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I upgraded Ubuntu 12.10 to 13.04 upgraded java to 1.8.0-ea-b118 and still cannot run my application to connect to my office. I have checked all the options and spent all day looking for hits on this issue but cannot fins a solution. Thanks. Sorry meant to add that this is a url running in Chrome that starts a java program. thanks.

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3 Answers 3

Reset to default
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The following can be found on this page

Try to find the installation path of java control panel. From the terminal

$locate jcontrol
/usr/bin/jcontrol
/usr/java/jre1.7.0_25/bin/jcontrol
/usr/java/jre1.7.0_25/lib/desktop/icons/HighContrast/16x16/apps/sun-jcontrol.png
....
/usr/java/jre1.7.0_51/bin/jcontrol
....

In this case /usr/java/jre1.7.0_51/bin/jcontrol is the one you want. So launch it from terminal /usr/java/jre1.7.0_51/bin/jcontrol Then you will be able to change the security setting.

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  • This worked for me. Although the site I was trying to run applet from was on http instead of https. So it didn't work even after changing security setting to Medium. I had to add the site to exceptions list.
    – Zeeshan
    Feb 26, 2014 at 16:59
  • Thank you. I solved my issue following this but in my case path was /usr/lib/jvm/java-8-oracle/bin/jcontrol
    – Bibi424
    May 4, 2014 at 13:53
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Java no longer allows unsigned or self-signed applets to run by default.

You need to edit the file at ~/.java/deployment/deployment.properties and add a line (or edit, if it exists) to set deployment.security.level=MEDIUM.

Additionally, see the advice here for enabling Java in the web browser on Ubuntu http://java.com/en/download/help/enable_browser_ubuntu.xml

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  • Clean and easy!
    – Junaid
    Apr 1, 2015 at 11:47
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Have you checked and re-checked your java settings within Chrome?
What java are you using in Ubuntu?

  • openjdk
  • icedtea
  • gcj

Have you tried the following in a terminal?

  1. open up a terminal by pressing 'Ctrl'+'Alt'+'t',
  2. enter this command after the prompt:
    sudo dpkg-reconfigure --force [PackageName]
  3. Enter, when prompted your sudo password,
  4. Be sure to replace [PackageName] with your installed java product.

Besides java/security settings within Chrome, have you also got some active plugins/extensions installed, which might influence the working of java/java-applets?

The above steps can also be used to reconfigure your Chromium browser.
Before you try this, make sure you have made an export (backup) of your favourites.

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