App can't be opened because it is from an unidentified developer

Question

I installed Mac OS X Mavericks (10.9) yesterday and since then I am not able to start my Eclipse. I am attaching a screenshot of the message I see.

Is there a workar

Answer 1

Terminal type:

Last login: Thu Dec 20 08:28:43 on console
 ~  sudo spctl --master-disable
Password:
 ~  spctl --status
assessments disabled
 ~ 

System Preferences->Security & Privacy

Answer 2

Try looking into Gatekeeper. I am not sure of too much Mac stuff, but I heard that you can enable it in there.

Answer 3

Open terminal, go to extracted folder of eclipse and run the following command:

./eclipse -clean

Answer 4

I had the same problem, Eclipse would not start. Found this link and it worked like a charm:

Can't click Menu Bar Items in Eclipse

Java is messed-up on Maverick, need to download and install from here: http://support.apple.com/kb/DL1572?viewlocale=en_US&locale=en_US

Answer 5

Open Terminal, Go to the eclipse folder, Run ./eclipse

Answer 6

You can also use the xattr command as in Stack Overflow question How do I remove the "extended attributes" on a file in Mac OS X?.

Just remove the com.apple.quarantine attribute. It works even if you don't have an administrator account, which can be a plus. After that, the app isn't considered "downloaded" and is therefore not blocked.