JUL to SLF4J Bridge

Question

I\'m currently observing that a 3rd party library (namely restfb) is using java.util.logging and I\'m seeing those logs end up in STDOUT even though I don\'t have an SLF4J c

Answer 1

As mentioned in the javadocs for SLF4JBridgeHandler, you get either install SLF4JBridgeHandler programmatically by invoking:

 // Optionally remove existing handlers attached to j.u.l root logger
 SLF4JBridgeHandler.removeHandlersForRootLogger();  // (since SLF4J 1.6.5)

 // add SLF4JBridgeHandler to j.u.l's root logger, should be done once during
 // the initialization phase of your application
 SLF4JBridgeHandler.install();

or via logging.properties

 // register SLF4JBridgeHandler as handler for the j.u.l. root logger
 handlers = org.slf4j.bridge.SLF4JBridgeHandler

As for performance, the section on jul-to-slf4j bridge discusses this issue. In essence, since you are already using logback, enabling the LevelChangePropagator should yield good performance regardless of the load.