HELP! - BEAN and CLASS interchange?

Question

When I setup to a bean like:
<jsp:useBean id="logger" scope="application" class="Logger" />
I can use the bean and bean's functions fine in the JSP, but not within functions that exist in the JSP like:
jspInit()
it says the "logger" is undefined. Is there a way I can access the logger function within the jspInit class or do i have to redefine a new instance of "logger" within jspInit().
The whole point is I would like to use the same instance of the class from all the JSPs. Thats what scope=application seems to do instead of instantiating everytime.
P.S. If I were to instantiate a class like:
Logger logger = new Logger;
would I be able to give it "applicate scope"? like a bean can have?
Really long question, thanks a lot for the help. :)

Answer 1

Hi yusufm1,
I can use the bean and bean's functions fine in the JSP, but not within functions that exist in the JSP like:
jspInit()it says the "logger" is undefined.
What ever you write in jsp, other than in <%! %> tags, is a part of _jspService() method. The life cycle of jsp has following 3 steps.
1. jspInit()
2. _jspService()
3. jspDestroy()
jspInit() is the first method of the jsp class that is executed. _jspService is the next method. The statement -
<jsp:useBean id="logger" scope="application" class="Logger" />
instantiates a bean in _jspService() method of jsp class. So it is evident that this instance is not available in jspInit().method.
Is there a way I can access the logger function within the jspInit class or do i have to redefine a new instance of "logger" within jspInit().
To use the bean instance in jspInit() you should instantiate the bean object in jspInit() or declare it as an instance variable.
If I were to instantiate a class like:
Logger logger = new Logger;
would I be able to give it "applicate scope"? like a bean can have?
No, simply instantiating a class in the jspInit() method wouldnot provide it with application scope. You have to put that instance in ServletContext (application) to make it available to all jsp pages. If you instantiate a class in jspInit() only and donot put it in application it is not even available to _jspService() method.
Hope this helps