B4J Question Trying to use I2C on Raspberry Pi 3B, but "java.lang.reflect.InvocationTargetException" error occurred.

P

PierPaduan

Active Member
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Longtime User
Hi all,
I'm trying to use I2C on GPIO of Raspberri PI 3B.
I2C interface has been enabled using raspi-config.
Actually I don't have an I2C device connected to the GPIO pins, but only an oscilloscope connected.
I'm using the code suggested by Erel here: https://www.b4x.com/android/forum/threads/iot-jpi4j-raspberry-pi-gpio-controller.37493/#content
I'm in debug mode. If I use Bus 0 I obtain Error: "java.lang.reflect.InvocationTargetException". To avoid this I changed to Bus 1 as follow and it works:
B4X: 
    Dim bus As JavaObject = GetBus(1)
    Dim device As JavaObject = GetDevice(bus, 0)
    Write(device, 120)
When I get the bus I have the following WARNINGS:
Code: 
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.pi4j.io.file.LinuxFile (file:/home/pi/tempjars/AsyncInput1) to field java.nio.Buffer.address
WARNING: Please consider reporting this to the maintainers of com.pi4j.io.file.LinuxFile
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Anyway I proceed and I get bus and device correctly, but when in the Sub Write(...) the RunMethod runs, I have this error:
Code: 
Error occurred on line: 684
java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at anywheresoftware.b4j.object.JavaObject.RunMethod(JavaObject.java:132)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at anywheresoftware.b4a.shell.Shell.runVoidMethod(Shell.java:676)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:240)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:
167)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:91)
    at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
    at anywheresoftware.b4a.objects.Timer$TickTack$1.run(Timer.java:118)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
    at javafx.graphics/com.sun.glass.ui.monocle.RunnableProcessor.runLoop(RunnableProcessor.java:92)
    at javafx.graphics/com.sun.glass.ui.monocle.RunnableProcessor.enterNestedEventLoop(RunnableProces
sor.java:107)
    at javafx.graphics/com.sun.glass.ui.monocle.MonocleApplication._enterNestedEventLoop(MonocleApplication.java:143)
    at javafx.graphics/com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509)
    at javafx.graphics/com.sun.glass.ui.EventLoop.enter(EventLoop.java:107)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:591)
    at javafx.graphics/javafx.stage.Stage.showAndWait(Stage.java:465)
    at javafx.controls/javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162)
    at javafx.controls/javafx.scene.control.Dialog.showAndWait(Dialog.java:345)
    at anywheresoftware.b4j.objects.JFX.Msgbox2(JFX.java:220)
    at anywheresoftware.b4j.objects.JFX.Msgbox(JFX.java:185)
    at b4j.example.main._appstart(main.java:260)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflec
t.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:632)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:237)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:167)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:91)
    at anywheresoftware.b4a.shell.ShellBA.raiseEvent2(ShellBA.java:98)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:78)
    at b4j.example.main.start(main.java:38)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:846)
    at javafx.
graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:455)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428)
    at java.base/java.security.AccessController.doPrivileged(Native Method)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
    at javafx.graphics/com.sun.glass.ui.monocle.RunnableProcessor.runLoop(RunnableProcessor.java:92)
    at javafx.graphics/com.sun.glass.ui.monocle.RunnableProcessor.run(RunnableProcessor.java:51)
    at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.NoClassDefFoundError: sun/misc/SharedSecrets
    at com.pi4j.io.file.LinuxFile.getFileDescriptor(LinuxFile.java:215)
    at com.pi4j.io.file.LinuxFile.ioctl(LinuxFile.java:103)
    at com.pi4j.io.i2c.impl.I2CBusImpl.selectBusSlave(I2CBusImpl.java:291)
    at com.pi4j.io.i2c.impl.I2CBusImpl.runBusLockedDeviceAction(I2CBusImpl.java:258)
    at com.pi4j.io.i2c.impl.I2CBusImpl.writeByteDirect(I2CBusImpl.j
ava:169)
    at com.pi4j.io.i2c.impl.I2CDeviceImpl.write(I2CDeviceImpl.java:92)
    ... 57 more
Caused by: java.lang.ClassNotFoundException: sun.misc.SharedSecrets
    at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)
    at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
    ... 63 more
I don't know what I'm doing wrong.
Please someone can help me fixing this error?
Thanks to everyone.
 
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Hello.
Downloaded from Oracle site this file: jdk-8u241-linux-arm32-vfp-hflt.tar.gz
Copied and unpacked on Raspberry in /home/pi
Launched the bridge with:
sudo jdk1.8.0_241/bin/java -jar b4j-bridge.jar
Click to expand...
Performed connection with B4J and Run application.
The B4J log windows says
Errore: non sono presenti i componenti runtime di JavaFX necessari per eseguire questa applicazione
Click to expand...
Translated: "Error: there are no JavaFX runtime components needed to run this application".

If I do the same using Jdk11, the Java FX modules are loaded and I obtain the same error as yesterday.

What can I do now?
Thanks to everybody.
 
Upvote 0
So I should create an UI app running on Java 11 and a not UI app for the I2C communication running on Java 8. Is this correct? In this case what's the correct way to exchange data between the apps?
 
Upvote 0
With a not UI app on Java 8 I has been able to transmit and receive data with the I2C.
I will try the data exchange between app soon.
Thank you very much Erel.
 
Upvote 0
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