Java Programming

I am making a logger for my code when sending data on the network. my logger is seen on a jtextarea. what i want is to change the color of a particular line when it encounters errors like exceptions to give emphasis on critical matters. Just like the "Output" in netbeans wherein there are different colors. Red text for exceptions, blue text for successful, black text for normal operations.

I tried to use this

jtextarea.setFont(new Font()) //forgot the parameters... : ) with color red for exceptions but the whole texts all turns to red...

any idea how? tnx in andvance