"application blocked by security settings" prevent applets running using oracle SE 7 update 51 on firefox on Linux mint

java firefox plugins applet
Nasser picture Nasser · Jan 22, 2014 · Viewed 103.2k times · Source

Background

Complete fresh installation of Oracle Java SDK (32-bit) on Linux. The installation is correct, the plugin is correctly installed.

Problem

The following error ("Application Blocked by Security Settings") appears when the applet runs inside Firefox:

Mathematica graphics

Setup

Here are the steps I used:

  1. Installed Linux mint 16 on VBox: > uname -a Linux me-VirtualBox 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:12:00 UTC 2013 i686 i686 i686 GNU/Linux
  2. Cleaned all Java instances.
  3. Followed instructions to install jdk-7u51-linux-i586.tar.gz on Linux.
  4. Verified installation > java -version java version "1.7.0_51" Java(TM) SE Runtime Environment (build 1.7.0_51-b13) Java HotSpot(TM) Client VM (build 24.51-b03, mixed mode)
  5. Verified plugin: > pwd /home/me/.mozilla/plugins > ls -l total 0 lrwxrwxrwx 1 me me 46 Jan 22 02:42 libnpjp2.so -> /usr/lib/jvm/jdk1.7.0/jre/lib/i386/libnpjp2.so
  6. Verified Java plugin: Mathematica graphics
  7. Verified Firefox activation: Mathematica graphics Mathematica graphics
  8. Started the Java ControlPanel; set security to Medium: Mathematica graphics Mathematica graphics
  9. Clicked Apply.
  10. Restarted Firefox.

Question

How do you change the security settings to allow the applet to run?

Answer

Juan Carlos Alpizar Chinchilla picture Juan Carlos Alpizar Chinchilla · Feb 2, 2014

As an alternative answer, there's a command line to invoke directly the Control Panel, which is javaws -viewer, should work for both openJDK and Oracle's JDK (thanks @Nasser for checking the availability in Oracle's JDK)

Same caution to run as the user you need to access permissions with applies.

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