There are two steps to create a custom function for JSP: Declare the function in the TLD: <?xml version="1.0" encoding="UTF-8" ?> <taglib... Implement the function (must be static): package com.example; public class UrlTransl... To use the function: <%@ taglib uri="http://www.example.com/jsp/tags" p...

Spring MVC 3.1 can send either JSON or HTML response on the same URL, depending on the type of response requested. With this mechanism, a page can be sent when directly requested from a link, but a JSON response can be sent in response to an AJAX request. This is the controller code: package com.example; import java.util.Map; ... In the above example, JSON response will be sent when the HTTP request contains header "Accept: application/json". HTML response will be sent then the header is "Accept: */*", or "Accept: text/html", or anything else. You can add a limitation that the HTML response does not produce "application/json". But then the question is which response will be sent when the HTTP header is "Accept: */*"? Both methods will...

After a user resets a password, I want to force the user to change the password before she gets access to secured content. This is usually done with a servlet filter. But with Spring MVC, you can also use a HandlerInterceptor . According to Spring JavaDoc: HandlerInterceptor is basically similar to a Servlet 2.3 Filter, but in contrast to the latter it just allows custom pre-processing with the option of prohibiting the execution of the handler itself, and custom post-processing. Filters are more powerful, for example they allow for exchanging the request and response objects that are handed down the chain. Note that a filter gets configured in web.xml, a HandlerInterceptor in the application context. As a basic guideline, fine-grained handler-related preprocessing tasks are candidates...

Thanks Dr.Xi, I was having a tough time changing the deployment context path of my web-app using the so-called context.xml file under /META-INF, it dint work (tomcat documentation at http://tomcat.apache.org/tomcat-6.0-doc/config/context.html , seemed pretty sure it would :() But I have one question, as changing server.xml is too instrusive for every web-app you build, is there any other way of pushing this configuration to one of the application specific files ? thanks, Venky

The landing page after login can be configured with the default-target-url attribute of form-login . If a user was redirected to the login form after requesting a restricted URL, she's redirected to the original requested page after successful login. An easy configuration looks like this: <beans:beans xmlns="http://www.springframework.org... But there are times that you want to do more initialization after login (such as loading user data), or apply more complex logic before redirecting. This is where the authentication-success-handler-ref attribute comes into play. You create a class that implements org.springframework.security.web.authentication.AuthenticationSuccessHandler and use that as the authentication-success-handler-ref : <http entry-point-ref="authProcessFilterEn... This is a skeleton implementation: public class MyAuthenticationSuccessHandler implem...

Some example snippets for Spring message configuration and usage. To configure a message source in Spring context (basename=messages): <bean id="messageSource" class="org.springf... Locale change interceptor can also be setup with: <?xml version="1.0" encoding="UTF-8"?> <beans x... The messages file should be named messages.properties (or messages_en.properties , etc.) and located on CLASSPATH , for example: WEB-INF/classes . To use a message resource in JSP: <%@ taglib prefix="spring" uri="http://www.springf...

This iptables rule redirects all port 80 traffic from subnet 192.168.0.0/24 to 192.168.0.1 running HTTP proxy (say squid): /usr/sbin/iptables -t nat -A PREROUTING -s 192.168... Make any packets destined to port 3256 on firewall be NAT'ed to internal system server on port 80: iptables -t nat -I PREROUTING -s ! 192.168.2.0/24 ... To make internal web server work for clients from the internet, LAN and the firewall itself: Make all packets from the Internet going to port 80 on the firewall ( $INET_IP ) to be redirected (or DNAT'ed) to the internal HTTP server ( $HTTP_IP ): iptables -t nat -A PREROUTING --dst $INET_IP -p tc... SNAT the packets entering the firewall that are destined for $HTTP_IP (internal HTTP server) port 80 so that they...

When you insert an attribute in JSP: <%@ taglib uri="http://tiles.apache.org/tags-tiles... you must define the attribute in tiles definitions: <definition name="/home" template="/WEB-INF/templa... Otherwise you'll get runtime exception. The ignore attribute, which defaults to false , will suppress the runtime exception when the attribute is not defined in tiles definition: <%@ taglib uri="http://tiles.apache.org/tags-tiles...

Dojo ShrinkSafe: http://shrinksafe.dojotoolkit.org/ : command line utility written in Java, based on Rhino - JavaScript engine written in Java. Douglas Crockford's JSMIN: http://crockford.com/javascript/jsmin : command line utility written in C, can download MS-DOS exe. Dean Edwards' Packer: http://dean.edwards.name/packer/ : online tool, or .NET, Perl, PHP application. YUI Compressor: http://developer.yahoo.com/yui/compressor/ : command line utility written in Java. Google Closure Compiler : command line Java application, web application, or RESTful API. One problem is, the compressor utility may not be 100% reliable. So make sure to test the compressed script.

flowplayer is another way to embed Flash in a web page. The code looks like this: <object width="6400" height="380" data="swf/flowpl... You need to download two swf files: http://releases.flowplayer.org/swf/flowplayer-3.2.1.swf http://releases.flowplayer.org/swf/flowplayer.controls-3.2.0.swf