I\'ve been using Eclipse for some time already, and I didn\'t have any problems with it. However, when I tried to generate some javadoc, I found that I didn\'t have the SDK
If you have got a problem like that, you should change the path of jre.
Firstly, computer> properties > advance system setting > Environment variables > find "path" under system variables then give the directory of your jre/bin. (for example C:\ Program Files\ java\ jre\ bin)