Scala: print a stack trace in my Scalatra app

Question

Seems like a fairly straight forward problem, but I\'d like to log a stack trace when my top level error handler in Scalatra is triggered. I\'m intentionally throwing an excepti

Answer 1

This question has several ways to convert an exception stack trace to a String. printStackTrace outputs to System.err unless you provide a writer.

Answer 2

If you use the standard logger: com.typesafe.scalalogging.Logger , the logger prints the stack trace for you.

You can just use it this way:

import com.typesafe.scalalogging.Logger
import org.slf4j.LoggerFactory

try {     
    throw new Exception("test message")
} catch {
    case e:Exception => logger.error("Exception " , e)
}

There is already an overload which is accepting 2 parameters, String and Throwable.

Answer 3

I think you want printStackTrace() rather than getStackTrace. If you are outputting to a log file, getMessage() may be helpful. Or you may try passing the whole exception object to the logger.

Answer 4

Use ExceptionUtils from Apache Commons Lang:

import org.apache.commons.lang3.exception.ExceptionUtils
(...)
logger.info("an exception occurred: " + ExceptionUtils.getStackTrace(e))