Christophe Verré wrote:<!-- <jsp:useBean id="person" type="com.examples.Person" class="com.examples.Employe"> -->
These are HTML comments, but the JSP container will translate the JSP part of it. So you are already declaring a bean named "person" here.
Then you declare another one (the part without comments), where the error happens.
So remove those HTML comments, or change them into JSP comments.