Crear nuestra propia página de error

<%@ page language="java" isErrorPage="true" %> 
<!DOCTYPE HTML PUBLIC "-//w3c//dtd html 4.0 transitional//en"> 
<html> 
<head> 
<title>Página de error</title> 
</head> 
<body bgcolor="#FFFFFF"> 
<div>¡Se ha producido un error!</div> 
 
<h1>Atributo de consulta</h1> 
<div class="consultaAttributs"> 
<% 
  java.util.Enumeration en= request.getAttributeNames(); 
  while (en.hasMoreElements()) { 
    String name = (String) en.nextElement(); 
    if(request.getAttribute(name) == null) { 
      %> 
      <div><%=name%>=null</div> 
      <% 
    } else { 
      %> 
      <div><%=name%>=<%=request.getAttribute(name).toString()%></div> 
      <% 
    } 
  } 
%> 
</div> 
 
<div class="consultaParameters"> 
<% 
en = request.getParameterNames(); 
while (en.hasMoreElements()) { 
  String name = (String) en.nextElement(); 
  if(request.getParameter(name) == null) { 
    %> 
    <div><%=name%>=null</div> 
    <% 
  } else { 
    %> 
    <div><%=name%>=<%=request.getParameter(name).toString()%></div> 
    <% 
  } 
} 
%> 
</div> 
 
 
<h1>Excepción</h1>
<div> 
<% 
Throwable th = pageContext.getException(); 
if(th != null) { 
  printRecursiveException(out,th); 
} 
%> 
</div> 
 
<%! 
public void printRecursiveException(JspWriter out, Throwable th) throws java.io.IOException { 
  out.println("<div>" + th.getClass().getName() + ":" + th.getMessage() + "</div>"); 
  StackTraceElement ste; 
  for(int x=0;x < th.getStackTrace().length;x++) { 
    out.println("<div>" + th.getStackTrace()[x].toString() + "</div>"); 
  } 
 
  Throwable parent = th.getCause(); 
  if(parent != null) { 
    out.println("<div class=\"parentCause\">"); 
    printRecursiveException(out,parent); 
    out.println("</div>"); 
  } 
} 
%> 
</body> 
</html>