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Currently, the best practice for developing applets in NetBeans is using a J2SE project where all the applet classes reside, and the jar file produced by this project is then packaged in a web application that uses this applet on a web page. However, this requires many manual steps, and the entire setup is non-obvious. Part of this workflow should be addressed by providing direct support for creating applet projects - see issue 139872. The other part of the workflow is the support for easily incorporating applets in web applications, and this should include all kinds of web applications (Java, PHP, Rails, Grails, ...). That is what this issue is asking for.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss