Technowobble

I decided to give SmartGWT a run, and specifically the RestDataSource functionality using Jersey. To make things easier, I'm using Spring Roo to set up my project and scaffold much of the boilerplate code, configurations etc. My approach is to have my domain objects exposed as RESTful web services and create a matching SmartGWT DataSource in order to show them in a GUI. Let's get started, shall we? First of all, you'll need Spring Roo (unless you just download the project source code and want to run it directly). I'm using the following Roo script to start things off: project --topLevelPackage com.technowobble persistence setup --provider HIBERNATE --database HYPERSONIC_IN_MEMORY entity --class ~.domain.Message field string --fieldName value controller class --class ~.ws.MessageResource --preferredMapping rest dependency add --groupId com.sun.jersey --artifactId jersey-server --version 1.3 dependency add --groupId com.sun.jersey.contribs --artifactId jersey-s...

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...

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...

So I started looking into Roo the other day. Seems like a nice tool (once it matures a little more). Anyway - I wanted to create a custom module in addition to the two being generated when adding GWT-support to the project. Not as easy as I thought, mainly because I hadn't seen the Url Rewrite Filter before. I ended up with a 404, no matter what I did, and couldn't figure out why. Frustration! After reading up on the url rewrite stuff, I was ready to give it another try. Let's create a module called Application, based on the standard sample application you'll get using the GWT wizard in Eclipse. First of all, create the Roo project using the following instructions: project --topLevelPackage com.technowobble persistence setup --provider HIBERNATE --database HYPERSONIC_IN_MEMORY entity --class com.technowobble.domain.MyEntity gwt setup (The "gwt setup" setup command generates some code that will not compile unless there's a persistence setup and at lea...

First of all - you need to have a Facebook account. Then you need to create an application on Facebook at http://www.facebook.com/developers/createapp.php , that will give you an App Id. This id is tightly connected to the url/site from which you will be using the JavaScript SDK and you'll be using it later. For development, localhost addresses works fine - i.e. http://127.0.0.1:8888. Next thing is to add the actual JavaScript library to you hostpage, which according to Facebook means adding this piece of JavaScript just before the body-endtag: <!-- Facebook integration --> <div id="fb-root"></div> <script> (function() { var e = document.createElement('script'); e.async = true; e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js'; document.getElementById('fb-root').appendChild(e); }()); </script> It will dynamically add a script-tag into your html-file, which bypasses the "Same Origin ...

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...

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>

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!