GITHUB PROJECT: https://github.com/Pi4J/pi4j-example-fatjar
The “Minimal example application” uses one LED and button to demonstrate
the basic use of Pi4J V.2. When building that project with Maven, all the required Java modules are copied to the
target/distribution directory. But a lot of developers like to produce a single, executable JAR that contains
all dependencies, also known as a “FAT JAR”.
The repository “pi4j-example-fatjar” GitHub project contains a Maven project with identical wiring, dependencies and build command to the “Minimal example application”, but results in such a FAT JAR instead of separate Java modules.
By using three build plugins the FAT JAR is created:
For the full description, take a look at the README.md in the sources and the page “Build as a FAT JAR with Maven”.
Build with:
mvn clean package
Once the build is complete and was successful, you can find the compiled FAT JAR pi4j-example-fatjar.jar in the
target directory. You can build directly on your Raspberry Pi or if you are developing on a different computer, copy the file
to your Raspberry Pi with (in this example the Pi has IP 192.168.0.252):
scp target/pi4j-example-fatjar.jar pi@192.168.0.252://home/pi
On the Raspberry Pi open a terminal, or via SSH from your PC, execute this command:
$ java -jar pi4j-example-fatjar.jar
[main] INFO com.pi4j.util.Console -
[main] INFO com.pi4j.util.Console - ************************************************************
[main] INFO com.pi4j.util.Console - ************************************************************
[main] INFO com.pi4j.util.Console -
[main] INFO com.pi4j.util.Console - <-- The Pi4J Project -->
[main] INFO com.pi4j.util.Console - Minimal Example project
[main] INFO com.pi4j.util.Console -
[main] INFO com.pi4j.util.Console - ************************************************************
[main] INFO com.pi4j.util.Console - ************************************************************
[main] INFO com.pi4j.util.Console -
[main] INFO com.pi4j.Pi4J - New auto context
[main] INFO com.pi4j.Pi4J - New context builder
[main] INFO com.pi4j.runtime.impl.DefaultRuntime - Initializing Pi4J context/runtime...
[main] WARN com.pi4j.runtime.impl.DefaultRuntime - Replacing provider DIGITAL_OUTPUT RaspberryPi Digital Output (GPIO) Provider with priority 0 with provider GpioD Digital Output (GPIO) Provider with higher priority 150
[main] WARN com.pi4j.runtime.impl.DefaultRuntime - Replacing provider DIGITAL_INPUT RaspberryPi Digital Input (GPIO) Provider with priority 0 with provider GpioD Digital Input (GPIO) Provider with higher priority 150
[main] INFO com.pi4j.library.gpiod.internal.GpioDContext - Using chip gpiochip0 pinctrl-bcm2711
[main] INFO com.pi4j.platform.impl.DefaultRuntimePlatforms - adding platform to managed platform map [id=raspberrypi; name=RaspberryPi Platform; priority=5; class=com.pi4j.plugin.raspberrypi.platform.RaspberryPiPlatform]
[main] INFO com.pi4j.runtime.impl.DefaultRuntime - Pi4J context/runtime successfully initialized.
[main] INFO com.pi4j.util.Console - --------------------
[main] INFO com.pi4j.util.Console - | Pi4J PLATFORMS |
[main] INFO com.pi4j.util.Console - --------------------
[main] INFO com.pi4j.util.Console -
PLATFORMS: [1] "Pi4J Runtime Platforms" <com.pi4j.platform.impl.DefaultPlatforms>
PLATFORM: "RaspberryPi Platform" {raspberrypi} <com.pi4j.plugin.raspberrypi.platform.RaspberryPiPlatform> {Pi4J Platform for the RaspberryPi series of products.}
[main] INFO com.pi4j.util.Console -
[main] INFO com.pi4j.util.Console - ---------------------------
[main] INFO com.pi4j.util.Console - | Pi4J DEFAULT PLATFORM |
[main] INFO com.pi4j.util.Console - ---------------------------
[main] INFO com.pi4j.util.Console -
PLATFORM: "RaspberryPi Platform" {raspberrypi} <com.pi4j.plugin.raspberrypi.platform.RaspberryPiPlatform> {Pi4J Platform for the RaspberryPi series of products.}
[main] INFO com.pi4j.util.Console -
[main] INFO com.pi4j.util.Console - --------------------
[main] INFO com.pi4j.util.Console - | Pi4J PROVIDERS |
[main] INFO com.pi4j.util.Console - --------------------
[main] INFO com.pi4j.util.Console -
PROVIDERS: [6] "I/O Providers" <com.pi4j.provider.impl.DefaultProviders>
DIGITAL_INPUT: [1] <com.pi4j.io.gpio.digital.DigitalInputProvider>
PROVIDER: "GpioD Digital Input (GPIO) Provider" {gpiod-digital-input} <com.pi4j.plugin.gpiod.provider.gpio.digital.GpioDDigitalInputProviderImpl> {com.pi4j.plugin.gpiod.provider.gpio.digital.GpioDDigitalInputProviderImpl}
SERIAL: [1] <com.pi4j.io.serial.SerialProvider>
PROVIDER: "RaspberryPi Serial Provider" {raspberrypi-serial} <com.pi4j.plugin.raspberrypi.provider.serial.RpiSerialProviderImpl> {com.pi4j.plugin.raspberrypi.provider.serial.RpiSerialProviderImpl}
I2C: [1] <com.pi4j.io.i2c.I2CProvider>
PROVIDER: "RaspberryPi I2C Provider" {raspberrypi-i2c} <com.pi4j.plugin.raspberrypi.provider.i2c.RpiI2CProviderImpl> {com.pi4j.plugin.raspberrypi.provider.i2c.RpiI2CProviderImpl}
DIGITAL_OUTPUT: [1] <com.pi4j.io.gpio.digital.DigitalOutputProvider>
PROVIDER: "GpioD Digital Output (GPIO) Provider" {gpiod-digital-output} <com.pi4j.plugin.gpiod.provider.gpio.digital.GpioDDigitalOutputProviderImpl> {com.pi4j.plugin.gpiod.provider.gpio.digital.GpioDDigitalOutputProviderImpl}
SPI: [1] <com.pi4j.io.spi.SpiProvider>
PROVIDER: "RaspberryPi SPI Provider" {raspberrypi-spi} <com.pi4j.plugin.raspberrypi.provider.spi.RpiSpiProviderImpl> {com.pi4j.plugin.raspberrypi.provider.spi.RpiSpiProviderImpl}
ANALOG_OUTPUT: [0] <com.pi4j.io.gpio.analog.AnalogOutputProvider>
ANALOG_INPUT: [0] <com.pi4j.io.gpio.analog.AnalogInputProvider>
PWM: [1] <com.pi4j.io.pwm.PwmProvider>
PROVIDER: "RaspberryPi PWM Provider" {raspberrypi-pwm} <com.pi4j.plugin.raspberrypi.provider.pwm.RpiPwmProviderImpl> {com.pi4j.plugin.raspberrypi.provider.pwm.RpiPwmProviderImpl}
[main] INFO com.pi4j.util.Console -
[main] INFO com.pi4j.util.Console - -------------------
[main] INFO com.pi4j.util.Console - | Pi4J REGISTRY |
[main] INFO com.pi4j.util.Console - -------------------
[main] INFO com.pi4j.util.Console -
REGISTRY: [2] "I/O Registered Instances" <com.pi4j.registry.impl.DefaultRegistry>
IO: "Press button" {button} <com.pi4j.plugin.gpiod.provider.gpio.digital.GpioDDigitalInput> {DIN-24}
IO: "DOUT-22" {DOUT-22} <com.pi4j.plugin.gpiod.provider.gpio.digital.GpioDDigitalOutput> {DOUT-22}
[main] INFO com.pi4j.util.Console -
[main] INFO com.pi4j.util.Console - LED high
[main] INFO com.pi4j.util.Console - LED low
[main] INFO com.pi4j.util.Console - LED high
[main] INFO com.pi4j.util.Console - LED low
[Pi4J.RUNTIME-1] INFO com.pi4j.util.Console - Button was pressed for the 1th time
[main] INFO com.pi4j.util.Console - LED high
[main] INFO com.pi4j.util.Console - LED low
[main] INFO com.pi4j.util.Console - LED high
[main] INFO com.pi4j.util.Console - LED low
[Pi4J.RUNTIME-1] INFO com.pi4j.util.Console - Button was pressed for the 2th time
[main] INFO com.pi4j.util.Console - LED high
[main] INFO com.pi4j.util.Console - LED low
[main] INFO com.pi4j.util.Console - LED high
[main] INFO com.pi4j.util.Console - LED low
[main] INFO com.pi4j.util.Console - LED high
[Pi4J.RUNTIME-1] INFO com.pi4j.util.Console - Button was pressed for the 3th time
[main] INFO com.pi4j.util.Console - LED low
[main] INFO com.pi4j.util.Console - LED high
[main] INFO com.pi4j.util.Console - LED low
[Pi4J.RUNTIME-1] INFO com.pi4j.util.Console - Button was pressed for the 4th time
[main] INFO com.pi4j.util.Console - LED high
[main] INFO com.pi4j.util.Console - LED low
[main] INFO com.pi4j.util.Console - LED high
[main] INFO com.pi4j.util.Console - LED low
[main] INFO com.pi4j.util.Console - LED high
[Pi4J.RUNTIME-1] INFO com.pi4j.util.Console - Button was pressed for the 5th time
[main] INFO com.pi4j.runtime.impl.DefaultRuntime - Shutting down Pi4J context/runtime...
[main] INFO com.pi4j.plugin.gpiod.provider.gpio.digital.GpioDDigitalInput - Shutdown input listener for button
[main] INFO com.pi4j.util.ExecutorPool - Shutting down executor pool Pi4J.RUNTIME
[main] INFO com.pi4j.runtime.impl.DefaultRuntime - Pi4J context/runtime successfully shutdown. Dispatching shutdown event.