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The errorPage Attribute of page Directive In JSP
Posted on: February 6, 2008 at 12:00 AM

This section illustrates you about the errorPage attribute of the page directive in JSP.

The errorPage Attribute of page Directive In JSP

This section illustrates you about the errorPage attribute of the page directive in JSP. This attribute sets a url (relative path starting from the "/" which refers from the root directory of your JSP application). If any exception is generated the the attribute refers to the file which is mentioned in the given url. If you do not specify the url then the attribute refers to the current page of your JSP application if any exception generated.

Here, this section provides the two JSP files these are:

ErrorPageAttribute.jsp
error.jsp

About the ErrorPageAttribute.jsp page:

This page show a simple text box in which you have to enter a number and a button which is used for submission the html form and divided the entered number by 0 (Zero) i.e. the cause of generating an error and the page is redirected to the specified file name which is mentioned as the value of the errorPage attribute of the page directive.

About the error.jsp page:

This page shows the error generated in the calling JSP page because of dividing the entered number by zero or any type of the error when the value of the isErrorPage attribute is set with the true value.

Here is the code of the ErrorPageAttribute.jsp page:

<%@page errorPage="error.jsp" %>
    <html>
	<head><title>Showing Error Page.</title></head>
	<body>
		<form method="post">
			<table border="0" cellspacing="0" cellpadding="0">
				<tr>
					<td>Enter a number: </td>
					<td><input type="text" name="txtNum" />
				</tr>
				<tr>
					<td>&nbsp;</td>
					<td><input type="submit" name="B1" value=
"Divide by zero" />
				</tr>
			</table>
		</form>
		<%
			if(request.getParameter("txtNum") != null){
				if(!request.getParameter("txtNum").equals("")){
					int div = Integer.parseInt(request.
getParameter("txtNum")) / 0;
					out.println("Answer is: " + div);
				}			
				else{
					out.println("<html><font color=red>Please
 enter a number.</font></html>");
				}
			}
		%>
	</body>
</html>

Output for the ErrorpageAttribute.jsp page:

Here is the code of the error.jsp page:

<%@page isErrorPage="true" %>
      <html>
	<head><title>Error Page.</title></head>
      <body bgcolor="blue">
		<font size="16" color="white">Your page generated
 an error:"<br/>
		Exception:<br/></font>
		<%= exception.toString() %>
	</body>
</html>

Output for the error.jsp page:

Download ErrorPageAttribute.jsp file.

Download error.jsp file.

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