Starting with version 42.0.2311.90 m Google Chrome by its default configuration does not support the loading of Java applets.
In order to be able to run any Java applet, you must manually enable the plugin in your Chrome browser by following the steps below:
1. Open Google Chrome and type the following URL: chrome://flags/#enable-npapi (see screenshot below)
2. Click Enable
3. Close all your Google Chrome browser instances and open the browser again
4. In case this problem persists please restart your computer