PlantUML Diagram Preview is not working

[david-x64]

Observed vs. expected behavior

I created a simple asciidoc file with an embedded PlantUML diagram.
I expected to see this diagram in the preview window.

Instead the preview shows an error message.

Steps to reproduce

Open an asciidoc file in intellij with this content and watch the preview window:

[plantuml]
----
@startuml
testdot
@enduml
----

[plantuml]
----
skinparam backgroundColor #707070

abstract class Pet
class Dog
class Cat

Pet <|-- Dog
Pet <|-- Cat
----

Environment

OS: Linux Mint 22

• I have downloaded intellij as tar archive, extracted it and ran it from the contained bin directory by executing the native launcher idea.
• I have installed the automatically suggested asciidoc plugin version.
• I have clicked the link "download dependencies for diagrams" in asciidoc plugin settings.

Plugin Version: 0.42.2

IntelliJ Details:

IntelliJ IDEA 2024.2.0.1 (Ultimate Edition)
Build #IU-242.20224.387, built on August 13, 2024
Licensed to xxxxxxxxxxx
Subscription is active until January 4, 2025.
Runtime version: 21.0.3+13-b509.4 amd64 (JCEF 122.1.9)
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o.
Toolkit: sun.awt.X11.XToolkit
Linux 6.8.0-40-generic
GC: G1 Young Generation, G1 Concurrent GC, G1 Old Generation
Memory: 4096M
Cores: 8
Registry:
ide.experimental.ui=true
Non-Bundled Plugins:
org.asciidoctor.intellij.asciidoc (0.42.2)
Kotlin: 242.20224.387-IJ
Current Desktop: X-Cinnamon