How to insert a Linebreak in a log4j message?

[MJalbert]

Hi all,

I need some help with the log4j pattern. I have to build the message with all the stacktrace aligned and when I try to use the "\n" or Character.LINE_SEPARATOR, it gives me the unknown character (square) in my log file instead of the line break (I use a FileAppender).

Here is my code:

Code:

String date = CalendarUtil.getActualDate();
		String time = CalendarUtil.getActualTime();
 
		StringBuffer sb = new StringBuffer();
 
		byte lb = Character.LINE_SEPARATOR;
 
		sb.append("Date: "date" "+time+lb);
		sb.append("Type: "+exceptionType+lb);
		sb.append("Description: "+description+lb);
 
		for (int i = 0; i < stackTraceElements.length; i++) {
			StackTraceElement stackTraceElement = stackTraceElements;
			if (i == 0) {
				sb.append("Error: "+stackTraceElement.toString()+lb);
			} else {
				sb.append("      "+stackTraceElement.toString()+lb);
			}
		}
		
		super.error(sb.toString());

And here is the result (change the # for squares):

Date: 2008-03-04 16:02:49#Type: java.lang.Exception#Description: My hardcoded message.#Error: main.view.ExecuteTask.main(ExecuteTask.java:46)

I can't create a pattern with the line break (%NL) because every stacktrace has a diferent number of line.

Is anyone knows why it's giving me that result and how could I fix that?

Thanks a lot,


MJalbert

[MJalbert]

Hi all,

The solution is so simple that it's almost stupid (like usual). The trick is to create a log for every line of your error message. Like this:

Code:

super.error("Date: "+date+" "+time);
super.error("Type: "+exceptionType);
super.error("Description: "+description);

for (int i = 0; i < stackTraceElements.length; i++) {
	StackTraceElement stackTraceElement = stackTraceElements[i];
	if (i == 0) {
		super.error("Error: "+stackTraceElement.toString());
	} else {
		super.error("      "+stackTraceElement.toString());
	}
}
super.error("");

I hope it will help someone one day!

Thanks,

MJalbert