Error Handling in JSP Bean and Servlet

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Web tier: servlets, JSP, Web frameworks: Error Handling in JSP Bean and Servlet

  1. Error Handling in JSP Bean and Servlet (1 messages)

    Hi ,
       I need a suggestion. I am in the proces of designing
    the web application using MVC pattern. And currently I
    am designing a frame for our project.
    one of the component of our frame work is error manager.
    The functionality of the error manager is to catch any java language
    exceptions and display a user defined error accrodingly. The user defined
    error are stored in DB.

    how do I achive this?
    Get the error msg and display it to user at any point of time.

    situation is as follows
    1 Assume I have 8 pages to show and each page should be filled in before proceding to
    next page. Say for example I got a Business rule validation erro in 5th page how
    do I do this?

    Please help me??


    regards
    Sanjeev
  2. Sanjeev,

    Here is one possible solution:

    Say you have page1.jsp, page2.jsp,... page8.jsp

    In each one of the JSP pages, preceeding all code that could potentially throw an exception, you can define the following directive:

    <%@ page errorPage="myerror.jsp" %>

    You will then need to define myerror.jsp page. That JSP page might look something like this:

    <%@ page language="java" contentType="text/html" %>
    <%@ page isErrorPage="true"%>

    <html>
    <body>
    <h1>Houston we have a problem...</h1>
    Say whatever else you want to say about how sorry you are that this error occured :)
    The exception object is also available in this page, you can get at it as follows:
    <%= exception.getMessage() %>
    Since you say that you would like to display more user friendly messages, you'd somehow have already mapped these exceptions that you anticipate and have a corresponding message in the DB. Rather than displaying the exception message itself, you can now retrieve the error code from the database.

    There is also a way of determining which page caused this error page to be invoked.

    </body>
    </html>

    I can think of another way of doing this as well, using an exception handler class of sorts...

    Hope that helps

    Raj