A JSP page can override this method by including a definition for it in a declaration element. A JSP page should redefine the init () method from Servlet. jspDestroy void jspDestroy () The jspDestroy () method is invoked when the JSP page is about to be destroyed.
Full Answer
What is jspinit () and jspdestroy () methods?
JSP: What is jspInit (), _jspService () and jspDestroy () methods? The jspInit () method of the javax.servlet.jsp.JspPage interface is similar to the init () method of servlets. This method is invoked by the container only once when a JSP page is initialized.
How to destroy a JSP page in Java?
The jspDestroy () method of the javax.servlet.jsp.JspPage interface is invoked by the container when a JSP page is about to be destroyed. This method is similar to the destroy () method of servlets.
Is it possible to access implicit objects in jspinit and jspdestroy?
From jspInit () and jspDestroy () you can not access any implicit objects. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question.
Can I override jspInit?
The difference between overriding jspInit() and jspService() is that - _jspService() will always be there in any JSP->java file and will take precedence and our jspService() method will not be used ever. But _jspInit() method appears in jsp->java file conditionally.
What will you use to override JSP lifecycle methods?
Last modified on July 25th, 2014 by Joe. JSP contains three life cycle methods namely jspInit( ), _jspService() and jspDestroy(). In these, jspInit() and jspDestroy() can be overridden and we cannot override _jspService().
Can a Web page author override _jspService () method?
JSP container creates _jspService() methods so it should not be overridden.
Why we Cannot override _jspService method?
Why ? Since what ever we wrote code in the JSP will be placed in _jspService() of generated servlet class(from JSP) . means _jspService() is already imlimented by us.So if we attempted to override _jspService() it will give a compilation error regarding the method _jspService() is already defined.
Can you explain lifecycle of JSP explain in detail?
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.
Can be used alternatively in JSP?
–comment–> and <%–comment–%> be used alternatively in JSP? Explanation: is an HTML comment. <%–comment–%> is JSP comment.
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.
Why is _jspService () method starting with an '_'?
_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 '_'. This is the reason why we don't override _jspService() method in any JSP page.
Which symbol is used to specify that the service method of JSP Cannot override?
_jspService(): It is the JSP method that gets invoked by JSP container for each client request bypassing request and response object. Notice that the method name starts with an underscore to distinguish it from other lifecycle methods as this method cannot be overridden.
Which of the following methods Cannot be overridden for an object of object class?
This article explains why it's important to implement these methods correctly and then explains how to do so. Object declares three versions of the wait method, as well as the methods notify , notifyAll and getClass . These methods all are final and cannot be overridden.
What is implicit objects in JSP?
These Objects are the Java objects that the JSP Container makes available to the developers in each page and the developer can call them directly without being explicitly declared. JSP Implicit Objects are also called pre-defined variables.
Why do we need JSP instead of Servlet?
Servlets can accept and process all type of protocol requests. JSP on the other hand is compatible with HTTP request only. In Servlet by default session management is not enabled, the user has to enable it explicitly. On the other hand in JSP session management is automatically enabled.
What are the lifecycle methods for JSP?
The Lifecycle of a JSP PageTranslation of JSP Page.Compilation of 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).More items...
What is the exact role of destroy () method?
Explanation: destroy() is an end of life cycle method so it is called at the end of life cycle.
What is an implicit object?
outis an implicit object and implicit objects are the local variables inside the _jspServicemethod, so implicit objects can be available only in _jspService() method and not within jspInit() or jspDestroy(). From jspInit() and jspDestroy() you can not access any implicit objects.
Is a response an implicit object?
response is also an implicit object. So u can not do that. Go through this link : stackoverflow.com/questions/138999/…
Is jspinit ok?
No,it is not ok. although the name of ur method is jspInit but it is not the life cycle method of jsp. the signature of the jsp life cycle method is :public void jspInit(){}.Do one thing, try to view the content of the generated .class file. It will clear ur confusion.
Is JSP out an object?
You can put it any where but it is typically declared as JSP declarations. out is an implicit object and implicit objects are the local variables inside the _jspService method, so implicit objects can be available only in _jspService () method and not within jspInit () or jspDestroy ().
