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Simple reproducer:

$ cat Foo.java
import java.awt.Dimension;
import javax.swing.JFrame;

public class Foo {
    public static void main(String[] args) {
    JFrame w1 = new JFrame("Window 1"), w2 = new JFrame("Window 2");
    w1.setPreferredSize(new Dimension(600, 600));
    w1.pack();
    w1.setVisible(true);
    w2.setPreferredSize(new Dimension(600, 600));
    w2.pack();
    w2.setVisible(true);
    }
}

$ javac Foo.java
$ java Foo

  Slight move one of the windows and use mouse wheel. The window will
gain focus,
but not be raised.

  It should either get focus and be raised, or not get focus.

  Probably it should just not request focus, to better match what appears
to the 'standard' behaviour of qt/gtk applications.

[ This issue was raided in the internal openjdk-support mailing list,
opening the bug report to associate with the customer portal case report. ]

Filed upstream issue:

https://bugs.openjdk.java.net/browse/JDK-8231991

I send the request for review for this fix:

http://cr.openjdk.java.net/~neugens/JDK-8231991/webrev.00/

Created attachment 1629147 [details]
Proposed fix for jdk8u

Created attachment 1636476 [details]
Proposed fix for jdk8u (correct)

*** Bug 1774765 has been marked as a duplicate of this bug. ***

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:1071