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JSTL Core c:catch Tag

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<c:catch> tag is used to handle the exceptions that can be raised by any of the tag which are located inside the body of the tag. The tag <c:catch> is member of core tag library of jstl.

The <c:catch> tag catches any throwable that occurs in the body of the tag. This tag is used to handle exception during run time.

Syntax For c:catch Tag

<c:catch> attributes> body content </c:catch>

The tag accepts the var attribute, which takes the name of the variable that stores the exception thrown.

Example of c:catch Tag

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<span style="font-size: 12px; line-height: 18px;"><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" </span>
<span style="font-size: 12px; line-height: 18px;">"http://www.w3.org/TR/html4/loose.dtd"></span>
<span style="font-size: 12px; line-height: 18px;"><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %></span>
<span style="font-size: 12px; line-height: 18px;"><html></span>
<span style="font-size: 12px; line-height: 18px;"><head></span>
<span style="font-size: 12px; line-height: 18px;"><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%></span>
<span style="font-size: 12px; line-height: 18px;"><html></span>
<span style="font-size: 12px; line-height: 18px;"><head></span>
<span style="font-size: 12px; line-height: 18px;"><title>JSTL c:catch Example</title></span>
<span style="font-size: 12px; line-height: 18px;"></head></span>
<span style="font-size: 12px; line-height: 18px;"><body></span>
	<c:catch var="CatchNullPointerException">
<span style="font-size: 12px; line-height: 18px;">		<% String str = null; str.trim(); %></span>
	</c:catch>
	<c:if test="${CatchNullPointerException != null}">
		<p>
			Exception is : ${CatchNullPointerException} <br />
		</p>
	</c:if>
</body>
</html>

How To Run?

  • Save this file as example.jsp in your eclipse IDE.
  • Now select this jsp file, right mouse click and select Run as ->Run on server

Output

When the execution process is completed successfully we will get the following output :
jstl_c catch tag_demo

Advantages of c:catch Tag

  • It is used to handle exception generated during run time.
  • This tag is used to capture any throwable exception that happens on the body of a page.

Previous Tutorial : JSTL Core Out Tag :: Next Tutorial : JSTL Core c:if Tag

About Krishna Srinivasan

He is Founder and Chief Editor of JavaBeat. He has more than 8+ years of experience on developing Web applications. He writes about Spring, DOJO, JSF, Hibernate and many other emerging technologies in this blog.