A look at RoboVM: iOS apps in Java

RoboVM is one of the projects I’ve been keeping a close eye on for a while now. Its aim is to allow native iOS apps to be developed in Java. With its recent 1.0 beta 2 release I thought it was time to take it for another spin.

If you ever tried maintaining an app with two separate codebases for Android and iOS at some point you probably wished for a way to share code between the two, reducing duplication and saving development time. I certainly did. And so did Google for their Inbox app apparently – they ended up writing their J2ObjC Java to Objective C transpiler.

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Testing Amazon SQS locally with ElasticMQ

If you’re developing an application that uses the Amazon Simple Queue Service (SQS), you may find yourself asking how you can run and test your application locally without having to connect to the real SQS every time. At least, I did – when running our test suite was getting painfully slow.

Luckily, there is at least one option: ElasticMQ provides an SQS-compatible interface.

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Creating a Neo4j graph of Wikipedia links

I started looking at Neo4j and thought: I need to write a simple but non-trivial application to really try it out. Something with lots of nodes and relationships. I need to find a large dataset that I can import into a graph database.

To my delight, I found that Wikipedia provides database dumps for download. That serves my purpose beautifully: I can represent each wiki page as a node, and the links between pages as relationships. Continue reading

Saner Maven Dependencies

Maven’s popularity is partly due to its dependency management feature. It’s easy to add a new JAR to your project and let Maven take care of importing any other JARs required as transitive dependencies.

But this is a double-edged sword. I’ve seen plenty of projects ending up with multiple versions of the same JARs – or multiple versions of the same classes in different JARs – in their classpath. In such cases the Java class loader simply picks classes from the first JAR it finds, with unpredictable results. Most of the time it’s harmless, but occasionally it causes e.g. a NoSuchMethodException at runtime in one environment, despite everything working fine in another environment. Continue reading