[logback-dev] [JIRA] (LOGBACK-871) Unable to load logback.xml in multiple classloader jvm.

Thu, 06 Jun 2013 03:43:49 -0700

David Roussel commented on Bug LOGBACK-871

ThisadeeP, how can this be fixed in logback?

We could generate and exception, get he stacktrace, and find the classloader of the calling class, hoping that would have logback.xml in it. But that class might be a utility class (hibernate, spring), not an application class, so might not work.

Maybe you just need to manually init logback from code.

I do this in a ServletContextListener which is registered in web.xml.

This is my version, but you could put any logic in there, like finding the full path of logback.xml...

import ch.qos.logback.classic.LoggerContext;
import org.slf4j.ILoggerFactory;
import org.slf4j.LoggerFactory;
import org.slf4j.bridge.SLF4JBridgeHandler;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

/**
 * Initialise logging at application start up.
 */
public class InitLoggingListener implements ServletContextListener {
	@Override
	public void contextInitialized(ServletContextEvent servletContextEvent) {

		if (System.getProperty("logback.configurationFile") == null) {
			System.setProperty("logback.configurationFile", "myapp.logback.xml");
		}

		// Optionally remove existing handlers attached to j.u.l root logger,
		// including console handler
		SLF4JBridgeHandler.removeHandlersForRootLogger();

		// Bridge java.util.logging into SLF4J, and thus logback
		SLF4JBridgeHandler.install();
	}

	@Override
	public void contextDestroyed(ServletContextEvent servletContextEvent) {
		shutdownLogging();
	}

	/**
	 * Flush and close all logging files
	 */
	private static void shutdownLogging() {

		// We do a logback specific check here, but shouldn't fail if
		// we ever move away from logback to another slf4j logging
		// implementation
		ILoggerFactory loggerFactory = LoggerFactory.getILoggerFactory();
		if (loggerFactory instanceof LoggerContext) {
			LoggerContext context = (LoggerContext) loggerFactory;
			context.stop();
		}
	}
}
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