Logging
By default, Scalatra uses Logback for logging.
You can easily add logging facilities to your project, if you’ve got the
logging dependency in your project/build.scala
file:
"ch.qos.logback" % "logback-classic" % "1.1.2" % "runtime"
In your servlet or filter class:
import org.slf4j.{Logger, LoggerFactory}
class YourServlet extends ScalatraServlet {
val logger = LoggerFactory.getLogger(getClass)
get("/") {
logger.info("foo")
// whatever else you want to put in the body of the action
}
}
This will get you basic logging support. There are some additional logging libraries you might want to investigate: slf4s and grizzled-slf4j, which act as Scala wrappers around slf4j.
The Scala wrappers use by-name parameters for the log message, and
check to see that the logging level is enabled. This is a performance
win for complex log messages involving expensive toString
s or many
concatenations.