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GELF implementation in Java and log4j appender without any dependencies.

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package org.graylog2.log;

import org.apache.log4j.spi.LoggingEvent;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 *
 * @author Anton Yakimov
 * @author Jochen Schalanda
 */
public class Log4jVersionChecker {

	private static Method methodGetTimeStamp = null;

	static {
		Method[] declaredMethods = LoggingEvent.class.getDeclaredMethods();
		for (Method m : declaredMethods) {
			if (m.getName().equals("getTimeStamp")) {
				methodGetTimeStamp = m;
				break;
			}
		}
	}

	public static long getTimeStamp(LoggingEvent event) {
		long timeStamp = 0;
		if (methodGetTimeStamp != null) {
			try {
				timeStamp = (Long) methodGetTimeStamp.invoke(event);
			} catch (IllegalAccessException e) {
				// Just return the current timestamp
			} catch (InvocationTargetException e) {
				// Just return the current timestamp
			}
		}
		return timeStamp == 0 ? System.currentTimeMillis() : timeStamp;
	}
}