In response of @MiguelMunoz, here is a working implementation using LoggerContext.

Tested on JDK 17 with :

• org.slf4j:slf4j-api:2.0.10
• ch.qos.logback:logback-classic:1.5.12

package logger;

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.LoggerContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class LoggerTest {
  static final Logger LOGGER = LoggerFactory.getLogger(LoggerTest.class);

  public static void main(String[] args) {
    LOGGER.info("Should appear");
    LOGGER.debug("Should appear");

    LoggerContext ctx = (LoggerContext) LoggerFactory.getILoggerFactory();
    // Use the package name whose level you want to change
    ch.qos.logback.classic.Logger logger = ctx.getLogger("logger.LoggerTest");

    logger.setLevel(Level.INFO);
    LOGGER.debug("Should not appear");
    logger.setLevel(Level.DEBUG);
    LOGGER.debug("Should reappear");
  }
}