Debugging and Logging in Lift Using SBT

Im trying to get basic logging and debugging working in Lift using the SBT. Im using Eclipse as an editor but do开发者_Go百科ing all the compilation with SBT. Can anyone suggest how to print debug statements/logging to the SBT console?

If you want to have logging with Logback, you need to create a basic xml file named src/main/resources/props/default.logback.xml (the filename can be different to reflect development and production environments, but we’ll keep it simple).

In this file, a basic configuration which will log to the console looks like:

<configuration>
  <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
      <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
    </encoder>
  </appender>

  <root level="debug">
    <appender-ref ref="STDOUT" />
  </root>
</configuration>

(More examples can be found in the Logback manual.)

Next, you’ll need to add the dependency

"ch.qos.logback" % "logback-classic" % "0.9.26"

to your sbt configuration.

Finally, if you want to log from a class, mix in the trait Logger and you get all the debug, info, warn,… methods in scope.

class SomeClass extends SomeOtherClass with Logger {
    debug("Class initialised.")
}

Or, alternatively mix in Loggable which does not pollute your namespace and only provides a logger proxy method.

class SomeClass extends SomeOtherClass with Loggable {
    logger.debug("Class initialised.")
}

For more info, have a look at the Lift wiki.

In sbt there is console-quick command that loads web site environment in your command line. It's not a real time debugging tool that has break point, step by step execution but you can call methods on command line see the actual results which is sometimes really helpful.