In this chapter, we have covered some of the major differences between the Java and Scala ecosystems, and it is noticed that apart from SBT and REPL, which are not found in the Java world, we are able to reuse all the Java libraries, tools, and frameworks. We have seen that this group % artifact % version format used to load dependencies in SBT is the same as that of Java's Maven, and in fact, SBT, by default, is similar to most of the Maven repositories (for example, Maven Central). We can, therefore, feel confident that the vast majority of our Java skills are reusable, and they make the transition easier at least as long as the ecosystem is concerned. We voluntarily omitted talking about the testing ecosystem as this is the main topic of our next chapter.