Windows Open Eclipse Window -> Preferences -> Java -> Installed JREs Add Navigate to JRE location - C:\Program Files\Java\... Mac Open Eclipse Eclipse -> Preferences -> Java -> Installed JREs Add Navigate to JRE location - /Library/Java/JavaVirtualMachines/jdk1.7.0_40.jdk/Contents/Home Set Java Compliance Level Preferences -> Java -> Compiler Compiler Compliance Level