Java and Mac retina support
Apple's Java 6 JRE will support HiDPI, however it is not currently supported by Oracle's Java 7 JRE. It also doesn't work under the latest dev builds of Java 8. Swing and JavaFX apps are blurry on a Retinia MacBook. This is why IntelliJ still runs under Java 6. Eclipse applications will require the PList mode that Jurriaan Mous mentioned. The milestone builds of Eclipse 4.3 don't require the edit.