Executing command in Groovy (using Ant)

gistfile1.groovy

def execute(String command, List<String> parameters) {
    def ant = new AntBuilder()
    ant.exec(outputproperty:"cmdOut",
            errorproperty: "cmdErr",
            resultproperty:"cmdExit",
            failonerror: "true",
            executable: command) {
        arg(line: parameters.join(" "))
    }
    [exitCode: ant.project.properties.cmdExit, stderr: ant.project.properties.cmdErr, stdout: ant.project.properties.cmdOut]
}