how to use logback configured via logback.groovy with groovy

Question

I am not able to use logback configured via logback.groovy with groovy.

If in a directory i have a script file called for example FooBar.groovy and the file logback.groovy when i run groovy FooBar.groovy groovy tries to compiles the logback configuration file too and my script doesn't work, i have to fallback to the default xml configuration file for logback (logback.xml).

How can i make this to works? can i call groovy somefiles.groovy and configure groovy to ignore logback.groovy?

Thanks for the help

Answer 1

The reason for your problems is that the logback configuration file should never be compiled. It is read at runtime from LogBack via GroovyShell or a similar mechanism.

The solution depends on your project setup. Following you will find a solution for a project build with Gradle following the Maven Standard Directory Layout:

First file is src/main/groovy/Test.groovy:

import org.slf4j.Logger
import org.slf4j.LoggerFactory

class Test {
    static Logger LOG = LoggerFactory.getLogger(Test.class)

    static void main(String[] args) {
        LOG.debug("Test")
    }
}

Second file is src/main/resources/logback.groovy:

import static ch.qos.logback.classic.Level.INFO
import static ch.qos.logback.classic.Level.DEBUG

import ch.qos.logback.classic.encoder.PatternLayoutEncoder
import ch.qos.logback.core.ConsoleAppender

appender("CONSOLE", ConsoleAppender) {
  encoder(PatternLayoutEncoder) {
    pattern = "%-4relative [%thread] - %msg%n"
  }
}
root(DEBUG, ["CONSOLE"])

I omitted the Gradle build file (build.gradle).

The standard directory layout guarantees that every file in src/main/groovy is compiled, while everything in src/main/resources is included in the class path. So LogBack is able to find that file at runtime.

Update: Didn't read your problem carefully enough. I could not manage to solve the problem when both files are in the same directory and I start it via groovy Test.groovy. I think this is not possible. The groovy command always compiles all groovy files in the current directory and in the given classpath.