With Java 9 comes Project Jigsaw – a modularization of the JDK – which will break existing code. An overview over the planned changes lets you see whether yours is affected.
Java has no Elvis operator (or null coalescing operator / null-safe member selection) but with lambda expressions / method references you can roll your own.
An explanation of value-based classes in Java 8. Why do they exist? What are their limitations? How (not) to use them?
Covering literally everything there is to know about Java 8’s default methods.
There are new Javadoc tags used in Java 8: @apiNote, @implSpec and @implNote. Take a look at their history, meaning and use on command line and with Maven.
See how Java’s creation of instances of non-capturing lambda expressions can lead to unexpected and possibly bug-inducing behavior.
Discussing the talk “Lambdas in Java: A peek under the hood” given by Brian Goetz at the goto; conference 2013 in Aarhus.
A summary of why you can’t serialize Optional and what can be done to deal with that limitation if necessary.
A close look at serialization and a presentation of some key concepts of Java’s serialization system.
Discussing the reasons for not making Java 8’s new type Optional serializable.