Hi! I have a very unnoying problem. In a J2EE application I use a "master JSP" as a template for generating predefined screens (the idea is borrowed from the demo application PetStore). This JSP includes several other JSPs (for the top, left side, right side, central, bottom positions). What JSPs should be included for a given view is defined for each screen in a configuration object. Okay, this is quite simple so far, and what is more, it is working fine. The problem arises when one decides to add error handling. If you add the <%@ page errorPage="errorpage.jsp" %> directive to an included page, and throw an exception from that page, the JSP container says that it cannot forward to the errorpage "as OutputStream or Writer has already been obtained" (throws a java.lang.IllegalStateException) This happens when you use the <jsp:include> tag, the one which enables you to use an expression for defining its "page" attribute. It is essential for us, since we want to say something like the following in our template.jsp: <jsp:include page="<%= currentScreen.get("TOP") %>" flush="true"> // My Tomcat in J2EE 1.2.1 says "flush="true" is obligatory in JSP 1.0" so I use it in this form This line would dinamically include the JSP defined in the actual "screen" for the topmost area in the template. So this would be fine, but it does not work. The whole thing works fine with the <%@ include file="file.jsp" %> tag. So this tag does what I really need: it glues all included JSPs together, parses them, greating one big JSP (one servlet finally), which uses a common errorpage, so when I throw an exception from one of the included JSPs, the error page gets called. The only problem is that this tag does not accept an expression, only a literal string, so you cannot say: <%@ include file="<%= currentScreen.get("TOP") %>" %> Rather annoying, isn't it? I would appreciate any kind of urgent help. Cheers, Janos. PS: I forgot to mention before, that I tested Sun's PetStore Demo application in this respect, and it _failed_ also... So JSP error handling does not work (!) in Sun's demo application, either.