MegaDrumManagerFX, Ubuntu Studio and Java

[Gluv1]

Hi all,

I'm using Ubuntu Studio-20.04.

I have downloaded MegaDrumManagerFX version is now 20200331 and allowed it to run as a program in Permissions.
I have installed Java version: OpenJDK Runtime Environment (build 11.0.9.1+1-Ubuntu-0ubuntu1.20.04)
I right-click on the MegaDrumManagerFX.jar icon and select Open With "OpenJDK Java 11 Runtime"
Nothing happens.

I tried an earlier version of Java, namely "OpenJDK Java 8 Runtime". Still nothing.

Does anyone have any ideas what is wrong? Is an even earlier version of Java needed?

[dmitri]

What happens when you run it from a command line with?:
java -jar MegaDrumManagerFX.jar

[Gluv1]

Hi Dmitri,

I get: Error: Unable to access jarfile MegaDrumManagerFX.jar

If I put in the full path I get:

Error: Could not find or load main class info.megadrum.managerfx.Main
Caused by: java.lang.NoClassDefFoundError: javafx/application/Application

[dmitri]

You need either to install JavaFX for OpenJDK 11 or install OpenJDK 10 alongside 11.

[Gluv1]

JavaFX when installed with OpenJDK 11 seems to do nothing and I can't find OpenJDK 10 anywhere.

[dmitri]

Did you copy JavaFX bin and lib to JAVA_HOME as per https://developer.tizen.org/development ... tion-guide ?

[dmitri]

Or run it like this:
java --module-path /usr/share/openjfx/lib --add-modules javafx.controls,javafx.web -jar MegaDrumManagerFX.jar

[Gluv1]

Did you copy JavaFX bin and lib to JAVA_HOME as per https://developer.tizen.org/development ... tion-guide ?

I copied all the files in lib to JAVA_HOME. There is no bin file. I am using open JDK 11 not openJDK version12 as described on https://developer.tizen.org Would that make a difference?

I also signed up to try Oracle Java 11 but that doesn't work.

[Gluv1]

Or run it like this:
java --module-path /usr/share/openjfx/lib --add-modules javafx.controls,javafx.web -jar MegaDrumManagerFX.jar

This gives Error: Unable to access jarfile MegaDrumManagerFX.jar

Must the Mega Drum module be connected for the manager to open?

[ignotus]

Try Oracle's version of Java, I think I solved the same issue by doing that: https://www.java.com/en/download/. I can't be sure as it was a long time ago and now I can open MDMFX fine with OpenJDK in Mint.