Setting the Security Level
Note: These settings affect all browsers that use Oracle's Java browser plug-in. They do not affect stand-alone Java apps.
The Security tab of the Java Control Panel contains a Security Level slider that controls the restrictions placed on any app that is run from the web or from the local system. The user can select medium, high or very high security settings. The settings determine if an app is allowed to run and if so, the warnings you must accept before the app is launched. The warnings contain information about the signing status of the app, the location of the app, and whether the app is requesting enhanced permissions to run outside the security sandbox.
Unsigned apps that request enhanced permissions are not allowed to run, regardless of the Security Level setting. At the Very High setting, only apps signed with a valid certificate are allowed to run. For information on all security levels, see the Security section of the Java Control Panel documentation.
The default security level is High.
The ability to run applications is also affected by the settings of the Security Options for a Secure Execution Environment.
Security Options for a Secure Execution Environment
To select the behavior when attempting to run an app, there are several checkboxes available in the Java Control Panel (under the Advanced tab):
Allow user to grant permissions to signed content
Show sandbox warning banner
Allow user to accept JNLP security requests
Don't prompt for client certificate selection when no certificates or only one exists
Warn if site certificate does not match hostname
Show site certificate even if it is valid
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