Exception handling in JSP


✔ JSP CHAPTERS:-

1. JSP Overview
2. JSP Hello World Example
3. JSP Scriplet Tag
4. JSP Declaration Tag
5. JSP Expression Tag
6. JSP Comment Tag
7. JSP Directives
8. JSP Implicit Objects
9. JSP Action Tags
10. Exception Handling
11. JSP Expression Language



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Exception handling is a mechanism to handle run time errors, so that normal flow of the program can be maintained.

Ways of exception handling in JSP:

  1. 1. Using page directive (errorPage and isErrorPage attributes).
  2. 2. Using attribute of web.xml.

Exception handling example using errorPage and isErrorPage attributes:

welcome.jsp
<%@ page errorPage="errorPage.jsp" %>  
 
<html>
 <head>
   <title>isErrorPage and errorPage page directive example</title>
 </head>
 <body>
  <%= 0/0 %>
 </body>
</html>
errorPage.jsp
<%@ page isErrorPage="true" %>  
 
<html>
 <head>
   <title>isErrorPage and errorPage page directive example</title>
 </head>
 <body>
                <h3>Hello this is an isErrorPage and 
                    errorPage page directive example.</h3>
  <br/>
  <h3>Some exception occurred.</h3>
  Exception: <%=exception %>
 </body>
</html>
web.xml
<web-app>
 
  <welcome-file-list>
          <welcome-file>welcome.jsp</welcome-file>
  </welcome-file-list> 
 
</web-app>

Output:


Exception handling example using attribute:

welcome.jsp
<html>
 <head>
  <title>Exception handling example</title>
 </head>
 <body> 
  <% 
   out.print(10/0); 
  %>
 </body>
</html>
errorPage.jsp
<%@ page isErrorPage="true" %>
 
<html>
 <head>
  <title>error page</title>
 </head>
 <body> 
  Occurred exception is: <%= exception %>  
 </body>
</html>
web.xml
<web-app>
 
  <error-page>  
   <exception-type>java.lang.Exception</exception-type>  
   <location>/error.jsp</location>  
  </error-page> 
 
  <welcome-file-list>
    <welcome-file>welcome.jsp</welcome-file>
  </welcome-file-list>
</web-app>

Output:


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