Groovy script which uses log4j, runs the list command, and gets the output

groovy.sh

#!/bin/bash
# Run a groovy script
# argument should be path to .groovy file
HIVEDIR="/usr/hdp/current/hive-client/lib"
# Include log4j properties in the classpath so we can do logging
JAVACP="log4j.properties"
# Need groovy-all jar to run groovy scripts
JAVACP="$JAVACP:$HIVEDIR/groovy-all-2.1.6.jar"
JAVACP="$JAVACP:$HIVEDIR/log4j-1.2.16.jar"
java -cp $JAVACP groovy.ui.GroovyMain $1

log4j.properties

log4j.rootLogger=DEBUG, CONSOLE, ROLLINGFILE

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
#log4j.appender.CONSOLE.Threshold=INFO
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} - %-5p [%t:%C{1}@%L] - %m%n

log4j.appender.ROLLINGFILE=org.apache.log4j.RollingFileAppender
#log4j.appender.ROLLINGFILE.Threshold=DEBUG
log4j.appender.ROLLINGFILE.File=script.log
log4j.appender.ROLLINGFILE.MaxFileSize=10MB
log4j.appender.ROLLINGFILE.MaxBackupIndex=10
log4j.appender.ROLLINGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.ROLLINGFILE.layout.ConversionPattern=%d{ISO8601} - %-5p [%t:%C{1}@%L] - %m%n

script.groovy

import org.apache.log4j.*
import groovy.util.logging.*

@Log4j
class Main {
  def execute() {
    // configure log4j
    PropertyConfigurator.configure("log4j.properties")
    //log.debug 'This is a debug message.'
    log.info 'Running script..'

    try {
        def stdout = new StringBuilder()
        def stderr = new StringBuilder()
        def proc = 'ls'.execute()
        proc.consumeProcessOutput(stdout, stderr)
        // wait for 10 seconds or kill
        proc.waitForOrKill 10000
        log.info "Standard out is ${stdout}"
        log.error "Standard error is ${stderr}"
        log.info "Return code is ${proc.exitValue()}"
      } catch (Exception e) {
        log.error 'Error running script', e
      }

  }
}

def main = new Main()
main.execute()