Configure logging for the MongoDB Java driver

Another way to do set MongoDB's log level:

import java.util.logging.Logger;
Logger mongoLogger = Logger.getLogger( "com.mongodb" );
mongoLogger.setLevel(Level.SEVERE); // e.g. or Log.WARNING, etc.

You don't have to do this before using any of the driver classes, you can set/change log levels at any time.

Anyone still facing this problem with new version mongodb driver 3.x?

define a logger for mongo driver package in log4j.properties

log4j.logger.org.mongodb.driver=INFO

com.mongodb has changed to org.mongodb.

You need to set a couple of system properties before loading any of the MongoDB Java driver classes:

// Enable MongoDB logging in general
System.setProperty("DEBUG.MONGO", "true");

// Enable DB operation tracing
System.setProperty("DB.TRACE", "true");

After doing that the driver will use the standard Java logging framework to log messages.

Unfortunately, as far as I can tell from the Java driver code, the logging granularity is not all that fine - for example you cannot selectively log operations on a specific collection.