Error marshalling a Groovy object

[siaspa]

This example tries to marshal a simple Groovy object, but it raises the following exception

Caused by: java.lang.IllegalAccessException: Class org.eclipse.yasson.internal.model.GetFromGetter can not access a member of class sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedTypeBaseImpl with modifiers "public final"
at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:102)

Maybe it's better to limit the reflection to symbols added in GroovyObject subclasses...in many cases it's what we expect to marshal.

import javax.json.bind.Jsonb
import javax.json.bind.JsonbBuilder

class Square {
    Integer size = 10;
}

class GroovyYassonBugTest {

    static void main(String[] args) {
        Square square = new Square()

        Jsonb jsonb = JsonbBuilder.create()
        String jsonString = jsonb.toJson(square);
    }
}

[aguibert]

Hi @siaspa, thanks for raising this issue.

I tried to use your provided code to reproduce the issue, and I had to change Square so it was a public static inner class of the main class like this:

import javax.json.bind.Jsonb
import javax.json.bind.JsonbBuilder

class GroovyYassonBugTest {

    public static class Square {
        Integer size = 10;
    }

    static void main(String[] args) {
        Square square = new Square()

        Jsonb jsonb = JsonbBuilder.create()
        String jsonString = jsonb.toJson(square);
    }
}

From here Yasson actually attempted to serialize the object, but ran into an infinite loop that resulted in either a StackOverflowException or an OOM.

After inspecting the resulting Groovy class I see that Groovy adds in a public MetaClass getMetaClass() method which seems to be the culprit for the infinite loop. I added a special case in PR #302 to automatically ignore this method and then the code worked for me.