B4J Question Run on raspberry

[fishwolf]

i have follow this tutorial
https://www.b4x.com/android/forum/threads/b4j-and-raspberry-pi-boards.37019/page-2

i have install jdk and javafx
i run application from shell, i see the log on shell, but don't see the graphic UI of application

any suggest?

Thanks

 

[fixit30]

The first line of that thread states:

Edit: UI apps are no longer supported on Raspberry Pi. Non-ui apps work great and you can show an interface through the browser by implementing a web server.

 

[Mark Read]

https://www.b4x.com/android/forum/threads/javafx-installation-on-raspberry-pi-help-needed.63403/

details how to inst all javafx wwhich is needed for ui apps. The current raspbian has the newer java installed where ui apps will not work. Follow the steps and they will work.

 

[Mark Read]

@fishwolf, did you run in debug mode? Is your app really a ui app as selected from b4j menu?

 

[fishwolf]

i have done this procedure

Step 1: Download http://download.oracle.com/otn-pub/java/jdk/8u73-b02/jdk-8u76-linux-arm32-vfp-hflt.gz
Step 2: sudo tar zxvf jdk-8u76-linux-arm32-vfp-hflt.gz -C /opt ->installs in /opt
Step3: sudo update-alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_76/bin/javac 1
Step4 :sudo update-alternatives --install /usr/bin/java java /opt/jdk1.8.0_76/bin/java 1
Step5: sudo update-alternatives --config javac
Step6: sudo update-alternatives --config java
Step7: download http://108.61.191.178/downloads/openjfx-8u40-sdk-overlay-linux-armv6hf.zip
Step8: sudo unzip openjfx-8u40-sdk-overlay-linux-armv6hf.zip -d /opt/jdk1.8.0_76

The sample application is in release mode, but the problem is already present.

 

[Mark Read]

Which version of Raspbian are you using, Wheezy or Jessie (new)?
Which version of Java are you using in B4J?

 

[rwblinn]

Could you share a sample project to be able to test.

I have been testing OpenJFX with jdk1.8.0_73. See attached project. Running fine so far in full screen mode on the Raspberry Pi (latest Jessie Version).

 

[fishwolf]

Which version of Raspbian are you using, Wheezy or Jessie (new)?
Which version of Java are you using in B4J?

Jessie the last
jdk1.8.0_72

 

[fishwolf]

Could you share a sample project to be able to test.

I have been testing OpenJFX with jdk1.8.0_73. See attached project. Running fine so far in full screen mode on the Raspberry Pi (latest Jessie Version).

also this project doesn't work on my raspberry.
i run this command
java -jar app.jar
start but don't show UI

 

[rwblinn]

Hi,

tested your application on a Raspberry Pi 2 (OpenJFX jdk1.8.0_73, latest Jessie Version).
Running fine via
a) the b4j-bridge (running on the Raspberry Pi) and
b) from the desktop in a terminal session by invoking $sudo java -jar ShowView.jar. Note that you need to run as sudo else error that mouse class can not be found.

Note: Added a Close Button to be able to close the MainForm.

What error messages do you get?

BTW: This is the procedure I used to install Java and OpenJDK = again just to go for sure if this matches your installation steps.

#OpenJFX Installation on the Raspberry Pi
Status 20160212 using jdk-8u73: This can change depending on the Java JDK version.

Step 1
Download Java JDK for Linux ARM32
Open http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
Accept the Licence Agreement
Download jdk-8u73-linux-arm32-vfp-hflt.tar.gz to /home/pi/Downloads

Step 2
Install JDK in folder /opt
cd /home/pi/Downloads
Unpack the tar.gz file to /opt:
sudo tar zxvf jdk-8u73-linux-arm32-vfp-hflt.tar.gz -C /opt

Step3
sudo update-alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_73/bin/javac 1

Step4
sudo update-alternatives --install /usr/bin/java java /opt/jdk1.8.0_73/bin/java 1

Step5
sudo update-alternatives --config javac
In the dialog, select option 1

Step6
sudo update-alternatives --config java
In the dialog, select option 1

Step7
Download the OpenJFX
http://108.61.191.178/downloads/openjfx-8u40-sdk-overlay-linux-armv6hf.zip

Step8
Install the OpenJFX in folder /opt/jdk1.8.0_73
sudo unzip openjfx-8u40-sdk-overlay-linux-armv6hf.zip -d /opt/jdk1.8.0_73

 

[fishwolf]

I have followed all steps on a new raspberry installation

i have the same problem, the application start and run, but i don't see the UI (see screen-shot)
in shell i see the debug output
i'm using xrdp for a remote desktop, i don't think that is the problem, other application work fine

 

[rbghongade]

@fishwolf,
Probably your OS is using a default java installation and not the downloaded one (unless you have set the path to new installation via JAVA environment path)
Running the command: sudo /your new java path/java -jar /your program path/program.jar
may help.

 

[fishwolf]

no, same problem

 

[rwblinn]

[CORRECTION]
Did experience the same, which means when starting the OpenJFX application from a Remote Desktop Terminal Session under xrdp, the application is NOT shown in the Remote Desktop Session BUT the application is shown instead on a Monitor which is directly connected to the Raspberry Pi when starting via Remote Desktop.

Question: Did you try looking up on a Monitor directly connected to the Raspberry Pi?

Started ShowView via Remote Desktop Terminal Session - the GUI is shown on the Monitor directly connected to the Raspberry Pi.

 

[fishwolf]

With the monitor the UI interface is showed, but the color are false and is not possible close the application.

maybe the first version of raspberry (256 Mb) is too sloow?

 

[fishwolf]

I have installed all on new raspberry p2, the result on monitor is equal

 

[fishwolf]

But B4J application with GUI run REALLY on raspberry?

 

[Erel]

See the answer in the second post.

 

[fishwolf]

See the answer in the second post.

Ok, what a pity

for curiosity, it's a problem of B4J (in next version will resolve) or is a insurmountable problem

 

[Erel]

Oracle has removed JavaFX from newer versions of Java for ARM boards. The last supported version was Java 8.06 (8u6).