Directives
Directives are messages to the container that are processed
at compilation time. The important
directives are:
<%@ page ... %>
<%@ include file =
"foo.html" %>
The important
page attributes are:
<%@ page import =
"..." %>
<%@ page extends =
"..." %>
<%@ page errorPage = "..." %>
<%@ page isErroPage = "..." %>
Handling Errors
error.jsp
<%@ page isErrorPage = "true" %>
<%@ page import = "java.io.*" %>
<html>
<head> <title> My Error Page </title> </head>
<body>
An error has occurred <br />
<%= exception.getMessage() %> <br />
<% exception.printStackTrace(new PrintWriter(out)); %>
</body>
</html>
thrower.jsp
<%@ page errorPage = "error.jsp" %>
<%!
void foo1() throws Exception { foo2();
}
void foo2() throws Exception { foo3();
}
void foo3() throws Exception { if
(true) throw new Exception("foo3 blew it!"); }
%>
<html>
<head><title> Throw Demo </title> </head>
<body>
I am going to throw an exception now:
<% foo1(); %>
</body>
</html>