Immutable+Newify+CompileStatic

imnewco.groovy

import groovy.transform.*

@Immutable class Coordinates {
    double latitude, longitude
}

@Immutable class Path {
    Coordinates[] coordinates
}

@Newify([Coordinates, Path])
@CompileStatic
def build() {
    Path(
        Coordinates(48.824068d, 2.531733d),
        Coordinates(48.857840d, 2.347212d),
        Coordinates(48.858429d, 2.342622d)
    )
}

assert build().coordinates.size() == 3