Quick Answer: Can We Override JSP Service Method?

What is JSP useBean?

The jsp:useBean action tag is used to locate or instantiate a bean class.

If bean object of the Bean class is already created, it doesn’t create the bean depending on the scope.

But if object of bean is not created, it instantiates the bean..

Which one is correct order of phases in JSP life cycle?

Which one is the correct order of phases in JSP life cycle? Explanation: The correct order is Compilation, Initialization, Execution, Cleanup.

Why is used in JSP?

JavaServer Pages (JSP) is a Java standard technology that enables you to write dynamic, data-driven pages for your Java web applications. JSP is built on top of the Java Servlet specification. The two technologies typically work together, especially in older Java web applications.

Can we override service method in Servlet?

Unlike Generic Servlet, the HTTP Servlet doesn’t override the service() method. Instead it overrides the doGet() method or doPost() method or both. The doGet() method is used for getting the information from server while the doPost() method is used for sending information to the server.

When destroy method of JSP is called?

destroy() method is called by the servlet container to indicate to a servlet that the servlet is being taken out of service. This method is only called once all threads within the servlet’s service method have exited or after a timeout period has passed.

Which JSP method is used to perform cleanup?

_jspService() method is used to serve the raised requests by JSP.It takes request and response object as parameters. This method cannot be overridden. JSP Cleanup : In order to remove the JSP from use by the container or to destroy method for servlets jspDestroy()method is used.

What are JSP LifeCycle methods?

The Lifecycle of a JSP Page Classloading (the classloader loads class file) Instantiation (Object of the Generated Servlet is created). Initialization ( the container invokes jspInit() method). Request processing ( the container invokes _jspService() method).

Why is _jspService () method starting with an ‘_’?

Why is _jspService() method starting with an ‘_’ while other life cycle methods do not? _jspService() method will be written by the container hence any methods which are not to be overridden by the end user are typically written starting with an ‘_’.

When destroy method is called?

destroy. void destroy() Called by the servlet container to indicate to a servlet that the servlet is being taken out of service. This method is only called once all threads within the servlet’s service method have exited or after a timeout period has passed.

How JSP is compiled?

The JSP engine compiles the servlet into an executable class and forwards the original request to a servlet engine. A part of the web server called the servlet engine loads the Servlet class and executes it. During execution, the servlet produces an output in HTML format.

What is the first stage in the JSP life cycle?

A Java servlet file is generated from a JSP source file. This is the first step of JSP life cycle. In translation phase, container validates the syntactic correctness of JSP page and tag files.

What JSP LifeCycle methods can I override?

JSP contains three life cycle methods namely jspInit( ), _jspService() and jspDestroy(). In these, jspInit() and jspDestroy() can be overridden and we cannot override _jspService().