How to handle an exception in JSP?

The <c:catch> tag catches any Throwable that occurs in its body and optionally exposes it. It is used for error handling and to deal more gracefully with the problem.

Attribute

The <c:catch> tag has the following attributes −

Attribute	Description	Required	Default
var	The name of the variable to hold the java.lang.Throwable if thrown by elements in the body.	No	None

Example

<%@ taglib uri = "https://java.sun.com/jsp/jstl/core" prefix = "c" %>
<html>
   <head>
      <title><c:catch> Tag Example</title>
   </head>
   <body>
      <c:catch var ="catchException">
         <% int x = 5/0;%>
      </c:catch>
      <c:if test = "${catchException != null}">
         <p>The exception is : ${catchException} <br />
         There is an exception: ${catchException.message}</p>
      </c:if>
   </body>
</html>

The above code will generate the following result −

The exception is : java.lang.ArithmaticException: / by zero
There is an exception: / by zero