Exception when logging an object

[undso]

With the Log4 API it is possible to log java.lang.Object an not only String.
The class org.apache.log4j.Category contains the methode:

public void info(Object message) { [...] }

If you try to log such an object you'll get an IllegalArgumentException in the methode org.bson.BasicBSONEncoder._putObjectField().

To fix this issue we should change a line in the LoggingEventBsonifierImpl.
From nullSafePut(result, KEY_MESSAGE, loggingEvent.getMessage());
To nullSafePut(result, KEY_MESSAGE, loggingEvent.getRenderedMessage());