Can we override the JSP lifecycle methods?

Can we override the JSP lifecycle methods?

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

What are the JSP lifecycle methods?

Life cycle of JSP

• Translation of JSP page to Servlet.
• Compilation of JSP page(Compilation of JSP into test.
• Classloading (test.
• Instantiation(Object of the generated Servlet is created)
• Initialization(jspInit() method is invoked by the container)
• Request processing(_jspService()is invoked by the container)

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.

How can one JSP communicate with Java file?

Wherein an object will be communicated to a JSP from a Servlet….Following are the steps in Servlet JSP Communication:

1. Servlet instantiates a bean and initializes it.
2. The bean is then placed into the request.
3. The call is then forwarded to the JSP page, using request dispatcher.

How can you pass information from one JSP to included JSP?

Explanation: <%jsp:param> tag is used to pass information from JSP to included JSP.

Which JSP life cycle is in correct order?

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

How many phases are there in JSP life cycle?

Let’s learn different phases of JSP Life Cycle Compilation process of JSP page involves three steps: Parsing of JSP. Turning JSP into servlet. Compiling the servlet.

How JSP is compiled?

The Java class created from each JSP implements Servlet . Then, the Java code goes through the same cycle it normally does. Still at run time, it is compiled into bytecode and then into machine code. Finally, the JSP-turned-Servlet responds to requests like any other Servlet.

Why is _jspService () method starting with an ‘_’ While other life cycle methods do not?

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 ‘_’.

Which one of the following is correct for directive in JSP?

Which one of the following is correct for directive in JSP? Explanation: Directive is declared as <%@directive%>.

How can we create a web application using JSP and servlet?

Servlet and JSP Tutorial: Steps to Create Servlet

1. Create a directory structure.
2. Create a Servlet.
3. Compile the Servlet.
4. Add mappings to the web. xml file.
5. Start the server and deploy the project.
6. Access the servlet.

What are the steps involved in JSP life cycle?

Following steps are involved in the JSP life cycle: We can override jspInit (), jspDestroy () but we can’t override _jspService () method. This is the first step of the JSP life cycle. This translation phase deals with the Syntactic correctness of JSP. Here test.jsp file is translated to test.java.

Can We override _jspservice() method in JSP?

We can override jspInit (), jspDestroy () but we can’t override _jspService () method. This is the first step of the JSP life cycle. This translation phase deals with the Syntactic correctness of JSP. Here test.jsp file is translated to test.java. Here the generated java servlet file (test.java) is compiled to a class file (test.class).

What is the JSP destruction phase?

The destruction phase of the JSP life cycle represents when a JSP is being removed from use by a container. The jspDestroy () method is the JSP equivalent of the destroy method for servlets.

How to remove JSP from the use of the container?

In order to remove the JSP from the use by the container or to destroy the method for servlets jspDestroy ()method is used. This method is called once, if you need to perform any cleanup task like closing open files, releasing database connections jspDestroy () can be overridden.