B4J Question Trying to run a sample program

[NeoTechni]

cpi@clockworkpi:~$ java /home/cpi/java/GraphicsFirstSteps.jar
Error: Could not find or load main class .home.cpi.java.GraphicsFirstSteps.jar

I'm trying to run this on the GameShell which runs Clockwork Pi. I got java installed, but I can't run a jar file. No idea what I'm doing wrong

 

[OliverA]

Are you sure you posted the complete command line? I think there is a -jar command line option missing.

 

[EnriqueGonzalez]

also, are you on a linux enviroment? most of the times, javafx is not installed aside with java.

 

[Cableguy]

Also the "Graphics" part of the command has me thinking... are you trying to run an UI app?
The javafx platform has been discontinued a long time ago

 

[Erel]

The error in the first post happened because of the missing -jar parameter.

 

[NeoTechni]

if you posted some code...

Well I did say it was a sample, and posted the filename, so I'd imagine it's the sample code for B4J with the same filename.

The error in the first post happened because of the missing -jar parameter.

Are you sure you posted the complete command line? I think there is a -jar command line option missing.

That did it.

Also the "Graphics" part of the command has me thinking... are you trying to run an UI app?
The javafx platform has been discontinued a long time ago

also, are you on a linux enviroment? most of the times, javafx is not installed aside with java.

You are correct, it gave me that error now too. All the samples use JFX, can you even make B4J apps without it (that aren't command line apps)?

 

[EnriqueGonzalez]

You are correct, it gave me that error now too. All the samples use JFX, can you even make B4J apps without it (that aren't command line apps)?

You have 2 options, command line or javafx, But you can install javafx:
https://www.bell-sw.com/java.html
https://www.b4x.com/android/forum/threads/raspberry-pi-b4j-ui-applications-with-liberica-jdk.92950/

 

[NeoTechni]

Got it working. I'd bet Erel never expected his code to run on something like this

 

[NeoTechni]

Complete instructions are here: https://forum.clockworkpi.com/t/how-would-you-install-java-8u40/1465
For posterity.