Property file: loaded from JAVA_HOME not from classpath

To route JUL to slf4j, use https://stackoverflow.com/questions/6020545/send-redirect-route-java-util-logging-logger-jul-to-logback-using-slf4j

Then add the following

SLF4JBridgeHandler.removeHandlersForRootLogger(); // (since SLF4J 1.6.5)

SLF4JBridgeHandler.install();

It only route the request, the filter JUL is still apply

Need to update manually

Logger l = Logger.getLogger(AppMambuV1.class.getName());

l.info("info");

l.fine("fine1");

l.setLevel(Level.FINER);

l.fine("fine2");

Then update log4j

log4j.logger.com.mambu=TRACE

Springboot

JUL is routed to slf4j autoamtically, no need to add logging.property.

Just set in application.properties

logging.level.com.mambu=TRACE