ASM is a Java bytecode manipulation library. Mocking frameworks and runtime code generators use it to dynamically generate Java classes. Here is an introduction to how it works.
JavaFX is an awesome UI framework, but there can definitely be deployment issues. The Javapackager tool improves ease of native installer creation. Here's a quick overview of JavaFX applications with auto updates.
Java compilers make Java source code into bytecode. Did you know all Java classes start with the word CAFEBABE? Check out this awesome look at the Java magic word.
You've probably used exceptions in Java, but have you used them properly? Generally, exceptions are for exceptional cases. See whether or not you should use checked exceptions, and when and how to use Java exceptions.
Java 8's debut included a neat concurrency too, the CompletableFuture class. Here's an awesome look at CompletableFutures, with a glance at combining and composing tasks.
In programming, traits have been around in Scala and PHP a while, but are relatively new through default methods in Java. Here's a quick example on how to use traits in Java 8!
One thing almost universal to programmers? We're lazy. Rather we're resourceful, and don't want to do the same thing twice. Here's how to implement the Lazy class.
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