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

Question

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     Setup  Here are the steps I used    Installed Linux mint 16 on VBox   gt  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 Cleaned all Java instances  Followed instructions to install jdk-7u51-linux-i586 tar gz on Linux  Verified installation  gt  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   Verified plugin   gt  pwd  home me  mozilla plugins  gt  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  Verified Java plugin   Verified Firefox activation    Started the Java ControlPanel  set security to Medium    Clicked Apply  Restarted Firefox    Question  How do you change the security settings to allow the applet to run

User · Answer

You can also use Edit Site List and make it be an exception so that you can run it from the specific website

User · Answer

The application that you are running is blocked because the application does not comply with security guidelines implemented in Java 7 Update 51

User · Answer

pwd  usr lib jvm jre1 8 0 25 bin    jcontrol  as follow   java Control Panel --  Security --   Edit Site list    then  apply  and ok

User · Answer

Just start your browser with superuser rights  and don t forget to set Java s JRE security to medium

User · Answer

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

User · Answer

I had this issue  The security settings in the ControlPanel seem to be user specific  Try running it as the user you are actually running your browser as  you are not browsing as root     and setting the security level to Medium there  - For me  that did it

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

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