usage:
log.warn("abc: ", args, exception);
args are ignored.

See following code in LoggingEvent for more information:

public String getFormattedMessage() {
if (formattedMessage != null)

{ //here formattedMessage is "abc " return formattedMessage; // here it returns with out appending the args }

if (argumentArray != null)

{ formattedMessage = MessageFormatter.arrayFormat(message, argumentArray) .getMessage(); }

else

{ formattedMessage = message; }

return formattedMessage;
}