Extension to Spring's Log4jConfigListener that uses log4j.configuration system property to read the log4j configuration from. If not specified falls back to the Spring's original behavior

SystemPropertyLog4jConfigurer.java

package hu.ka.log4j;

import org.springframework.util.Log4jConfigurer;
import org.springframework.web.util.Log4jConfigListener;

import javax.servlet.ServletContextEvent;
import java.io.FileNotFoundException;

public class SystemPropertyLog4jConfigurer extends Log4jConfigListener {

    @Override
    public void contextInitialized(ServletContextEvent event) {
        if (System.getProperty("log4j.configuration") != null) {
            try {
                Log4jConfigurer.initLogging(System.getProperty("log4j.configuration"));
            } catch (FileNotFoundException e) {
                System.err.print(e.getLocalizedMessage());
                super.contextInitialized(event);
            }
        } else {
            super.contextInitialized(event);
        }
    }
}