Pi4J does not work correctly with PI5 in a Java

[Kvazarrius]

Hello
When this code is executed, the signal is sent to pin 27 and freezes. There it is not possible to turn off these commands

relay.low();
relay.state(DigitalState.LOW);

the program does not respond

import com.pi4j.context.Context;
import com.pi4j.Pi4J;
import com.pi4j.io.gpio.digital.DigitalOutput;
import com.pi4j.io.gpio.digital.DigitalOutputConfig;
import com.pi4j.io.gpio.digital.DigitalState;

public class Main {
    public static void main(String[] args) throws InterruptedException {
        Context pi4j = Pi4J.newAutoContext();

        DigitalOutputConfig config = DigitalOutput.newConfigBuilder(pi4j)
                .id("LED")
                .name("Simple LED Control")
                .address(27)
                .shutdown(DigitalState.LOW)
                .initial(DigitalState.LOW)
                .build();

        Thread.sleep(1000);

        var relay = pi4j.create(config);
        System.out.println(relay.state());

        relay.high();
        relay.low();
        relay.state(DigitalState.LOW);

        pi4j.shutdown();
    }
}

    implementation("com.pi4j:pi4j-core:2.7.0")
    implementation("com.pi4j:pi4j-plugin-raspberrypi:2.7.0")
    implementation("com.pi4j:pi4j-plugin-gpiod:2.7.0")

How to properly apply and remove a signal from a pin? Examples from https://www.pi4j.com/documentation/io-examples/digital-output/ - do not work
Raspberry Pi 5 Model B
Linux, version: 6.6.62+rpt-rpi-2712, architecture: aarch64
Java version: Version: 17.0.13, runtime: 17.0.13+12-LTS, vendor: BellSoft

[taartspi]

My pi5 is using 2.7.1-SNAPSHOT but I do not believe this entails updates to the gpiod provider I am using. The gpiod provider is required as the only Pi5 provider available. I created a program using your code and connecting an LED to GPIO27. It runs to completion as expected the LED illumination is not visible as the pin is driven high and immediately drive low. Using the debugger I see the LED go on and then off.

Detected OS: Name: Linux, version: 6.6.62+rpt-rpi-2712, architecture: aarch64
2025-01-12 12:26:23:521 -0600 [main] INFO com.pi4j.boardinfo.util.BoardInfoHelper - Detected Java: Version: 21.0.3, runtime: 21.0.3+9-LTS, vendor: Azul Systems, Inc., vendor version: Zulu21.34+19-CA
2025-01-12 12:26:23:547 -0600 [main] INFO com.pi4j.boardinfo.util.BoardInfoHelper -

[FDelporte]

Indeed a sleep is needed in between high and low.

relay.high();
Thread.sleep(2000);
relay.low()

[Kvazarrius]

Many thanks to those who responded!
Problem solved. Indeed, connecting the diode to pin 17 or 27 - my example works correctly.
I forgot to say that in my case, the diode was previously connected through a relay, as in the figure below. Apparently powering the relay from 5v and using a control voltage of 3.3v is unacceptable. For this purpose I will create a separate topic.

[FDelporte]

Thanks for the remark, I added a warning to this documentation page about "level shifting":
https://www.pi4j.com/getting-started/understanding-the-pins/#digital-gpio

[taartspi]

The Pi only operates at 3.3v and fairly low current level. Some
Of those relay boards operate at 3.3v input but need to validate the current requirement as some control the relay directly and won't work where some isolate the relay behind transistors and will work.