How to show java plugin console

It's because the Java Console is hidden by default.

To change this:

1. First start the Java Control Panel.

   From the command line run: ControlPanel (if not in PATH, you may have to run something like /usr/lib/jvm/jre1.7.0_51/bin/ControlPanel )

   Or, choose from the Dash like the screenshot below

   

2. In the Java Control Panel go to the Advanced Tab, expand Java Console and choose Show Console. Screenshot below:

   

3. Now the console will pop up whenever you execute ANY Java Applet.

Fix INFO from this bug.

If you don't have the dash interface (for example if you use Kubuntu, Lubuntu, etc), an alternative method is:

1) Open Terminal and type:

update-alternatives --display java

2) Change Directory to the last directory shown, for example:

cd /usr/lib/jvm/java-7-oracle/jre/bin/

3) Type:

./ControlPanel