Caro,
por aparece o warning no Eclipse
Invalid location of tag (h1).
na linha
<h1>Menu Principal</h1>
%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!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>Menu Principal</title>
<h1>Menu Principal</h1>
</head>
<body>
<table width="75%" height="50" border="0" cellpadding="0" cellspacing="0">
<tr>
<td colspan="2">Escolha uma Opção </td>
</tr>
<tr></tr>
<tr></tr>
<tr>
<td>
<a >Lista de Clientes</a>
</td>
</tr>
<tr>
<td>
<a >Incluir de Cliente</a>
</td>
</tr>
<tr>
<td>
<a >Chama EJB Local</a>
</td>
</tr>
</table>
</body>
</html>