Questions tagged [java]

Java is a high level programming language. Roughly four billion devices run Java, as it is used in almost all computers and mobile phones, as well as other interactive devices. In order to program with Java, a separate JDK has to be installed beyond the normal language kit.

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25 views

Slow Serialcommunication between Raspberry Pi and Ardunio Mega

I'm in the process of tinkering with something, and for that I need an Arduino to collect measurement data, and a PI to process it all and send it on. My problem is that the connection between my Pi ...
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68 views

JavaFX application does not accept touch inputs

I am trying to run a javaFX application on a raspberry pi 3b+ with a 7" 1024x600 touchscreen by Lebula. When I plug a mouse in, the application works as normal, but, when I try to use the touchscreen, ...
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60 views

Controlling Raspberry PI zero device over the internet

I have five Raspberry Pi zero W devices and each device connected to 4 channel relay module. These five devices are in different locations and connected to the internet. We wrote a python program to ...
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47 views

Running a java program on Raspberry Pi

I want to use my pi as a navigation and weather station on my boat. One of the programs I need is JWX.jar. When I try to execute it, I type "java -jar JWX.jar", wich works flawlesly in Linux Mint and ...
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RangeError: index out of range error

I run Noble on the Raspberry Pi 3 (with Bluetooth) and i receive RSSI values from the nearby beacons that i have. However, if noble is ran the whole times i occasionally get the following error. ...
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Most compatible Java on Raspbian

I have run my .jar code on Raspberry Pi 3B - Raspbian Buster with Oracle Java 8 (1.8.0_241). The code will completely run after ~80 seconds. It's read that some java versions/models (like openJdk, ...
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1answer
51 views

Processing cannot load GStreamer

I'm trying to play a video on Processing 3.5.3 with the GLvideo library, but I am getting an error message that Processing cannot load GStreamer. import gohai.glvideo.*; GLMovie video; boolean ...
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2answers
269 views

LibreOffice Base in Raspbian Buster image will not find openJDK v 11's JRE

2-8-2020: While attempting to explore Libreoffice Base on the pi4B 4GB running: pi@raspberrypi:~ $ uname -a Linux raspberrypi 4.19.97-v7l+ #1294 SMP Thu Jan 30 13:21:14 GMT 2020 armv7l GNU/Linux I ...
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26 views

Send data from PC to RPi although theyre not in the same LAN

i'm planning a school project that should represent a two-factor authentication. I already made a user interface to type in information to log in like email address and password. My plan was to ...
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2answers
72 views

How to run Minecraft 1.12.2 on the latest release of raspbian

I have tried the regular method to installing minecraft 1.12.2, that didn't find ./runOptifine1_12_2.sh: 52: ./runOptifine1_12_2.sh: /usr/lib/jvm/jdk-8-oracle-arm32-vfp-hflt/jre/bin/java: not found ...
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1answer
64 views

Java IDEs won't open on my pi. How do I get them to open?

Of the preinstalled programming tools on raspbian all of them work except for the java IDEs(bluej and greenfoot). I've scoured the internet but have found nothing. really need to code in java for a ...
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1answer
56 views

Running videos on JavaFX in Raspberry Pi Zero

I am trying to run a program which shows a simple video through mediaView and then shows a QR code that is associated with a string that the program generates on javaFX in a Raspberry Pi Zero. I have ...
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How to install Java 12

I am trying to install java 12 on my pi. I can only use the terminal. Any Ideas what I have to do? it seems that java 12 isnt in the Repositorys. Thank you in advance
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Raspberry Pi Cam Stream to Android (Very Low Latency)

I've been looking for a way to get Pi Cam video streaming into an Android device and all Android Source code I found is very high latency. The only one I found was the ShawnBaker´s RPiCameraViewer ...
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Unable to run JAVA on Raspberry PI Zero? “VM is only supported on ARMv7+ VFP”

I am using Raspberry PI Zero W. I installed java 1.8 and 1.9 jdk's. Installation is successfully done. When i run the JAVA command on the RPi. Its shows error like: "Error occurred during ...
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1answer
293 views

Installing interactive brokers IB gateway on raspy 3B+

I found some posts that walk you through the installation but they are very old and don’t work anymore. I tried to install the oracle java for Arm Linux and then modify the IB installation script to ...
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1answer
86 views

Trying to understand where to start with Rasbperry PI, Java and Jazelle

My project in class is requiring me to get an audio player to work with Rasbperry, Java and Arm Jazelle technology. I've been reading here and there trying to understand what Jazelle is and how to use ...
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159 views

Cannot execute or open .jar files

hi have tried executing a .jar file using java -jar jarfilename.jar but it just returns: Error occurred during initialization of VM Server VM is only supported on ARMv7+ VFP and it returns the ...
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116 views

install eclipse luna on raspberry pi 3

I'm new here and I want to ask if there is any way to install eclipse luna or higher on raspberry pi. I'm using Rasbian and the already installed Eclipse (3.8) sudo apt install eclipse doesn't ...
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256 views

JSch / Java SDK 1.8 - getting Auth Fail from working key file

I'm having an issue with JSch using the ARM variant of Java 8. Using SSH works fine with the key: pi@raspberrypi:~ $ ssh -i .ssh/Pi2Desktop2 -p 22 astump@192.168.1.2 Welcome to Ubuntu 18.04.2 LTS (...
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2answers
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How do I make a Java application I made run as a deamon?

I have a Java Application is going to be my Discord Server's bot. How do I make this application run as a daemon on a Raspberry Pi, it uses the latest version of Raspbian and the Java application ...
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1answer
598 views

How can I install java on a raspberry pi running kali linux

I am trying out kali Linux on my raspberry pi for the first time, and I am trying to install java, as I use it a lot on my pi. I didn’t want to give this up because of my new os. However, when I try ...
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375 views

Using Java JNA and native library on Raspberry Pi

I am trying to use JNA on raspbian. I have installed libjna-java sudo apt-get install libjna-java When I run my java application I get an "java.lang.UnsatisfiedLinkError" for libjnidispatch.so. This ...
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147 views

JavaFX missing class JFXPanel

So I have an OpenJDK 8 installed on Raspbian Stretch; it crashes all the time. I then manually installed Oracle JDK 8u201 ; my app runs fine now no crashes. It misses JavaFX, though. I installed ...
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354 views

Python script unable to receive input from Java

I am quite aware that this might be more of a Java/Python problem but it's on the RasPi and I also don't know if Java or Python is the problem. So here is the situation: I have a python script ...
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1answer
1k views

Java 11 not working

I want to start experimenting with Java on a PI, following this guide http://docs.gluonhq.com/embedded/#_setting_up_the_raspberry_pi and started with PI ARMv6 rev 7 (v61) Kernel Linux 4.14.79+ ...
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157 views

Java error javax.net.ssl.SSLHandshakeException: when trying to read from webpage

I am using java to read from a webpage using this code: import java.net.*; import java.io.*; public class URLReader { public static void main(String[] args) throws Exception { URL oracle = new ...
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1answer
266 views

Fast pictures with PiCam and Java

I was already searching through forums and this stack exchange but I couldn't find anything that helps. So here is my problem. I have written a program in Java that analyzes pictures and outputs ...
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22 views

How can I gain internet access after a valid login? [duplicate]

I set up my iptables on my raspberry pi to redirect ALL traffic to localhost where my landing page is hosted, so that people on my AP can't access internet without logging in(correctly) first. On the ...
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35 views

BTS7960 pwm values

I have a BTS7960 h-bridge and I am trying to make a motor to move forward and backward using pwm values. I am using the pi4j library to control the pins. The pins L_EN and R_EN are initialized as ...
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1answer
58 views

My Raspberry Pi B+ has the Ri 2 B pinmap

I trying out different java programs for my RPi B+ V1.2 and as far I have only tried to blink with a lamp for a few seconds. It works. Now I want to try to blink with a lamp by using a button. In ...
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67 views

Music Sequence, which hardware and software is best? [closed]

This question is supposed to be subjective.. well I need to ask this one way or the other... soooo: As a project I wanted to create my own music sequencer (like a drum machine or synthesiser) from ...
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226 views

PI4J + Adafruit LCD with MCP23017

Got this device. Python example char_lcd_plate.py is working perfect. But I would like to manage it with Pi4J. I copied bits from python example LCD_PLATE_RS = 15 LCD_PLATE_RW ...
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2answers
333 views

I've researched it here but I still can't get a .jar file to run at startup on a raspberry pi

I admit I'm a complete noob at this, but I've done my homework on this site and I still can't get what I want to happen. I'm trying to get a .jar file to run at startup on a rasbpian installation. Let'...
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35 views

Java Audio Clip is not stopping at right time

I wrote a program to start and stop a wav file in Java which will run on pi 3/b. The program works well in windows pc but it doesn't works good in pi (Raspbian Installed). It stops the audio clip ...
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1answer
316 views

Gstreamer with Java | WARNING and Failed to load plugin

I try to launch the gst1-java binder on the Raspberry Pi 3B with the latest Raspbian Stretch and latest firmware. If I launch anything with gst-launch-1.0 it work great, I have hardware ...
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77 views

Browser swt on Raspberry Pi can't play audio when click a video on youtube

Firstly, I am sorry about my bad english. I am doing a web browser on Raspberry Pi. I use Java SWT Browser Widget and this browser work fine, but it don't play audio when i click a video on youtube. ...
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1answer
426 views

JavaFX and transparency

I'm working on a project who involve JavaFX and Omxplayer. On Windows, where I develop, my code works. I set my stage to stage.initStyle(StageStyle.TRANSPARENT); stage.setOpacity(0.5); On Windows, ...
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2answers
62 views

Raspberry Pi 3 getting hot over time

So I‘m currently working on a program to turn on or off my Philips Hue lights when I enter my room. The detection if somebody is coming or which direction he is going is provided by one HCSr505 and ...
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2answers
5k views

How do I set the default maximum Java heap size? [closed]

I want to set the default Java heap size to 1024m without needing to specify the -Xmx option every time I run a jar file. Tried adding export JAVA_OPTIONS=-Xmx1024m to .bashrc file but it didn't ...
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121 views

How to get stream of data from arduino serial monitor on Apache Edgent application (Java application)?

The sample java application for reading random sensor value is given as: package org.apache.edgent.samples.topology; import java.util.Random; import org.apache.edgent.function.Supplier; /** * ...
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1answer
893 views

ReentrantLock and right way to handle IllegalMonitorStateException

I'm doing some experiments with openHAB2 to control a simple relay that is linked to my garage lights. I've created a rule for this Switch item, so the relay can switch back to the ON state after one ...
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2answers
310 views

Pin state change event doesn't trigger

I recently bought a PIR Motion Sensor and wrote a java program which prints in the console whenever movement is detected. I connected the pins properly, and the signal to GPIO_17 according to the BCM ...
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1answer
104 views

How can i listen to input in very precise manner of microseconds. Like piscope. Using pigpio socket interface, pigs or liberary

I want to get time and count of input pulse in microseconds using pigpio. How can i Listen to gpio pin in spreate thread.
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1answer
977 views

PyCharm 2017.3.3 hangs

There is PyCharm, an IDE for programming Python. It's available in a Community edition for Linux as well. The problem affects (at least) version 2017.3.3. I installed it as a normal user with wget ...
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187 views

How to generate JRE fontconfig files on Arch ARM?

I'm trying to make a small Java application with UI and run it on Arch Linux ARM, but every time I try rendering a text, it crashes with the following error: Exception in thread "AWT-EventQueue-0" ...
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1answer
933 views

Opening jar in fullscreen in terminal [closed]

How can I open a JAR file in fullscreen? I mean that kind of fullscreen that it hides taskbar and other stuff like videogames in fullscreen mode. I remember finding a way a couple of months ago but ...
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1answer
807 views

Java program on Pi board

I am planning to start writing java program on raspberry Pi3. I found out some java IDE on Internet. I saw that NetBeans is most commonly use on raspberry Pi3. I am confuse, Do I need to install java ...
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0answers
343 views

Numpad keys don't throw KeyEvents under JavaFX on RPi3 [closed]

While programming a JavaFX application for the Raspberry Pi 3 using the official JavaFXPorts from Gluon, I encountered the following problem: Pressing the numpad keys on my keyboard doesn't give me ...
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1answer
377 views

GPIO (using sysfs problem)

I'm presently trying to use the built-in indicator lights on the Raspberry Pi B+ to provide status: Green = OK; Red = Problem After turning off the triggers (writing none to /sys/class/leds/led[0,1]...

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