Quick&Dirty Log4J conf (inline)

log4j.java

import java.util.Properties;
import org.apache.log4j.PropertyConfigurator;

class MyDummyApp {
  public static void main(String []args) {
    Properties properties=new Properties();
    properties.setProperty("log4j.rootLogger","DEBUG,stdout");
    properties.setProperty("log4j.rootCategory","DEBUG");

    properties.setProperty("log4j.appender.stdout",     "org.apache.log4j.ConsoleAppender");
    properties.setProperty("log4j.appender.stdout.layout",  "org.apache.log4j.PatternLayout");
    properties.setProperty("log4j.appender.stdout.layout.ConversionPattern","%d{yyyy/MM/dd HH:mm:ss.SSS} [%5p] %t (%F) - %m%n");

    PropertyConfigurator.configure(properties);

    //...
  }
}

this helps: -Dlog4j.debug