Copy Groovy class properties

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I think the best and clear way is to use InvokerHelper.setProperties method

Example:

import groovy.transform.ToString
import org.codehaus.groovy.runtime.InvokerHelper

@ToString
class User {
    String name="Arturo"
    String city = 'Madrid'
    Integer age = 27
}

@ToString
class AdminUser {
    String name
    String city
    Integer age
}

def user = new User()
def adminUser = new AdminUser()

println "before: $user $adminUser"
InvokerHelper.setProperties(adminUser, user.properties)
println "after : $user $adminUser"

Output:

before: User(Arturo, Madrid, 27) AdminUser(null, null, null)
after : User(Arturo, Madrid, 27) AdminUser(Arturo, Madrid, 27)

Note: If you want more readability you can use category

use(InvokerHelper) {
    adminUser.setProperties(user.properties) 
}

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