Question

is there any way to serialize an expando subclass which can be retrieved with dynamically added properties. with the example;

class Sexpando extends Expando implements Serializable{
//String testProp
static final long serialVersionUID = -2056428816613381087L
String toString() {
    "an object of Sexpando - $serialVersionUID"
}
}

and

class SexpandoTest {

static main(args) {

    def s = new Sexpando()
    s.testProp = "small test string"
    println s.properties
    def file = new File('objects.dta')
    def out = file.newOutputStream()
    def oos = new ObjectOutputStream(out)
    oos.writeObject(s)

    oos.close()
    def retrieved = []

    file.eachObject { retrieved << it }

    retrieved.each { println it.properties }
}}

i get the output:

[testProp:small test string]
[:]

i also tried same example with original testProp field of Sexpando object (it is commented out above)

Groovy’s original Expando.java can be inspected from HERE

thank you for any advice!

Answer 1

I don’t think this is possible, it’s a long standing feature request, but as Jochen says, there is an issue with what Closures should be serialized to…