&gt; Play has both APIs in Java and Scala, so you can slowly transition from one to the other (provided that you architect your application correctly especially in terms of database access).<p>What does he mean by &quot;architecting the application correctly&quot;? I have a project in production which uses Play framework in Java and I&#x27;d be interesting in transitioning this to Scala? What should I look out for?<p>This is the only discussion I could find for such a migration: <a href="http:&#x2F;&#x2F;grokbase.com&#x2F;t&#x2F;gg&#x2F;play-framework&#x2F;151wb9eebq&#x2F;migrate-step-by-step-from-java-ebean-to-scala" rel="nofollow">http:&#x2F;&#x2F;grokbase.com&#x2F;t&#x2F;gg&#x2F;play-framework&#x2F;151wb9eebq&#x2F;migrate-s...</a>