Could not find or load main class pattypan.Main in Ubuntu 20.04

[bodhisattwawiki]

$ java -jar pattypan.jar
Error: Could not find or load main class pattypan.Main
Caused by: java.lang.NoClassDefFoundError: javafx/application/Application

$ java -version
openjdk version "11.0.10" 2021-01-19
OpenJDK Runtime Environment (build 11.0.10+9-Ubuntu-0ubuntu1.20.04)
OpenJDK 64-Bit Server VM (build 11.0.10+9-Ubuntu-0ubuntu1.20.04, mixed mode)

[atetevoortwis]

Same here, also with OpenJDK 8:

$ java -version
openjdk version "1.8.0_282"
OpenJDK Runtime Environment (build 1.8.0_282-8u282-b08-0ubuntu1~20.04-b08)
OpenJDK 64-Bit Server VM (build 25.282-b08, mixed mode)

$ java -jar pattypan.jar 
Error: Could not find or load main class pattypan.Main

[Abbe98]

Duplicate of #84.

[JoKalliauer]

according to #84 (comment)

sudo update-alternatives --config java and changing to java-1.8.0-openjdk.x86_64 (/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.282.b08-0.fc33.x86_64/jre/bin/java) solved the issue for me. (Fedora 33)

[LibrErli]

same as above (Ubuntu 20.04)

java -jar pattypan.jar
Fehler: Hauptklasse pattypan.Main konnte nicht gefunden oder geladen werden

java -version
openjdk version "1.8.0_292"
OpenJDK Runtime Environment (build 1.8.0_292-8u292-b10-0ubuntu1~20.04-b10)
OpenJDK 64-Bit Server VM (build 25.292-b10, mixed mode)

and for update-alternatives --config java there are only 2 options available (although i have installed openjfx before) - no option allows to start pattypan.

sudo update-alternatives --config java 
Es gibt 2 Auswahlmöglichkeiten für die Alternative java (welche /usr/bin/java bereitstellen).

  Auswahl      Pfad                                            Priorität Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      automatischer Modus
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java      1111      manueller Modus
* 2            /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java   1081      manueller Modus

[JoKalliauer]

@LibrErli Could you try #84 (comment) by @Lod3 :

apt purge openjfx
apt install openjfx=8u161-b12-1ubuntu2 libopenjfx-jni=8u161-b12-1ubuntu2 libopenjfx-java=8u161-b12-1ubuntu2
apt-mark hold openjfx libopenjfx-jni libopenjfx-java
/usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java -jar pattypan.jar

[Abbe98]

Pattypan 22.02 does no longer need a separate OpenJFX installation nor does it depend on Java <11.