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ProGuard is a free shrinker, optimizer, obfuscator, and preverifier for Java bytecode

There is a newer version: 7.6.0

/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2021 Guardsquare NV
 */

package proguard.logging;

import org.apache.logging.log4j.*;
import org.apache.logging.log4j.core.*;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.LoggerConfig;

public class Logging
{
    public static void configureVerbosity(boolean verbose) {
        LoggerContext ctx          = (LoggerContext) LogManager.getContext(LogManager.class.getClassLoader(), false);
        Configuration config       = ctx.getConfiguration();
        LoggerConfig  loggerConfig = config.getRootLogger();
        loggerConfig.setLevel(verbose ? Level.INFO : Level.WARN);
        ctx.updateLoggers();
    }
}