So, seeing that the new Android L is out, I said I should give it a try. I installed the new ADT update from SDK tools and then from the updates. After Eclipse restart, I ge
Tomorrow I had the same problem after the update to ADT 23.
The problem is related to the annotations.
There are two libraries with annotations in the Android SDK:
android-sdk/extras/android/support/annotations/android-support-annotations.jar
this package contains:
and
android-sdk/tools/support/annotations.jar
that...with the new ADT update, for some reason disappeared.
This package contains the two annotations (probably the most used :-)):
Without them, if your code (or dependencies use them) Eclipse will complain.
To fix this problem, we need the previous annotation.jar.
So I downloaded the file from the link suggested by @aarati:
http://central.maven.org/maven2/com/google/android/annotations/4.1.1.4/annotations-4.1.1.4.jar
Renamed it in annotation.jar and moved to: android-sdk/tools/support/
Restarting Eclipse everything will be fine.