Spring's mailSender with Google App Engine

Ever wanted to use Spring's mailSender in a GAE hosted application? This is how it's done!

<bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
  <!-- Specific Google protocol used with Google App Engine -->
  <property name="protocol" value="gm" />
 </bean>

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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

Using Spring Security's OpenID implementation (openid4java) on Google App Engine

The goal with this exercise is to have a running example of an OpenID login on a simple Spring application, using Google as the OpenID Provider. Note that the application will be running on Google App Engine and that Spring Roo is only used for simplicity of creating the project files. Any Spring-based application could use the same implementation. First of all, create a simple project using Spring Roo (or any equivalent framework), including the default security setup: project --topLevelPackage com.technowobble persistence setup --provider DATANUCLEUS --database GOOGLE_APP_ENGINE entity --class ~.domain.MyEntity field string --fieldName name controller all --package com.technowobble.controller security setup This setup only provides us with a form-login, which is not what we wanted. So what about OpenID? Well, if it wasn't for Google App Engine, I would happily have added an <openid-login>-tag to applicationContext-security.xml, but things are never that easy, are the

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