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Categories >> Software >> Java Related >> Java J2EE >> Servlets
 
 


 

 
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Question
Can we call destroy() method inside the init() method? What
happens when we do so?
 Question Submitted By :: Servlets
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
In the Servlet programming context, the destroy() method
can never be called by your code and is called by the
servlet container
 
Is This Answer Correct ?    19 Yes 5 No
Mani
 
Answer
# 2
This action does not disturb the normal life cycle flow of the servlet. The servlet will work normal. You may test the below code.

/**
* @author Suraj
*
*/
public class TestServlet extends HttpServlet {


public void init(ServletConfig config)throws ServletException{
super.init(config);
destroy();
}

protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {

System.out.println("I am test servlet.");
}

}

Web.xml
--------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Servlet</display-name>
<servlet>
<servlet-name>TestServlet</servlet-name>
<servlet-class>com.esspl.TestServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>TestServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>
------------------------------------
Test URL: http://<HOST>:<PORT>/<Context>/TestServlet.do
 
Is This Answer Correct ?    7 Yes 4 No
Suraj Kumar
 
 
 
Answer
# 3
Yes you can call a destroy() method in init() method, but
remember destroy() method will behave like normal method
but not as life-cycle method.
 
Is This Answer Correct ?    5 Yes 3 No
Ashwin Kumar J
 
Answer
# 4
a call to the destroy method will happen and the resources
will be released and the flow will continue as it is and
will throw an exception if the released resource is used
indie the service method call.
 
Is This Answer Correct ?    2 Yes 0 No
Ravikiran
 
Answer
# 5
One can call destroy method from init method. One scenario
in which you would like to call is some resource is looked
up once in init() method and cleaned in destroy() method. If
exception is thrown before it finishes as servlet is not
brought in service, container won't call destroy method. so
to keep resource clean you can call destroy() method from init()
 
Is This Answer Correct ?    3 Yes 1 No
Amitasite
 
Answer
# 6
if suppose we take the servlet programming side then
whenever u type the URL first web browser call the service
method then create the servlet object then call the
init()method whenever we call the init method start the
proceesses of the particular object operation suppose we
call the destroy()method before completion of the particular
object operation servelet object is removed then when we r
call the service method then create the servelet object
 
Is This Answer Correct ?    11 Yes 10 No
Poorna Chandar Rao.yerrabothu
 
Answer
# 7
a call to the destroy method will happen and the resources
will be released and the flow will continue as it is and
will throw an exception if the released resource is used
indie the service method call.
 
Is This Answer Correct ?    2 Yes 2 No
Ravikiran
 
Answer
# 8
In the servlet life cycle First our request calls to the
init()method,Inside it will doing some operations related
to the objects after that it will cal the destory() method
The destory()removes the servlet object,before calling to
service() method.
 
Is This Answer Correct ?    2 Yes 12 No
Srilatha
 
Answer
# 9
Yes you can call init method in destroy.
public void destroy(){
try {
init();
}
catch(Exception e){

}
}
 
Is This Answer Correct ?    11 Yes 25 No
Sunny
 

 
 
 
Other Servlets Interview Questions
 
  Question Asked @ Answers
 
how JSP can extend servlet or interface ...? IBM 3
What is difference between Forward() and sendRedirect() methode? Polaris 14
what is SSL?   2
How to set a cookie that is persisted only for the duration fo the clients session?   1
what is the difference between servlets and struts?   3
What is filter? Can filter be used as request or response?   1
What advantages do servlets have over CGI programs?   5
How threads are implemented in servlets?   3
What is a Session Id?   1
when the webcontainer creates ServeletConfig,ServletContext objects? befoure creating the Servlet object or not? TCS 4
What is HTTP Session ?   6
What is Single Threaded Model in Servlets? Explain this with an example? Wipro 10
 
For more Servlets Interview Questions Click Here 
 
 
 
 
 


   
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