JUL to SLF4J Bridge

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You need to call SLF4JBridgeHandler.install(). You also need to enable all log levels at the root logger (reason in excerpt below) in java.util.logging and remove the default console appender.

This handler will redirect jul logging to SLF4J. However, only logs
enabled in j.u.l. will be redirected. For example, if a log statement
invoking a j.u.l. logger disabled that statement, by definition, will
not reach any SLF4JBridgeHandler instance and cannot be redirected.

The whole process can be accomplished like so

import java.util.logging.Logger;
import org.slf4j.bridge.SLF4JBridgeHandler;

SLF4JBridgeHandler.removeHandlersForRootLogger();
SLF4JBridgeHandler.install();
Logger.getLogger("").setLevel(Level.FINEST); // Root logger, for example.

You can set the level to something higher than finest for performance reasons, but you won’t be able to turn those logs on without enabling them in java.util.logging first (for the reason mentioned above in the excerpt).

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