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Category Archives: architecture

UNIX timezone database shut down

The UNIX time zone database has been shut down because of copyright complaints! Overthrow the DCMA!

REST-based architectural style, a big winner

Recently been deeply stuck in building software (apart from starting my PhD part-time). A long time ago I wrote about dynamically loading Spring contexts and component discovery – this system I’ve been building is an evolution of that one. We decided to adopt an most REST-based style to integrate between our components. Now, “run-time” discovery […]

Broken Weblogic JMS “clustering”

I’ve ranted before that Weblogic 11g clustering/distribution technology of its messaging is fundamentally broken. Despite what Oracle claims, JMS in Weblogic is not clustered. Load balanced is a better description. It’s architectural – if any other technology (e.g. SOA Suite, EDN, etc) uses Weblogic JMS as its underlying messaging implementation, it will be broken too. […]

Come back Gavin King, all is forgiven (Spring is the new EJB 2.1)

I’ve just spent the past two days trying to make Spring transaction management work with JPA-annotated Hibernate-backed persistence classes that need to have multiple persistence units with transaction propagation REQUIRES_NEW between the two. For a start, the documentation is merely a series of outlines of brief hints. One measly section.The laughably short Spring 3 doco […]

REST and SOA and Agile and Waterfall

Recently I’ve been working on two projects. They are an exercise in contrasts. First the technologies and the development methodologies. So the first company uses a very Waterfall process and the integration platform is SOA. We’ve managed to build, in the middle of this, a small and focussed Java component that uses JMS in and […]

Stuff that is just plain wrong, part 1,893,567

Weblogic’s a big, vendor-supported, application server right? And it has advanced clustering features, right? So you’d think it’s clustered JMS implementation is one of the best in the business — after all large enterprise systems often require high capacity and reliable clustered messaging, right? And Weblogic is offered as a solution to those sorts of […]

The Ordeal of Installing Oracle Service Bus on a Windows-based developer workstation

This is a genuine installation procedure which I wrote, but you might want to read it for its other values. Overview OSB installation in a development environment consists of a completely separate Weblogic instance and yet another ‘special installation’ of Eclipse. You can’t use existing Eclipse installations. Nor is it recommend to use one of […]

Throw it away and write another one

Most developers familiar with agile methods are familiar with the idea of the spike. A spike is a time-boxed task that concentrates on clarifying the unknowns in your project. Usually these are technological (“can this be done with this technology?”) but they are also sometimes in the area of the business domain (“is this a […]

Dynamically loading Spring contexts from the classpath at runtime

Using these three Spring features will enable us to be able to place a JAR file containing an interface implementation, and a Spring context XML file matching a particular pattern, into the classpath of our WAR, and on restart, we can dynamically pick up the newly inserted features into our application installation.

New software, old process, big mistake

Its very common for software developers to be asked to build some software that is a straight port of an old software package, or to faithfully model (i.e. completely identical to) an existing process that the customer has. This is a huge mistake – try to avoid these projects. I hold that if the customer […]