Date: 2014dec3 OS: Windows Language: Java Q. How does Eclipse know which Java to use? A. It follows the symlinks in c:\ProgramData\Oracle\Java\javapath That folder has:

java.exe --> c:\Program Files...\java.exe javaw.exe --> c:\Program Files...\javaw.exe javaws.exe --> c:\Program Files...\javaws.exe

We have an article on symlinks on Windows. http://www.davekb.com/search.php?target=symlinks+Windows