Introducing Technowobble!

Technowobble is my place to post interesting stuff related to technology in general.

Right now I'm spending time looking into Spring integration with Google Web Toolkit (GWT) in combination with Google App Engine (GAE) and fibbling with my brand new Mac Mini - which is hooked up to my Samsung flatscreen and only accessed through my Iphone (no keyboard, no mouse!).

Another thing catching my tech-attention right now is Spring Roo - I wonder what will be?

Happy reading!

GWT and Spring Security

Update! - Based on the post below, and my other post regarding Spring Security and OpenID, I have added Open-ID support to the sample application below. For those interested, here's the write-up of changes. I've spent quite some time digging into ways of integrating GWT and Spring Security. It all started by reading the following post in the GWT Forum - Best practices/ideas for GWT with Spring Security (or equivalent) , and then checking out this blog - GWT and Spring Security . To make matters worse, I started reading Security for GWT Applications and specifically about the "Cross-Site Request Forging"-attacks. Now, what could I do about it? Well, starting by setting up my own project (Maven-based) with all updated dependencies (GWT 2.0.3 etc) and started reading the Spring Security Reference Documentation (puh!). Instead of See Wah Cheng's approach of implementing a custom authentication service, I decided to rely on standard namespace configuration

GWT and Open-ID using Spring Security

In this post I'll combine the GWT and Spring Security integration from http://technowobble.blogspot.com/2010/05/gwt-and-spring-security.html and the Open-ID using Spring Security from http://technowobble.blogspot.com/2010/06/using-spring-securitys-openid.html . I'm assuming you've read them before reading further... :) I was also inspired by http://www.sociallipstick.com/?p=86 and http://code.google.com/p/dyuproject/wiki/OpenidLoginWithoutLeavingPage to get this working with a pop-up as my sample application is based on GWT - hence, I don't want to direct the user to another page and loose the application state etc. I'm also showing how to exchange Open-ID attributes with e.g. Google. As with the previous blogposts, the sample application is runnable on Google App Engine. With no further ado, this is basically what is needed to add Open-ID support to my previous sample application: From my second post, add Openid4javaFetcher, MyHttpCacheProvider and OpenI

A quick note on something that's been bugging me while using SpringSource STS with the GWT-plugin on my MacBook Pro... Sometimes, when shutting down the internal devmode server I get an error dialog saying it wasn't able to shut down the process fully (even though it looks shut down in the console window). When starting it again, it reports port 9997 to be in use already - and consequently fails to start up again. I haven't found a way to find the process within SpringSource STS, even though there are probably several ways of doing it (which I do not know about). Anyhow - I solved it using the " lsof " package (List Open Files). To find the PID of the process using port 9997, type "lsof -i :9997" in a Terminal window. A simple "kill -9 &ltpid&gt" will take care of the rest. I'm not sure if this happens on other platforms etc, but at least, now you know how to handle it if it hits you!

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