Is there any way to specify Log4J 2.x log4j2.xml file location manually (like DOMConfigurator in Log4J 1.x), without messing with classpath and system properties?
8 Answers
You could use the static method #initialize(String contextName, ClassLoader loader, String configLocation) (see source here) in org.apache.logging.log4j.core.config.Configurator.
(You can pass null for the class loader.)
Be aware that this class is not part of the public API so your code may break with any minor release.
For completeness, you can also specify the location of the configuration file with this system property:
-Dlog4j.configurationFile=path/to/log4j2.xmlIn Windows, be aware that you need to use a URI with the log4j.configurationFile property
-Dlog4j.configurationFile=file://C:\path\to\log4j2.xmlIf you are using log4j2 and properties are in defined in log4j2.properties file then use this.
3-Dlog4j2.configurationFile=file:/home/atul/log4j2.properties
For log4j version 2.12.1, you can find how to reconfigure log4j2 here.
Below is an example
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.LoggerContext;
File file = new File("C:\\Path for Windows OS\\yourConfig.xml");
LoggerContext context = (LoggerContext) LogManager.getContext(false);
context.setConfigLocation(file.toURI());
Logger log = LogManager.getLogger(YourClass.class);It seems to me that way of configuring log4j2 is changing with new releases, so you should be aware of that.
Using the LoggerContext allows to setConfigLocation.
File f = new File(this.logConfigFile);
URI fc = f.toURI();
System.out.println("Loading logging config file: " + fc);
Logger l = (Logger) LogManager.getLogger(LogManager.ROOT_LOGGER_NAME);
l.getContext().setConfigLocation(fc);or alternatively
LoggerContext.getContext().setConfigLocation(java.net.URI);You can initialize like below as well
ConfigurationSource source = new ConfigurationSource(new FileInputStream(log4j file Path));
XmlConfiguration xmlConfig = new XmlConfiguration(source);
Logger logger = (Logger) LogManager.getLogger();
logger.getContext().start(xmlConfig); In each class you can get logger instance as below
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
private final Logger logger = LogManager.getLogger(ABC.class);Step: 1 - Get ready with your log4J.xml file with the appender details (Mostly under the resource folder)
Step: 2 - Following code should be added to the configuration class (In the previous log4J we had PropertyConfigurator and now we need to go with LoggerContext)
String log4JFilePath = "file path of your log4J.xml file";
LoggerContext loggerContext = (LoggerContext)LoggerManager.getContext(false);
File file = new File(log4JFilePath);
loggerContext.setConfigLocation(file.toURI());Step: 3 - Add the following line to utilise the logger in any classes
private static final Logger logger = LogManager.getLogger(yourClassName.class);
logger.info("log here"); import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.core.config.Configurator;
public class Foo { public static void main(String[] args) { Configurator.initialize(null, "src/main/config/log4j2.xml"); //path specify Logger logger = LogManager.getLogger(APITestToolMain.class); logger.info("working"); }
}resource:
