Steve Ebersole That's what the stack trace hints towards if I read this right:
{{
cannot assign instance of org.hibernate.proxy.pojo.javassist.SerializableProxy to field com.annetic.common.entity.BaseEntity.creater of type com.annetic.common.entity.User in instance of com.annetic.factory.core.entity.ModelOrderColor
at java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2089)
}}

Looks like there already is an entry in the Cache (that overflows to Disk, and is serialized), when the value get overwritten, ehcache faults the old value in, but deserializing this seems to fail.
I suspect the org.hibernate.proxy.pojo.javassist.SerializableProxy was put in the Cache as part of the CacheKey, all hypothetical though ...