Java constants in JSP

class Constants {
    public static final String ATTR_CURRENT_USER = "current.user";
}

<%@ page import="com.example.Constants" %>
<%= Constants.ATTR_CURRENT_USER %>

servletContext.setAttribute("Constants", com.example.Constants);

<c:out value="${Constants.ATTR_CURRENT_USER}"/>

<dependency>
		<groupId>jakarta</groupId>
		<artifactId>jakarta-taglibs-unstandard</artifactId>
		<version>20060829</version>
	</dependency>

current.user