Declaring Methods within JSP Pages

Q

How can I declare methods within my JSP page?

✍: FYICENTER.com

A

You can declare methods for use within your JSP page as declarations. The methods can then be invoked within any other methods you declare, or within JSP scriptlets and expressions.

Do note that you do not have direct access to any of the JSP implicit objects like request, response, session and so forth from within JSP methods. However, you should be able to pass any of the implicit JSP variables as parameters to the methods you declare.

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Can I stop JSP execution while in the midst of processing a request? Yes. Preemptive termination of request processing on an error condition is a good way to maximize the throughput of a high-volume JSP engine. The trick (asuming Java is your scripting language) is to use the return statement when y... 2007-04-03, 5042👍, 0💬

Setting Session Timeout Period
Is there a way I can set the inactivity lease period on a per-session basis? Typically, a default inactivity lease period for all sessions is set within your JSPengine admin screen or associated properties file. However, if your JSP engine supports the Servlet 2.1 API, you can manage the inactivity ... 2007-04-03, 5041👍, 0💬

Referencing "this" variable in JSP Pages
Is there a way to reference the "this" variable within a JSP page? Yes, there is. Under JSP 1.0, the page implicit object is equivalent to "this", and returns a reference to the servlet generated by the JSP page. 2007-04-03, 4962👍, 0💬

Overriding JSP Methods
What JSP lifecycle methods can I override? You cannot override the _jspService() method within a JSP page. You can however, override the jspInit() and jspDestroy() methods within a JSP page. jspInit() can be useful for allocating resources like database connections, network connections, and so forth... 2007-04-03, 4895👍, 0💬

Stoping Errors Displayed on JSP Pages
How do you restrict page errors display in the JSP page? You first set "Errorpage" attribute of PAGE directory to the name of the error page (ie Errorpage="error.jsp") in your jsp page. Then in the error jsp page set "isErrorpage=TRUE". When an error occur in your jsp page it will automatically call... 2007-04-03, 4884👍, 0💬

Handling Run-Time Exceptions
How does JSP handle run-time exceptions? You can use the errorPage attribute of the page directive to have uncaught runtime exceptions automatically forwarded to an error processing page. For example: redirects the browser to the JSP page error.jsp if an uncaught exception is encountered during requ... 2007-04-03, 4826👍, 0💬

Browser Redirect in JSP Pages
How do I perform browser redirection from a JSP page? You can use the response implicit object to redirect the browser to a different resource, as: response.sendRedirect("http:// interview.fyicenter.com/"); 2007-04-03, 4807👍, 0💬

Declaring Methods within JSP Pages
How can I declare methods within my JSP page? You can declare methods for use within your JSP page as declarations. The methods can then be invoked within any other methods you declare, or within JSP scriptlets and expressions. Do note that you do not have direct access to any of the JSP implicit ob... 2007-04-03, 4803👍, 0💬

Sharing an HttpSession between JSP and EJB
Is it possible to share an HttpSession between a JSP and EJB? What happens when I change a value in the HttpSession from inside an EJB? You can pass the HttpSession as parameter to an EJB method, only if all objects in session are serializable. This has to be consider as "passed-by-value", that mean... 2007-04-03, 4766👍, 0💬

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