Noteworthy Java entries of mine:

• Print all ASCII alphanumeric characters without using them and done with ASCII as well!
• Infinite compilation Or how generics can be really messy.
• “Hello, World!” Yes, you'll learn something!
• It was just a bug The best use of Java's printf so far.
• I made Java (mostly) unusable
• Determine Java's versions, portable in all versions of Java until 9 included!
• Compute number of chess moves This showcases some of the best golf, math and bit-twiddling tips ever.
• Fastest FizzBuzz implementation for a VM/dynamic language in Java, beats most compiled versions as well.