servlet container.
Servlet lifecycle the java ee 6 tutorial oracle docs. Servlet is an interface that must be implemented for creating any servlet. The servlet is initialized by calling the init method. Life cycle of a servlet servlet life cycle javatpoint. The servlet is terminated by calling the destroy method. Besides studying them online you may download the ebook in pdf format. The servlet tutorials you find in this website uses apache tomcat web. Servlet life cycle can be defined as the stages through which the servlet passes from its creation to its destruction.
After the servlet class is loaded, web container creates the instance of it. Gain some insights into the life cycle of servlets from its birth to destruction within the runtime environment. Servlet is a technology which is used to create a web application. Servlet is a class that extends the capabilities of the servers and responds to the incoming requests. The whole life cycle of a servlet breaks up into 3 phases. A servlet is basically a small java program that runs within a web server. The servlet is in new state if servlet instance is created.
In this section you will learn about the lifecycle of an applet and different methods of an applet. Invokes the service method service, passing a request and response object. The web container maintains the life cycle of a servlet instance. A servlet is managed through a well defined life cycle that defines how it is loaded. In this tutorial i will explain what is the lifecyle of servlet how servlet work. In this article, we will build a simple employee registration form example using a combination of jsp, servlet, jdbc and mysql database. You can monitor and react to events in a servlets lifecycle by defining listener objects whose methods get invoked when lifecycle events occur. As displayed in the above diagram, there are three states of a servlet. The life cycle of a servlet is controlled by the container in which the servlet has been deployed. Java servlet life cycle example examples java code geeks 2020. Jsp and servlet tutorial in hindi lec2 life cycle of servlet by alok. A servlet life cycle can be defined as the entire process from its creation till the destruction. Servlet is an api that provides many interfaces and classes including documentation.
Initializes the servlet instance by calling the init method init. When a request is mapped to a servlet, the container performs the following steps. The life cycle is the process from the construction till the destruction of any object. A servlet is first loaded and initialized usually when it is requested by the corresponding. In this lesson of servlet technology tutorial we will be going through the lifecycle of a servlet. Figure 21 shown below is a diagram depicting the state transitions for various asynchronous. This tutorial will teach you how to use java servlets to develop your web based applications in simple. Servlet instance is created only once in the life cycle.