Failing scripts in groovy using Grab - groovy

Question

The following groovy scripts fail using command line
#Grab("org.apache.poi:poi:3.9")
println "test"
Error:
unexpected token: println # line 2, column 1.
println "test"
^
1 error
Removing the Grab, it works!
Anything I missed?
$>groovy -v
Groovy Version: 2.1.7 JVM: 1.7.0_25 Vendor: Oracle Corporation OS: Linux

Answer 1

Annotations can only be applied to certain targets. See SO: Why can't I do a method call after a #Grab declaration in a Groovy script?
#Grab("org.apache.poi:poi:3.9")
dummy = null
println "test"
Alternatively you can use grab as a method call:
import static groovy.grape.Grape.grab
grab(group: "org.apache.poi", module: "poi", version: "3.9")
println "test"
For more information refer to Groovy Language Documentation > Dependency management with Grape.

Answer 2

File 'Grabber.groovy'
package org.taste
import groovy.grape.Grape
//List<List[]> artifacts => [[<group>,<module>,<version>,[<Maven-URL>]],..]
static def grab (List<List[]> artifacts) {
ClassLoader classLoader = new groovy.lang.GroovyClassLoader()
def eal = Grape.getEnableAutoDownload()
artifacts.each { artifact -> {
Map param = [
classLoader: classLoader,
group : artifact.get(0),
module : artifact.get(1),
version : artifact.get(2),
classifier : (artifact.size() < 4) ? null : artifact.get(3)
]
println param
Grape.grab(param)
}
}
Grape.setEnableAutoDownload(eal)
}
Usage :
package org.taste
import org.taste.Grabber
Grabber.grab([
[ "org.codehaus.groovy.modules.http-builder", "http-builder", '0.7.1'],
[ "org.postgresql", "postgresql", '42.3.1', null ],
[ "com.oracle.database.jdbc", "ojdbc8", '12.2.0.1', null]
])