B4J Question Raspberry PI SW Requisites

[GPN]

I'm developing an UI application for Raspberry PI. I'm using B4J with the remote bridge. The application doesn't run cause of missing component on Raspberry PI.

I've installed jdk-1.8.0_60 for ARM. What do I have to install on Raspberry?

The same error occours when I try:
sudo java - jar AsyncInput1
in tempjars.

Thanks,
regards.

 

[Erel]

Oracle has removed JavaFX from Java 8. If you want to create a UI app that runs on Raspberry Pi then you need to use Java 7.

 

[GPN]

Thanks a lot for your reply.
I've followed the steps shown at this link:
http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/RaspberryPiFX/raspberryfx.html

I've thought that it is the same for B4J. Why not?

 

[Erel]

Oracle removed support for JavaFX in the ARM distribution in version 8u33: https://jaxenter.com/jdk-arm-without-javafx-end-javafx-embedded-114212.html

You can use Java 8u6.

Another (better) option it to create a non-ui app. You can create a server app and access it from the browser. JavaFX apps run very slow on Raspberry Pi which makes them barely usable.

 

[GPN]

I've to realize an embedded product that offer a GUI on a touch display.
Could I use a server app for this scope?
How can I do it?
Thanks for your support.

 

[Erel]

You have two options:
1. Downgrade to Java 7 or Java 8u6.
2. Create a server app and access it from the built-in browser.

 

[GPN]

Thanks a lot for your support.
I'll try first the option 1. I've RPi2 it should be more powerful than RPi1.

 

[rwblinn]

Hi,

I had a simliar dilemma.
Beside a B4J Server App solution (a great B4J feature), I have developed kind of hybrid B4J apps (using Inline Java for the UI and B4J for the logic) which run pretty well on a RPi2.
Look here for more info - but note, these apps have a real simple UI. For complex UIs it will take some effort.
I found running JavaFX on RPi as not acceptable (very slow, full screen).

 

[alienhunter]

Hi
Rob said "I found running JavaFX on RPi as not acceptable (very slow, full screen)."

running like a charm /full screen on a tv hdmi , i notice a very small delay but...
that is a trucking app running on pi-2 with b4j in production in our shop
checks every 1 min a sql server for changes and display it
the only thing that i did i gave the pi board more memory allocation