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I use netbeans 11 with openjdk 11 in Ubuntu 18.04 LTS. I want to run applet program, even though it is deprecated, it is part of my college assignment ☹️
I know that to run applet, you need jdk7/8/older, but previously in Eclipse & IntelliJ I was able to run applet with jdk10, Windows 8.1, so I hope in this case there should be no issues at all. 🤔🤔
I followed instructions given here : Running a java applet from netbeans? I went to project properties > Application > Webstart. But in my system, when I check "enable web start" option and click on OK, still the error "mainclass not found" remains. I figured out that by going again to project-properties > Application > Webstart, the "enable web start option" wasn't tick marked.

I actually found that everytime I check that web-start option, somehow it is never saved and effectively the option "enable web start" is never get checked. Why is that ? Can anyone suggest reasons ?

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    "even though it is deprecated, it is part of my college assignment" Since it is due to the teacher specifying it, please refer them to Why CS teachers should stop teaching Java applets. Ask them if it's OK to do the assignment in a panel (a Swing based JPanel) which can be displayed in a JFrame or JOptionPane (ugly, but easier than an applet or frame). They should be fine with that, and if not, you really need to find a better teacher. Note that I'm the top-ranked provider of answers.. Commented May 9, 2020 at 5:01
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    .. for the applet tag, and even I won't help with them any more. Commented May 9, 2020 at 5:03
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