Remove tag is being used in JSP to remove the variable from the scope.The <c:remove> tag removes a variable from either a specified scope or the first scope where the variable is found (if no scope is specified). This action is not normally particularly helpful, but it can aid in ensuring that a JSP cleans up any scoped resources it is responsible for.
JSTL <c:remove> tag Example:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>JSTL c remove Tag example</title>
</head>
<body>
<c:set var="salary" scope="session" value="${100000}"/>
<p>Before Remove Value: <c:out value="${salary}"/></p>
<c:remove var="salary"/>
<p>After Remove Value: <c:out value="${salary}"/></p>
</body>
</html>
As you can see above, <c:set> tag creates a new variable salary with value of 100000 and having scope for the current session. When tag <c:out> is used to print the value, first time it will print 100000
In line 3, <c:remove> tag is removing the variable salary from the session scope. In line 4, when <c:out> tag is printing value of variable salary, it will not print anything as it is removed in line 2.
