help needed in understanding some code

[786snow]

Hi,
I am new to java servlet. I am trying to understand this code. Is init() function in java servlet is like a constructor it gets executed with out having to call that function.? and what is super.init, here i believe they are calling the init() function of the parent class?



public class EDocsServlet extends BaseServlet
{
public void init()
{
super.init();
customerAccessOnly = false;
}

protected RequestProcessor getRequestProcessor(Log log)
{
return new EDocsRequestProcessor(log);
}

protected WebController getWebController(EjbController ejbController, Log log)
{
return new EDocsWebController(ejbController, log);
}

protected EjbController getEjbController(Log log)
{
return new EDocsController(log);
}

}

 

[feherke]

Hi

You will have to specify what [tt]BaseServlet[/tt] is. I assume that it extends the [tt]HttpServlet[/tt] class. If so, then the [tt]init()[/tt] method overrides the [tt]GenericServlet.init()[/tt] method which is :

Called by the servlet container to indicate to a servlet that the servlet is being placed into service.

So no, is not like a constructor, is like an initializer.

The documentation also says :

A convenience method which can be overridden so that there's no need to call [tt]super.init(config)[/tt].

So if that code still calls [tt]super.init()[/tt], then it means something important is implemented in the [tt]BaseServlet[/tt] class. Again, we not know what that class is.

Feherke.

http://rootshell.be/~feherke/

 

[786snow]

thanks for your reply.

Yes BaseServlet extends HttpServlet

One question I have when you look at the public void init(), you see the declareation of three functions

protected RequestProcessor getRequestProcessor(Log log)
{
return new EDocsRequestProcessor(log);
}

protected WebController getWebController(EjbController ejbController, Log log)
{
return new EDocsWebController(ejbController, log);
}

protected EjbController getEjbController(Log log)
{
return new EDocsController(log);
}


Will it be true that any function that we declate in the
public void init(), will get executed on it its own because i see the declaration of these functions but not any code where we actually call these functions, as we do in other lauguages...

Thanks