My environment is Windows 10, JRuby, and Java 1.8.
Running the JRuby program
java_import javax.swing.JFrame;
JFrame.new("abc")
(which is actually part of the jirb_swing script that comes with JRuby) now results in an error
java.awt.AWTError: Assistive Technology not found: com.evidian.wg.jpi.WGJPI
I am not aware that I have changed something in my Java/JRuby configuration, although our centrally managed Windows 10 might have been updated overnight. In any case, the code has worked so far without error.
I have found this link to a similar problem, but it refers to WSL, and I don't use WSL.
SOLVED the case by installing a fresh copy of Java (for the safe side, I installed all of the SDK, and not just the Java runtime) in addition to the existing one (i.e. I did not make an uninstall), and I made sure that the JDK's bin directory is first in the PATH. I also set the JAVA_HOME environment variable to this directory (it was unset before). After doing this, the error seems to be gone.