Change location log4j.properties

Question

I want to put all my configuration files in the /config subfolder of my application directory. Log4j expects the log4j.properties file in the root folder of my application. Is there a way to tell log4j where to look for the properties file?

Answer 1

Yes, define the log4j.configuration property

 java -Dlog4j.configuration=file:/path/to/log4j.properties myApp 

Note that the property value must be a URL.

For more information, see the section "Initialization Procedure by Default" in the Log4j manual .

Answer 2

You can use the PropertyConfigurator to download your log4j.properties files, wherever they are on disk.

Example:

 Logger logger = Logger.getLogger(this.getClass()); String log4JPropertyFile = "C:/this/is/my/config/path/log4j.properties"; Properties p = new Properties(); try { p.load(new FileInputStream(log4JPropertyFile)); PropertyConfigurator.configure(p); logger.info("Wow! I'm configured!"); } catch (IOException e) { //DAMN! I'm not.... } 

If you have an XML Log4J configuration, use DOMConfigurator .

Answer 3

Use PropertyConfigurator: PropertyConfigurator.configure (configFileUrl);

Answer 4

Refer to this example taken from - http://www.dzone.com/tutorials/java/log4j/sample-log4j-properties-file-configuration-1.html

 import org.apache.log4j.Logger; import org.apache.log4j.PropertyConfigurator; public class HelloWorld { static final Logger logger = Logger.getLogger(HelloWorld.class); static final String path = "src/resources/log4j.properties"; public static void main(String[] args) { PropertyConfigurator.configure(path); logger.debug("Sample debug message"); logger.info("Sample info message"); logger.warn("Sample warn message"); logger.error("Sample error message"); logger.fatal("Sample fatal message"); } } 

To change the logger levels - Logger.getRootLogger().setLevel(Level.INFO);

Answer 5

In Eclipse, you can set the VM argument:

 -Dlog4j.configuration=file:///${workspace_loc:/MyProject/log4j-full-debug.properties} 

Answer 6

This is my class: Path is fine and properties loaded.

 package com.fiserv.dl.idp.logging; import java.io.File; import java.io.FileInputStream; import java.util.MissingResourceException; import java.util.Properties; import org.apache.log4j.Logger; import org.apache.log4j.PropertyConfigurator; public class LoggingCapsule { private static Logger logger = Logger.getLogger(LoggingCapsule.class); public static void info(String message) { try { String configDir = System.getProperty("config.path"); if (configDir == null) { throw new MissingResourceException("System property: config.path not set", "", ""); } Properties properties = new Properties(); properties.load(new FileInputStream(configDir + File.separator + "log4j" + ".properties")); PropertyConfigurator.configure(properties); } catch (Exception e) { e.printStackTrace(); } logger.info(message); } public static void error(String message){ System.out.println(message); } }