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Disabling URL rewriting for the Googlebot

Http is a stateless protocol. To work around the problems caused by this, web applications have the concept of a session. When a user requests a webpage for the first time the user is assigned a unique 32 character string. This string can be send along in subsequent requests to indicate that these requests are […]

Test driven development for GWT UI code

Test driven development for GWT UI code

Is a test driven development (TDD) approach possible when creating a GUI using GWT? This post is about how to apply MVC (Model-View-Controller) to organize GWT UI code, with these objectives: a clear separation of the controller logic from presentation and model full testability of the controller logic independent of the (browser or hosted mode) […]

Too many open files

Today I was asked to review a piece of code that a coworker of mine suspected was causing “Too many open files“ exceptions in a production environment The code looked innocuous enough. He was using ProcessBuilder to create and run an external application. Regardless I booted into Linux and ran some tests. Now on Linux […]

Spring 2.5 and Maven problems

It looks like the spring 2.5 jars that where uploaded to the official maven repository are broken. The full spring jar is 321 kb large and only contains the spring aop classes. Anyway I added springs own repository to my pom and then i got the correct jar and sources <repository>   <id>spring</id>   <name>Spring Portfolio Repository</name> […]

Extensibility jBPM style

Currently I am involved in a project that is moving away from a proprietary workflow solution to a JBPM based workflow solution. One of the first things I attempted to do was try and make jBPM integrate with the identity management solution used in the project. I knew that jBPM comes packaged with some sort […]

What to do with an Interruptedexception

Many java methods, such as Thread.sleep and Process.waitFor can throw an Interruptedexception. InterruptedException is a checked exception and as such requires you to explicitly catch it. Up until recently I’ve always simply swallowed this exception. I was fairly confident that this was the proper way to deal with this exception because this is how I’d […]