Using Guice to wire application objects together is ubiquitous in the Play framework. In fact, Play is probably the main reason Scala developers are familiar with Guice. Runtime dependency injection frameworks such as Guice are widely used in the Java server world. They can save developers a lot of work by automatically constructing object dependency graphs and managing the lifecycle of objects. This is particularly useful for large enterprise applications and makes a lot of sense for big monolithic apps. Play, being popular among both Java and Scala developers, adopts this approach too. Although Guice is relatively lightweight compared to Java EE CDI or Spring, I would argue that in many Play 2 applications, it is better not to use any DI framework at all.
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I posted an article about my master’s thesis project on the JBoss Tools blog.