Regular Expression to Replace System.out.println with Log4j

Tim — Mon, 29 Dec 2008 14:32:10 +0000

This is nothing fancy, but may help some of you log4j newbies.

I found myself replacing a project's hideous System.out.println statements with log4j log calls.

Just do a File Search in eclipse , tick the regular expression box and do a Replace:

Find: System\.out\.println\("(.+?)"\);
Replace: log.info("\1");

Now you just have to go in and add your imports and your log field variable to your classes.

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Limiting log4j SMTPAppender

Tim — Fri, 15 Feb 2008 14:43:21 +0000

I wanted to set a maximum amount of e-mails that SMTPAppender would send after filling up a mailbox with 30,000 damn e-mails.

Turns out it was pretty damn easy, I set up my appender in a java class, and the SMTP appender has a method called setEvaluator that takes an instance of TriggeringEventEvaluator, so I just created a quick inner class like so.

class LimitingEvaluator implements TriggeringEventEvaluator
{
private int sentEvents = 0;
private int MAX_EVENTS = 20;
@Override
public boolean isTriggeringEvent(LoggingEvent arg0) {
sentEvents++;
if(sentEvents>= MAX_EVENTS)
return false;
return true;
}

}

and when i set up my appender I do this

appender.setEvaluator(new LimitingEvaluator());

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We Heart Code » logging

Regular Expression to Replace System.out.println with Log4j

Limiting log4j SMTPAppender