A Java geek

Java Service Loader vs Spring Factories Loader

Inversion of Control is not only possible at the class level, but at the module level. OSGi has been doing it for a long time. However, there are IoC approaches directly available in Java, as well as in Spring. Out-of-the-box, the Java API offers a specific form of Inversion of Control. It’s implemented by the Service Loader class.

Java

Fixing my own Spring Boot starter demo

Since one year or so, I try to show the developer community that there’s no magic involved in Spring Boot but rather just straightforward software engineering. This is achieved with blog posts and conference talks. At jDays, Stéphane Nicoll was nice enough to attend my talk and pointed out an issue in the code. I didn’t fix it then, and it came back to bite me last week during a Pivotal webinar.

Java

Custom collectors in Java 8

Among the many features available in Java 8, streams seem to be one of the biggest game changers regarding the way to write Java code. Usage is quite straightforward: the stream is created from a collection (or from a static method of an utility class), it’s processed using one or many of the available stream methods, and the collected back into a collection or an object. One generally uses one of the static method that the Collectors utility class offers: Collectors.toList()Collectors.

Development

Kotlin for front-end developers

I assume that readers are already familiar with the Kotlin language. Advertised from the site: Statically typed programming language for the JVM, Android and the browser 100% interoperable with Java™ — Headline from the Kotlin website Kotlin first penetrated the Android ecosystem and has seen a huge adoption there. There’s also a growing trend on the JVM, via Spring Boot. Since its latest 1.1 release, Kotlin also offers a production-grade Kotlin to JavaScript transpiler.

JavaEE

Common code in Spring MVC, where to put it?

During my journey coding an actuator for a non-Spring Boot application, I came upon an interesting problem regarding where to actually put a snippet of common code. This post tries to list all available options, and their respective pros and cons in a specific context. As a concrete example, let’s use the REST endpoint returning the map of all JVM properties accessible through the /jvmprops sub-context. Furthermore, I wanted to offer the option to search not only for a single property e.

Technical

Cloud offerings free tier - Amazon vs Google

As a developer, you’re a pretty important resources for service providers. Without developers, service providers cannot make savings based on scale. Having developers also means higher chances of someone having a killer idea on top of your service, creating even more value. And developers attract more developers. In order to achieve that, service providers offer free services. In the Cloud realm, both Google and Amazon have a packaged offer valid for a year.

JavaEE

Fully configurable mappings for Spring MVC

As I wrote some weeks earlier, I’m trying to implement features of the Spring Boot actuator in a non-Boot Spring MVC applications. Developing the endpoints themselves is quite straightforward. Much more challenging, however, is to be able to configure the mapping in a properties file, like in the actuator. This got me to check more closely at how it was done in the current code. This post sums up my 'reverse-engineering' attempt around the subject.

Development

Coping with stringly-typed

UPDATED on March 13, 2017: Add Builder pattern section Most developers have strong opinions regarding whether a language should be strongly-typed or weakly-typed, whatever notions they put behind those terms. Some also actively practice stringly-typed programming - mostly without even being aware of it. It happens when most of attributes and parameters of a codebase are String.

Development

A use-case for Spring component scan

Regular readers of this blog know I’m a big proponent of the Spring framework, but I’m quite opinionated in the way it should be used. For example, I favor explicit object instantiation and explicit component wiring over self-annotated classes, component scanning and autowiring. Concepts Though those concepts are used by many Spring developers, my experience has taught me they are not always fully understood. Some explanation is in order.

Nicolas Fränkel's blog