The fatal exception problem is solved. To solve it:
I changed the Java installation to latest: (OpenJDK13U-jdk_x64_windows_hotspot_13.0.1_9.msi) from:
Then I downloaded the latest (version 2.8) JSSC code from:
https://search.maven.org/search?q=jssc
and in the Eclipse project I used it to substitute the JSSC that came with the Processing core.
The exception errors disappeared. But now I have the next problem. There are no serial ports returned by the Serial.list() function, even though I have an Arduino device plugged into an USB port. I would appreciate recommendations on how to troubleshoot this.
Is it possible Serial.list() is not finding USB ports because I am using the OpenJDK?