Java Error: "Your Security Settings Have Blocked a Local Application from Running"

“Your security settings have blocked a local application from running” Java 8

Medium was removed in Java 8u20:

Medium (removed from Java 8 Update 20 and later versions)
Only unsigned applications that request all permissions are blocked. All other applications are allowed to run with security prompts. Selecting the Medium security level is not recommended and will make your computer more vulnerable should you run a malicious application.

Keep in mind, this only applies to unsigned applets that request all permissions.

What to do

To run these applets, you now must add the site to the exception list under the Security tab when you access your Java settings from the Control Panel.

If the applet is not on a website, you must use the applet viewer, which allows you to run applets outside of a browser

*What* Java security settings have blocked a local application from running?

I just tried your code using Java version 1.7.0_25-b17. It works just fine in the browser on the two lower settings seen here.

To get it to work for the highest security level, it needs to be put in a Jar and signed using a valid certificate.

Security settings have blocked a self-signed application from running as developer

You need to buy a real certificate and sign it with that. Otherwise it would require users to trust your certificate, which is not secure at all (you're not a trustworthy entity).

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