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package deleteme;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
 
public class DeleteMe {
 
    @SuppressWarnings("unchecked")
    public static void main(String[] args) throws Exception {
        sayHello();
    }
 
    private static void sayHello() {
        getLogger().warn("Hello");
        getLogger().fatal("World");
    }
    
    private static Logger getLogger() {
        if (logger == null) {
            //do this once, globally, not harmful to do it more often, just not needed
            try {
                File config = new File("logger.properties");
                InputStream is = new FileInputStream(config);
                PropertyConfigurator.configure(is);
            } catch (Exception e) {
                throw new RuntimeException(String.format("Crap.. log initialization failed! %", e.getLocalizedMessage()), e);
            }
            logger = Logger.getLogger(DeleteMe.class);
        }
        return logger;
    }
    
    private static Logger logger = null;
}