MacOS JDK 26 Removed the applet class

We got a report of jaamsim not working on MacOS java 26, looks like newtcanvasAWT still references the old Applet class.

Probably time to retire the applet code in jogl.

Bug report and stack trace here for interest sake.

https://github.com/jaamsim/jaamsim/issues/38

Harvey

More context for the Applet removal in Java 26. Just FYI.

https://inside.java/2025/12/03/applet-removal/

In JDK 27 the class sun.awt.AppContext has been removed, which causes this ClassNotFoundException:

Caught AppContextInfo(Bug 1004) ClassNotFoundException: sun.awt.AppContext on thread J3D-Renderer-1
    [0]: java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:580)
    [1]: java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:502)
    [2]: java.base/java.lang.Class.forName0(Native Method)
    [3]: java.base/java.lang.Class.forName(Class.java:479)
    [4]: java.base/java.lang.Class.forName(Class.java:469)
    [5]: com.jogamp.nativewindow.awt.AppContextInfo$1$1.run(AppContextInfo.java:38)

Any thoughts on removing references to "AppContext" from JOGL?

Thank you in advance,
Mike

I try to remember, it had something to do with Java Webstart, all this should be removed.

I think this is due to unexpected classes to unnamed modules, can you try running with the following arguments and see if it makes a difference?

--add-exports=java.desktop/sun.awt=ALL-UNNAMED

Harvey

Actually, this is an internal information dump only, is anything actually non-functional after this error? While it is dumping the information, does the Java3D rendering still work?

Harvey

Thanks for the help!

Indeed - our application is functional despite the logging.

Here are the start-up flags I'm using:
--add-opens=java.desktop/java.awt=ALL-UNNAMED --add-exports=java.desktop/sun.awt=ALL-UNNAMED --add-exports=java.desktop/sun.java2d=ALL-UNNAMED

It looks like JOGL uses com.jogamp.nativewindow.awt.AppContextInfo to inspect sun.awt.AppContext via reflection to manage native window handles and event queues in applet environments.

The only way to eliminate the message is an updated build that omits the legacy sun.awt.AppContext probe.

Thx. Will remove the AppContextInfo and related calls in coming release.

Thanks Sven!