Logging with SLF4J

Pi4J uses SLF4J for logging. To include it in your project, add this Maven dependency:

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-simple</artifactId>
    <version>2.0.0-alpha0</version>
</dependency>

There are different ways to configure the logging output, as described on the SLF4J website, but the shortest is probably with this property in your main-method:

public static void main(String[] args) throws Exception {
    // Configure default lolling level, accept a log level as the first program argument
    System.setProperty("org.slf4j.simpleLogger.defaultLogLevel", "INFO");
        
    // Your code comes here
}