After applying Java Updates, KeyMusician Keyboard application won't run

After applying the latest Java updates (to open Java), the Keymusician Keyboard application no longer runs.

When I run the JAR file manually in a terminal, I get the following error information:

aere@aere-VGN-SZ430N:~$ java -jar KMK.jar -DebugLevel=2373
Exception in thread "main" java.awt.AWTError: Assistive Technology not found: org.GNOME.Accessibility.AtkWrapper
 at java.desktop/java.awt.Toolkit.newAWTError(Toolkit.java:472)
 at java.desktop/java.awt.Toolkit.fallbackToLoadClassForAT(Toolkit.java:488)
 at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
 at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177)
 at java.base/java.util.HashMap$KeySpliterator.forEachRemaining(HashMap.java:1608)
 at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
 at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
 at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
 at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
 at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
 at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
 at java.desktop/java.awt.Toolkit.loadAssistiveTechnologies(Toolkit.java:532)
 at java.desktop/java.awt.Toolkit.getDefaultToolkit(Toolkit.java:613)
 at java.desktop/sun.swing.SwingUtilities2.getSystemMnemonicKeyMask(SwingUtilities2.java:2143)
 at java.desktop/javax.swing.plaf.basic.BasicLookAndFeel.initComponentDefaults(BasicLookAndFeel.java:1096)
 at java.desktop/javax.swing.plaf.metal.MetalLookAndFeel.initComponentDefaults(MetalLookAndFeel.java:440)
 at java.desktop/javax.swing.plaf.basic.BasicLookAndFeel.getDefaults(BasicLookAndFeel.java:150)
 at java.desktop/javax.swing.plaf.metal.MetalLookAndFeel.getDefaults(MetalLookAndFeel.java:1560)
 at java.desktop/javax.swing.UIManager.setLookAndFeel(UIManager.java:587)
 at java.desktop/javax.swing.UIManager.setLookAndFeel(UIManager.java:628)
 at pkgamk.AMKClass.main(AMKClass.java:121)
Caused by: java.lang.ClassNotFoundException: org.GNOME.Accessibility.AtkWrapper
 at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
 at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)
 at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)
 at java.base/java.lang.Class.forName0(Native Method)
 at java.base/java.lang.Class.forName(Class.java:374)
 at java.desktop/java.awt.Toolkit.fallbackToLoadClassForAT(Toolkit.java:485)
 ... 19 more
aere@aere-VGN-SZ430N:~$

However, when I run the same JAR-file using Java Web Start (iced-tea), it runs okay, using the same configuration.

When running it via Java Web Start, it appears the earlier problem I reported, regarding the lack of slider-handles using the GTK+ look-and-feel, has been fixed.

I am using Lubuntu 18.04.1 LTS.

On that system, default-jre depends on openjdk-11-jre, version 10.0.2+13-1ubuntu0.18.04.1

When I accessed the installed application (installed by gdebi), I expected to run as it had been doing before.

Instead, it crashed early in the initialization process.

I tried running it manually in a terminal session, and got the error reported above.

I tried running it via JNLP (Java Web Start, using icedtea), and it ran okay.

Since it is now distributed as a Debian package, I need the installed version to continue to work.

I can attach (if you request), the Debian package for installing it, the JAR-file, and/or the JNLP file for launching it via Java Web Start.

Please let me know what you need.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: default-jre 2:1.10-63ubuntu1~02
ProcVersionSignature: Ubuntu 4.15.0-33.36-generic 4.15.18
Uname: Linux 4.15.0-33-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CurrentDesktop: LXDE
Date: Fri Aug 31 15:40:58 2018
InstallationDate: Installed on 2018-06-28 (64 days ago)
InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: java-common
UpgradeStatus: No upgrade log present (probably fresh install)