Configure logging for the MongoDB Java driver

Question

Can I configure the MongoDB Java driver to output useful (for debugging) messages, ideally using one of the standard logging frameworks? I'd mainly be interested in seeing each query that goes out, how much data was received and how long it took, as well as any error codes.

Answer 1

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.