Question

I’d like to remove the timestamp from GWT logging output on the console.

What’s the simplest way to do this? Ideally, in the .gwt.xml configuration would be great.

Here is an example output currently with the timestamp:

Wed Mar 21 08:23:57 EDT 2012 Job 
FINE: Job: 'updater': end

EDIT: I am only interested in the client side.

Answer 1

This logging capability is not really configurable. You need to write your own formatter:
call this at the beginning of onModuleLoad():

Handler[] handlers = Logger.getLogger("").getHandlers();
for(Handler h : handlers){
  h.setFormatter(new MyCustomLogFormatter());
}

And here is an example of a formatter:

public class MyCustomLogFormatter extends TextLogFormatter{
    private static DateTimeFormat timeFormat = DateTimeFormat.getFormat("HH:mm:ss.SSS");
    public MyCustomLogFormatter() {
        super(true);
    }

    @Override
    public String format(LogRecord event) {
        StringBuilder message = new StringBuilder();
        message.append(getRecordInfo(event, " "));
        message.append(event.getMessage());
        message.append(getStackTraceAsString(event.getThrown(), "\n", "\t"));
        return message.toString();
    }
    @Override
    protected String getRecordInfo(LogRecord event, String newline) {
        Date date = new Date(event.getMillis());
        StringBuilder s = new StringBuilder();
        s.append(timeFormat.format(date));
        s.append(" GWT ");
        s.append(event.getLevel().getName());
        String loggerName = event.getLoggerName();
        String[] split = loggerName.split("\\.");
        s.append(" ");
        s.append(split[split.length-1]);
        s.append(newline);
        s.append(": ");
        return s.toString();
      }
}

More: http://code.google.com/webtoolkit/doc/latest/DevGuideLogging.html