Java applet for OS X 10.9 (Mavericks) I was trying to run a Java applet (downloaded) through the jnlp file which came with it. And I see this error always.



I looked into the code signing certificate, and its signed from a trusted CA, and the expiry is not until 2020.

So, I narrowed down the issue to the problem mentioned in the following link: Fix the “App can’t be opened because it is from an unidentified developer” Error in Mac OS X which says that OS X has prevented any app from an external developer to not run. This change was made to Gatekeeper.

But, I was not able to find an official release doc which talks about this change.

Another place I heard that Apple has stopped the usage of Java applet all together. Did not find any official doc about that also.

Can anyone point me to a link to an official doc about these updates?
To open the app right-click it and click 'open'. This will open the app with Apple's Gatekeeper (System Preferences > Security &amp; Privacy > General) still activated.

You can see more about this on Apple.com (WWDC video) and on Apple's Developer pages.

Other URLs:


About Gatekeeper



  Mac App Store and identified developers (default in OS X Mountain
  Lion) – Only allow apps that came from the Mac App Store and
  developers using Gatekeeper can open.



macOS Security



  Gatekeeper gives you two security options. The default option allows
  you to download apps from the Mac App Store, as well as those from
  other sources that are signed with an Apple ID.



macOS Human Interface Guidelines: Gatekeeper



  Users can set Gatekeeper to download and install:
  
  (...)
  
  Apps from the Mac App Store and apps signed with a Developer ID (this
  is the default setting) With the default setting, if an app is
  unsigned, Gatekeeper blocks the app from installing and warns users
  that the app did not come from an identified developer. Users can
  choose to override Gatekeeper or change the settings.