Exception stack trace in logger

[M Mehta]

Hi All,

I am using log4j for logging. I want that whenever any exception comes in the application it should get printed in the log file. I am not able to find way to do this. Can you please help me? here is the l4j.properties I have created:

log4j.rootCategory=debug, stdout, rolling

#### First appender writes to console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%d{dd-MM-yy HH:mm:ss}]: %c: %m%n

#Using rolling file appender so that logs are backedup daily
log4j.appender.rolling=org.apache.log4j.DailyRollingFileAppender
log4j.appender.rolling.threshold=INFO
log4j.appender.errorlogfile.DatePattern = '.'yyyy-MM-dd'.log' 

#The file in which logs would be appended.
log4j.appender.rolling.File=logfile.log
log4j.appender.rolling.layout=org.apache.log4j.PatternLayout
log4j.appender.rolling.layout.ConversionPattern=[%d{dd-MM-yy HH:mm:ss}]: %c %L: %m%n

Thanks

[Gokul Nanthakumar]

You need to log through code like log.info, log.error, etc in your code....

[M Mehta]

I am using the logging functions already to log the errors.

 catch (SOAPException e) {
              logger.error("Error in the handler" + e);
               e.printStackTrace();
}

but it doesn't print the complete exception trace to the log file, I have tried with e.getLocalizedMessage() and e.toString() methods as well.

I want the exception to get logged in the logger the way it is printed on the console, with complete stack trace. I am sure it should be possible.

Thanks,
Me

[Jaikiran Pai]

logger.error("Error in the handler" + e);

Have you tried the overloaded method which accepts a Throwable for the second param? Like this one.

[M Mehta]

Thanks for the response Jaikiran, the method with Throwable as argument is working fine

One more problem which I have to resolve. In the code, many times exception may come which has not been handled. I want in case of any exception the track trace should get printed to the log file, the way its done on the console. Is this possible with Log4j?

[David Newton]

Log4J doesn't magically wrap uncaught or unlogged exceptions. I seem to remember an uncaught exception listener or something you could attach a log statement to, though.