Android sdk upgrade to 1.5

When upgrading your Android Eclipse projects to SDK 1.5 you may find that the compiler complains about you having some JDK active from which it can't read classes. This probably means that you have an android.jar file on your class path that shouldn't be there. Go to the library options, if there's an android.jar - apart from the Android 1.5 or 1.1 entry - delete that android.jar. Then you should be fine.