[1.2.4] Why does this work in 1.2.3 but fails in 1.2.4 - @ElementCollection with nested @Embeddable

[chesrae]

Consider the following three simplified classes

@Entity
public class Game extends Model {
@ElementCollection
public List<Interval> intervals;
}

@Embeddable
public class Interval {
@Embedded @AttributeOverride(name = "secondsElapsed", column =
@Column(name = "begin_seconds"))
public Instant begin;
@Embedded @AttributeOverride(name = "secondsElapsed", column =
@Column(name = "end_seconds"))
public Instant end;
}

@Embeddable
public class Instant {
public int secondsElapsed;
}


This code runs fine in 1.2.3 and produces the expected schema but
fails to load the application in 1.2.4.
I can certainly accept criticism that this is not the best design but
I am curious as to why it began to fail in 1.2.4
Any help would be greatly appreciated.

Stack Trace produced by 1.2.4:

Oops: ArrayIndexOutOfBoundsException
An unexpected error occured caused by exception
ArrayIndexOutOfBoundsException: 0

play.exceptions.UnexpectedException: Unexpected Error
at play.Play.start(Play.java:545)
at play.Play.detectChanges(Play.java:618)
at play.Invoker$Invocation.init(Invoker.java:198)
at Invocation.HTTP Request(Play!)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
at
org.hibernate.persister.collection.AbstractCollectionPersister.initCollectionPropertyMap(AbstractCollectionPersister.java:
1735)
at
org.hibernate.persister.collection.AbstractCollectionPersister.initCollectionPropertyMap(AbstractCollectionPersister.java:
1711)
at
org.hibernate.persister.collection.AbstractCollectionPersister.<init>(AbstractCollectionPersister.java:
599)
at
org.hibernate.persister.collection.BasicCollectionPersister.<init>(BasicCollectionPersister.java:
74)
at
org.hibernate.persister.PersisterFactory.createCollectionPersister(PersisterFactory.java:
104)
at
org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:
307)
at
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:
1842)
at
org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:
902)
at play.db.jpa.JPAPlugin.onApplicationStart(JPAPlugin.java:240)
at
play.plugins.PluginCollection.onApplicationStart(PluginCollection.java:
480)
at play.Play.start(Play.java:515)