Question

What is the difference between init() and init(servletconfig) ?

Asked by: haneefnb

What is the difference between init() and init(servletconfig) ?

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Asked On
2009-06-16 at 04:06:16ID24495070
Tags

servlets

Topic

Java Servlets

Participating Experts
2
Points
500
Comments
4

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Answers

 

by: ksivananthPosted on 2009-06-16 at 04:27:48ID: 24636896

both the mehtods are called by the servlet container, the later is just an convenient method. if you want to hold a handle for ServletConfig for later use, you can override init(servletconfig) but be aware, you should invoke super.init(servletconfig).
even if you just override init(), you can get the reference of ServletConfig by invoking getServletConfig(). just your choice!

 

by: haneefnbPosted on 2009-06-16 at 04:48:31ID: 24637009

thank u
but we already have getServletConfig() method for getting servletconfig object, so why we go for init(servletconfig), what is the difference b/w both the cases?

 

by: ksivananthPosted on 2009-06-16 at 04:51:36ID: 24637021

>>so why we go for init(servletconfig)

no need to, as I said earlier, its just a convenient method so that you need to call getServletConfig

>>what is the difference b/w both the cases?

there are no diffs  as a developer. you can override init(servletconfig) but be aware, you should invoke super.init(servletconfig).

 

by: Ravi_KallaPosted on 2009-06-16 at 22:46:06ID: 24645141

The implementation of "init(ServletConfig)" and "init(ServletConfig)" is as above.
init(ServletConfig) is mainly there for setting the class variable "config" with the ServletConfig object and will be called by the container.
So, if u want anything to be done while initializing the servlet, it should be preferably done in init().

class GenericServlet implements Servlet...{ 
 private transient ServletConfig config; 
 public void init(ServletConfig servletconfig) throws ServletException {
  config = servletconfig;
  init();
 } 
 public void init(ServletConfig servletconfig) throws ServletException {
  //some code here
 } 
 public ServletConfig getServletConfig() {
  return config;
 }
 //some more methods here
} 

                                              
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