Hello,
I experienced some Issues using ToString and AutoClone on Entities
(Spring JPA).
Both can lead to endless loops / a stackoverflow, when classes reference
each other.
While it's fine for AutoClone, I think the generated toString-Method
should recognize it was already called once and return a dummy value or
just the object reference.
Anyway, I got bigger issues using AutoClone:
1. I use an abstract class to add auditing columns to all my tables. All
my Entities inherit from that class (AbstractEvent in this example).
Since these fields should be empty/null on cloning, I'd like to omit the
AutoClone annotation on that class. But this leads to an error: No
signature of method: Event.cloneOrCopyMembers() is applicable for
argument types: (Event) values: [Event(null, null, [], Event@54d9d12d)].
2. SubEvent objects within Event.subEvents were not cloned.
import groovy.transform.AutoClone
import groovy.transform.Canonical
import groovy.transform.ToString
import static groovy.transform.AutoCloneStyle.SIMPLE
@AutoClone(style=SIMPLE) //1. error when you remove this
abstract class AbstractEvent {
Date created
String createdBy
Date modified
String modifiedBy
}
@AutoClone(style=SIMPLE)
@ToString(includeSuper = true)
class Event extends AbstractEvent {
Long id
String someText
ArrayList<SubEvent> subEvents = new ArrayList();
}
@AutoClone(style=SIMPLE)
@ToString(includeSuper = true, excludes = ['event'])
class SubEvent extends AbstractEvent {
Long id
String someText
Event event;
}
public static void main(String[] args){
Event event = new Event(
id: 1,
someText: "Event 1",
created: new Date(),
createdBy: "me");
SubEvent subEvent1 = new SubEvent(
id: 1,
someText: "SubEvent 1",
event: event);
event.subEvents += subEvent1
Event clonedEvent = event.clone()
assert !event.is(clonedEvent)
assert !event.subEvents.is(clonedEvent.subEvents)
assert !event.subEvents.first().is(clonedEvent.subEvents.first())
// 2. fails
}
Hope, you can help me here.
Kind Regards
Nikolai
