title: Can't work on my java projects in Eclipse Juno
body: <p>I used to work in Eclipse Luna and had many projects in my workspace. Then I decided to start coding for Android and downloaded the ADT bundle from <a href="https://developer.android.com/sdk/index.html?hl=i#download" rel="nofollow noreferrer">here</a>. I imported my Luna workspace and it worked fine. However, whenever I open a class I get <strong>cannot be resolved</strong> errors everywhere on what used to be flawless code. What difference in packages is causing this? Why can't I write and compile Java in Juno?</p>
  
  <p>Note that I don't see the errors in the package explorer on the left:
  <img src="https://i.stack.imgur.com/7HA8p.png" alt="enter image description here"></p>