Since the last Update to jdk 7u51, in the default settings of java is not allowing to run java un-trusted apps. Only applets having a certificate and proper permissions attribute can be run.
Running app/website without certificate
Make sure you've the latest version. It is jdk-7u51
Open Java Control Panel & Alter your security settings to Medium. It will allow all applications & java enabled services to run except applications that request all permissions.
Note: Make sure you're doing this by acknowledging that the application can be trusted. Unless I would recommend not to alter any changes.
Since the last Update to
jdk 7u51, in the default settings of java is not allowing to run java un-trusted apps. Only applets having a certificate and proper permissions attribute can be run.Running app/website without certificate
Open Java Control Panel & Alter your security settings to Medium. It will allow all applications & java enabled services to run except applications that request all permissions.
Note: Make sure you're doing this by acknowledging that the application can be trusted. Unless I would recommend not to alter any changes.
I also recommend you to have a read on How do I control when an untrusted applet or application runs in my web browser?
Hope this helps!
Source: Ubuntu - saying your security settings have blocked an application from running with an out-of-date version of java