Java security warning pop-up requires user interaction in order to run applets. Java provides another way of launching applets in a browser besides using the applet, object or embed tags. Java Web Start allows you to launch an applet with a JNLP file and parameters can be set to applet by using the tag. Oracle released update 21 on Tuesday 16th April, exactly while I was at the Infiltrate MasterClass teaching how to audit and exploit Java.”]
Source: https://immunityproducts.blogspot.com/2013/04/yet-another-java-security-warning-bypass.html