Contents

What are the JSP lifecycle methods?

  • 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)
What is the correct order of the JSP life cycle phases?

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

What are lifecycle methods in Java?

In Servlet first init() is called then service() and at last destroy() is called automatically when a servlet object is created. Activities in android have lifecycle methods onCreate() ,onStart(), onResume() etc which are automatically called when object of an activity come into existence.

What are the methods and phases of servlet life cycle?

Three methods are central to the life cycle of a servlet. These are init(),service() and destroy(). They are implemented by every servlet and are invoked at a specific time by the server.

What is JSP life cycle of JSP?

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.

How many stages 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.

What are directives in JSP?

Directives are elements that relay messages to the JSP container and affect how it compiles the JSP page. The directives themselves do not appear in the XML output. There are three directives: include, page, and taglib.

Which method in session tracking is used?

There are four techniques used in Session tracking: Cookies. Hidden Form Field. URL Rewriting.

Which of the following method can be used to read a form parameter in JSP?

JSP handles this type of requests using getParameter() method to read simple parameters and getInputStream() method to read binary data stream coming from the client.

How many lifecycle methods are provided by Java?

There are mainly three life cycle methods of a servlet, which we can describe as: init() service() destroy()

Which of the following methods are main methods in life cycle of servlet?

There are three life cycle methods of a Servlet : init() service() destroy()

Which life cycle method make Reddy the servlet for garbage collection?

The servlet is initialized by calling the init() method. The servlet calls service() method to process a client’s request. The servlet is terminated by calling the destroy() method. Finally, servlet is garbage collected by the garbage collector of the JVM.

What is the full form of JSP?

Jakarta Server Pages (JSP; formerly JavaServer Pages) is a collection of technologies that helps software developers create dynamically generated web pages based on HTML, XML, SOAP, or other document types. Released in 1999 by Sun Microsystems, JSP is similar to PHP and ASP, but uses the Java programming language.

What is the life cycle of a servlet can you call a JSP from the servlet difference between forward () method and send redirect () method?

forward() methodsendRedirect() method
The forward() method works at server side.The sendRedirect() method works at client side.
It sends the same request and response objects to another servlet.It always sends a new request.
What are the methods in Servlet?

MethodDescription
public void destroy()is invoked only once and indicates that servlet is being destroyed.
public ServletConfig getServletConfig()returns the object of ServletConfig.
public String getServletInfo()returns information about servlet such as writer, copyright, version etc.
What are the different types of JSP tags?

  • Directive Tag: Directive tags provide general information about the JSP page to the JSP engine. …
  • Declaration Tag: …
  • Scriptlet Tag: …
  • Expression Tag: …
  • Action Tag: …
  • Comment Tag:
What is JSP development model?

JSP Model 2 is a complex design pattern used in the design of Java Web applications which separates the display of content from the logic used to obtain and manipulate the content. Since Model 2 drives a separation between logic and display, it is usually associated with the model–view–controller (MVC) paradigm.

What are the key elements of JSP code?

  • Expression Tags.
  • Scriptlet Tags.
  • Declaration Tags.
How the JSP is processed explain each step in detail?

  1. Step 1: The client navigates to a file ending with the . …
  2. Step 2: If the compiled version of JSP exists in the web server, it returns the file. …
  3. Step 3: The JSP Engine loads the JSP file and translates the JSP to Servlet(Java code). …
  4. Step 4: The JSP engine compiles the Servlet to an executable . …
  5. Step 5: The .
What are the events in JSP page?

  • Summary of lifecycle events.
  • JSP page translation (validation, translation, compilation phases)
  • Load Class.
  • Instantiate.
  • jspInit method is called.
  • _jspService method is called.
  • jspDestroy method is called.
  • Important points to remember.
How many implicit objects are there in JSP?

There are 9 jsp implicit objects. These objects are created by the web container that are available to all the jsp pages. The available implicit objects are out, request, config, session, application etc.

What are the different types of JSP directives?

S.No.Directive & Description1<%@ page … %> Defines page-dependent attributes, such as scripting language, error page, and buffering requirements.2<%@ include … %> Includes a file during the translation phase.3<%@ taglib … %> Declares a tag library, containing custom actions, used in the page

What are JSP actions and directives?

JSP directives are the messages to JSP container. They provide global information about an entire JSP page. JSP directives are used to give special instruction to a container for translation of JSP to servlet code. In JSP life cycle phase, JSP has to be converted to a servlet which is the translation phase.

What are JSP directive elements?

JSP directives are the elements of a JSP source code that guide the web container on how to translate the JSP page into it’s respective servlet. Syntax : @ <%@ directive attribute = “value”%> Directives can have a number of attributes which you can list down as key-value pairs and separated by commas.

What are implicit objects in JSP?

JSP Implicit Objects are the Java objects that the JSP Container makes available to developers in each page and developer can call them directly without being explicitly declared. JSP Implicit Objects are also called pre-defined variables.

What is difference between cookies and session?

The main difference between a session and a cookie is that session data is stored on the server, whereas cookies store data in the visitor’s browser. Sessions are more secure than cookies as it is stored in server. Cookie can be turned off from browser.

What is the role of JSP in MVC model?

JSP plays the role of presentation of the data and controller. It is an interface between model and view while model connects both to the controller as well as the database. Main business logic is present in the model layer.

How can we call a method in JSP?

  1. Inside the <%code fragment%> scriptlet use the request object, that is an instance of a javax. …
  2. Use the getMethod() API method of javax. …
  3. Use the getRequestURI() API method of javax.
In which element can methods be declared in a JSP page?

Declaration tag is one of the scripting elements in JSP. This Tag is used for declare the variables. Along with this, Declaration Tag can also declare method and classes.

Which method is used to retrieve a form value in a JSP or servlet?

getParameter() – Passing data from client to JSP The request. getParameter() is being used here to retrieve form data from client side.

What are the applets life cycle methods explain them?

The applet life cycle can be defined as the process of how the object is created, started, stopped, and destroyed during the entire execution of its application. It basically has five core methods namely init(), start(), stop(), paint() and destroy(). These methods are invoked by the browser to execute.

Which of the following are applet life cycle methods?

  • init()
  • start()
  • paint()
  • stop()
  • destroy()
Which method is called only once in Servlet life cycle Mcq?

A – The destroy() method is called only once at the end of the life cycle of a servlet.

What are doGet and doPost methods in Servlet?

The doGet() method is used for getting the information from server while the doPost() method is used for sending information to the server.

Which of the following is not a JSP directive?

Explanation: command directive is not a directive in JSP.

What is JSP page in Java?

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.

What is the difference between servlets and JSP Mcq?

Servlet can accept all protocol requests, including HTTP, while JSP can only accept HTTP requests. In MVC architecture, servlet works as a controller while JSP works as a view for displaying output. … Whereas in JSP, business logic is split from presentation logic using JavaBeans.

When servlet destroy method is called?

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.

What is true about initialization phase in JSP life cycle?

Q 24 – Which of the following is true about Initialization phase in JSP life cycle? A – When a container loads a JSP it invokes the jspInit method before servicing any requests. B – Container invokes _jspService method during Initialization phase.

What is JSP technology?

JavaServer Pages (JSP) is a technology for developing Webpages that supports dynamic content. … A JavaServer Pages component is a type of Java servlet that is designed to fulfill the role of a user interface for a Java web application.