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'MongoDB java driver. The custom builder for update operations.' post illustration
MongoDB java driver. The custom builder for update operations.

Java driver for MongoDB does not provide any utility classes that could help with building update queries. If you want to create a query to update or increment field values, you usually have to use BasicDBObjectBuilder. This is intuitive approach, but queries defined in such a way are quite hard to read and maintain.

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'How to intercept and log stdout and stderr messages with log4j' post illustration
How to intercept and log stdout and stderr messages with log4j

Log4j doesn't allow to catch stdout and stderr messages out of the box. However, you can still intercept them with a custom output stream, which is especially useful when you have to log data that third-party libraries write to the standard streams.

This has already been done by Jim Moore (have a look at the LoggingOutputStream in the log4j source code). The issue is that this LoggingOutputStream requires org.apache.log4j.Category and org.apache.log4j.Priority which are now partially deprecated.