Sometimes the ObjectDB throws an internal exception if a find() was executed.
It is a sporadic issue that occurs only with Objectdb 2.7.0_b2 and only if the entites are enhanced. (We don't enabled the new property "objectdb.temp.extended-ref-retrieval" from http://www.objectdb.com/database/forum/1161)
With the previous version (2.7.0_b1) we don't get the exceptions.
Two stack traces we observed:
com.objectdb.o.InternalException: Unexpected internal exception at com.objectdb.o.JPE.h(JPE.java:168) at com.objectdb.o.ERR.f(ERR.java:66) at com.objectdb.o.OBC.onObjectDBError(OBC.java:1560) at com.objectdb.jpa.EMImpl.find(EMImpl.java:607) at com.objectdb.jpa.EMImpl.find(EMImpl.java:519)
and
com.objectdb.o.InternalException: Unexpected internal exception at com.objectdb.o.UserException.g(UserException.java:93) at com.objectdb.o.OBC.aN(OBC.java:906) at com.objectdb.jpa.EMImpl.find(EMImpl.java:599) at com.objectdb.jpa.EMImpl.find(EMImpl.java:519)