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Everything I encountered for the first time, while studying OCA.

You can run Apache Tomcat within 5 minutes on macOS 10.14 Mojave.

What is the difference between final, finally, and finalize in Java?

TIL you should compare enums with == instead of equals() in Java.

TIL if you pass custom groups to the form(...) method in Play 2.6.x, you also have to pass the group javax.validation.groups.Default explicitly—if you want any of its fields taken into account during the validation process of a form.

TIL that a HashSet in Java is backed by a HashMap instance.

TIL what effectively final variables in Java are.

TIL that in Java 6 equals to 24.

TIL how to run JShell on Mac OS X when both Java 8 and Java 9 are installed.

If you are using Java MessageFormat, you will possibly encounter the issue that single quotes are not rendered.

TIL that Ebean helps you to keep track of the datetime an entity was last modified.