I'm starting to get into Domain Driven Design and am playing around with using repositories in my domain model. What I need to be able to do is inject the appropriate repositories into my domain objects when they are loaded. So I'm thinking I can use Hibernates event system and register a LoadEventListener to do this and I'm trying to understand exactly how to use the LoadEvent properties to accomplish what I want.
What I'd like to do is to actually instantiate the domain object in my listener, passing the needed repositories as constructor parameters. Then the DefaultLoadEventListener could finish saturating the object. But I'm not sure how to accomplish this.
I thought that maybe setting the instance to load property on the load event would work, but this results in NonUniqueObjectExceptions
Code:
[java] 14:41:46,450 INFO DefaultLoadEventListener:109 - Error performing load command
[java] org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: [org.hibernate.auction.Bid#1]
[java] at org.hibernate.event.def.DefaultLoadEventListener.load(DefaultLoadEventListener.java:148)
[java] at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:193)
[java] at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:101)
[java] at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878)
[java] at org.hibernate.impl.SessionImpl.internalLoad(SessionImpl.java:846)
[java] at org.hibernate.type.EntityType.resolveIdentifier(EntityType.java:266)
[java] at org.hibernate.type.EntityType.resolve(EntityType.java:303)
[java] at org.hibernate.type.EntityType.nullSafeGet(EntityType.java:217)
I thought that maybe if I set the result of the load event, it would build off that. Instead, the DefaultLoadEventListener ignores it and overrides it with a value that it creates.
Is there a way for me to instantiate the object to be saturated in my LoadEventListener or do I have to rely on Hibernate to do that and then manipulate the object?
Thanks,
Rich
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