JSP Exception Handling
Before going to JSP exception handling, first we have to understand what is an exception and how it is different from errors.
Exception:An unwanted or unexpected event that interrupts the normal flow of execution is known as exception. Exception is a disadvantageous fact. So we have to handle exceptions in order to graceful termination of the program.
Error:It can be a issue with the code or a system related issue which are irrecoverable.
JSP provide 3 different ways to perform exception handling:
1. Using isErrorPage and errorPage attribute of page directive.
2. Using < error-page > tag in Deployment Descriptor.
3. Using simple try...catch block.
Example of isErrorPage and errorPage attribute isErrorPage attribute in page directive officially appoints a JSP page as an error page.
error.jsp
errorPage attribute in a page directive informs the Web Container that if an exception occurs in the current page, forward the request to the specified error page.
sum.jsp
Whenever an exception occurs in sum.jsp page the user is redirected to the error.jsp page, where either you can display a nice message, or you can also print the exception trace into a file/database in the background, to check later what caused the error.
Declaring error page in Deployment Descriptor
You can also declare error pages in the DD for the entire Web Apllication. Using < error-page > tag in the Deployment Descriptor. You can even configure different error pages for different exception types, or HTTP error code type(503, 500 etc).
Declaring an error page for all type of exception
<error-page> <exception-type>java.lang.Throwable</exception-type> <location>/error.jsp</location> </error-page>
Declaring an error page for more detailed exception
<error-page> <exception-type>java.lang.ArithmeticException</exception-type> <location>/error.jsp</location> </error-page>
Declaring an error page based on HTTP Status code
<error-page> <error-code>404</error-code> <location>/error.jsp</location> </error-page>
Using the try...catch block
Using try...catch block is just like how it is used in Core Java.
<html> <head> <title>Try...Catch Example</title> </head> <body> <% try{ int i = 100; i = i / 0; out.println("The answer is " + i); } catch (Exception e){ out.println("An exception occurred: " + e.getMassage()); } %> </body> </html>
About the Author
Silan Software is one of the India's leading provider of offline & online training for Java, Python, AI (Machine Learning, Deep Learning), Data Science, Software Development & many more emerging Technologies.
We provide Academic Training || Industrial Training || Corporate Training || Internship || Java || Python || AI using Python || Data Science etc
PreviousNext
Join our newsletter for the latest updates.
About us
Our Services
Contact Us
Our Courses
Learn Python | Learn AI | Learn Machine Learning | Learn Deep Learning | Learn Core Java | Learn Java JSP | Learn Java Servlet | Learn Java Spring Core | Learn Spring Boot | Learn Power BI | Learn DAA | Learn HTML | Learn SQL | Learn C Programming | Learn Bootstrap | Learn Git | Learn JavaScript | Learn Data Structure Using C | Learn RDBMS | Learn Data Science | Learn PHP
Our Tutorials
Python Tutorial | AI Tutorial | Machine Learning Tutorial | Deep Learning Tutorial | Core Java Tutorial | Java JSP Tutorial | Java Servlet Tutorial | Java Spring Tutorial | Spring Boot Tutorial | Power BI Tutorial | DAA Tutorial | HTML Tutorial | SQL Tutorial | C Programming Tutorial | Bootstrap Tutorial | Git Tutorial | JavaScript Tutorial | Data Structure Using C Tutorial | RDBMS Tutorial | Data Science Tutorial | PHP Tutorial
Copyright © 2023 Pythontpoint Powered by Silan Software Pvt. Ltd. All rights reserved.