Hi, I have a entity User that have an @ElementCollection of Address (@Embeddable) with a @ElementCollection of AddressType.

I attach the test case.

This is the stack trace:

Caused by: java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:819)
at java.util.ArrayList$Itr.remove(ArrayList.java:805)
at org.hibernate.cfg.Configuration.originalSecondPassCompile(Configuration.java:1633)
at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1390)
at org.hibernate.cfg.Configuration.generateDropSchemaScript(Configuration.java:941)
at org.hibernate.tool.hbm2ddl.SchemaExport.<init>(SchemaExport.java:213)