Exception Handling in JSP

Introduction to Exception Handling in JSP

  • Exception is an event that arises during the execution of the program. It terminates the program abnormally.
  • Exception handling is the process of handling the abnormal termination of the program.
  • Exception handling in JSP is easier than Java technology. JSP also uses same exception class object.
There are two ways to perform Exception Handling in JSP:

1. Using isErrorPage and errorPage attribute of page directive.
2. Using <error-page> tag in Deployment Descriptor.

Example : Exception handling using isErrorPage & errorPage attribute

//result.jsp

<%@ page errorPage="error.jsp" %>  
<html>
    <head>
        <title>JSP Exception Handling</title>
    </head>
<body>
    <%
         int a = 46;
         int b = 0;
         int result = a/b ;
    %>
</body>
</html>

//error.jsp

<%@ page isErrorPage = "true" %>  
<html>
     <head>
          <title>Exception Page</title>
     </head>
<body>
     <h3>Sorry an exception occured!</h3>  
     Exception is: <%= exception %>  
</body>
</html>

Using try and catch Block

In JSP, we can also handle the exception by using try and catch block. It works on same page instead of firing an error page.

Example : Using try & catch block in JSP page for exception handling

<html>
      <head>
          <title>Exception handling in JSP using try catch blocks</title>
      </head>
<body>
   <%
      try
      {
          int arr[] = {9,8,7,6,5,4,3};
          int num = arr[10];
          out.println("11th element of arr"+num);
      }
      catch (Exception exp)
      {
          out.println("Cannot find the given index: " + exp);
      }
   %>
</body>
</html>

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