Another beautiful optimization which was just out with Java 8 update 20 for is the G1 Collector String deduplication. Since strings (and their internal char[] arrays) takes much of our heap, a new optimization has been made that enables the G1 collector to identify strings which are duplicated more than once across your heap and correct them to point into the same internal char[] array,

It’s also transform an architecture in some kind of a rotten architecture which I call distributed monolith or micro-monolith anti-pattern. Symptoms of that anti-patter are following situations:

4 JVM Web Frameworks in 40 Minutes by Joe Kutner

Map capCities =

Map.ofEntries(entry("Manitoba", "Winnipeg"),

entry("Alberta", "Edmonton"));

Do you write enough tests? Even if the answer is yes, there might be some scenarios where you could add a few more to cover extra possibilities. But do you really want to go through the effort of having to write out another test for the extra inputs you are going to test? JUnitParams provides a solution to this, allowing you to write fewer individual tests while keeping the coverage the same.