[fedora-java] FC32: hitting error: java.lang.NoSuchMethodError (same app used to work on FC31)

Hi!

(Java proselyte calling, please be gentle...)

I'm trying to run an application: REW (roomeqwizard,
https://www.roomeqwizard.com), which used to run fine on fc31, but
crashes upon launch w. a freshly installed and updated fc32.

Here's the error message i'm getting:

$ ./roomeqwizard 
sep 11, 2020 6:16:28 PM roomeqwizard.RoomEQ_Wizard A
SEVERE: Error during startup java.lang.NoSuchMethodError:
org.jdesktop.swingx.util.OS.platformName(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
java.lang.NoSuchMethodError:
org.jdesktop.swingx.util.OS.platformName(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;
	at roomeqwizard.RoomEQ_Wizard.O(y:2542)
	at roomeqwizard.RoomEQ_Wizard.main(y:1073)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:84)
	at com.install4j.runtime.launcher.UnixLauncher.start(UnixLauncher.java:66)
	at install4j.roomeqwizard.RoomEQ_Wizard.main(Unknown Source)

According to the programmer, the platformName method is part of the code
included in REW, and REW requires only a Java 8 runtime.  Together with
the author of the application I've tried to do some debugging, where
things seem to point towards my local java installation:

 
https://www.avnirvana.com/threads/linux-installation-problems-java-lang-n...

Info about my java:

  $ java -version
  openjdk version "1.8.0_265"
  OpenJDK Runtime Environment (build 1.8.0_265-b01)
  OpenJDK 64-Bit Server VM (build 25.265-b01, mixed mode)

The openjdk and openjdk-devel packages, plus some, are installed:

  $ dnf list installed '*openjdk*'
  java-1.8.0-openjdk.x86_64             1:1.8.0.265.b01-1.fc32    @updates
  java-1.8.0-openjdk-devel.x86_64       1:1.8.0.265.b01-1.fc32    @updates
  java-1.8.0-openjdk-headless.x86_64    1:1.8.0.265.b01-1.fc32    @updates
  java-1.8.0-openjdk-openjfx.x86_64     1:1.8.0.265.b01-1.fc32    @updates

Q: do the packages above provide me with a proper JRE?

Any clues to what the error might be pointing at?

Any suggestions as to how to get closer to debugging what's going on?

Thanks in advance!

Yours,

-anders