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I was getting this error too, when i was working with this. I also heared from someone that it's better to use
This will hold good when u are sending the request parameters alone to the JSP.
Any way, i came across a difference in using both the methods
That is :
The servletRequest's getRequestDispatcher() can take a relative path while ServletContext's getRequestDispatcher() can not(can only take relative to the current context's root).
For example with ServletContext both -> request.getRequestDispatcher("./jsp/jsppage.jsp") - evaluated relative to the path of the request -> request.getRequestDispatcher("/jsp/jsppage.jsp") - evaluated relative to the root are all valid
with ServletContext only -> context.getRequestDispatcher("/jsp/jsppage.jsp") is valid but not context.getRequestDispatcher("./jsp/jsppage.jsp"). that is it can not evaluate a path other than context root.
But i would like to know the pros and cons of the methods....
Joined: Sep 08, 2004
Thanks, people..For now , I will use the ServletContext but hopefully some day I will know why request.getRequestDispacther did not work for me. Thanks for replying!
Joined: Aug 15, 2004
the error, you are gettin, looks like a compile time error. It doesn't mean that it didn't work, but its like why are you getting compile time error. wiered. [ September 23, 2004: Message edited by: adeel ansari ]
The difference between the getRequestDispatcher()method of ServletContext and that of ServletRequest is that you can pass a relative path to the getRequestDispatcher() method of ServletRequest but not to the getRequestDispatcher() method of ServletContext.
Like for instance request.getRequestDispatcher("../html/login.html") is valid,and the getRequestDispatcher() method of ServletRequest will evaluatethe path relative to the path of the request.
For the getRequestDispatcher() method of ServletContext, the path parameter cannot be relative and must start with /.
Why like this... because ServletRequest has a current request path to evaluate the relative path while ServletContext does not.