Hibernate+Jersey:no serializer for JavassistLazyInitializer

Steve Eastwood · **Joined:** Sun Feb 27, 2011 1:19 pm **Posts:** 4

Hello together,

i use hibernate3 (bundle) in a servlet.
Before a webservice function is closed, the lazyloaded values location in user shall be initilized with

Code:

Hibernate.initialize(rideSearch.locationStart);

hibernate correctly calls the database access, however the object is still refered to javassistLazyInitializer(id=190). Trying to marshalling it creates the error:

Code:

31.03.2011 01:12:14 org.apache.catalina.core.StandardWrapperValve invoke
SCHWERWIEGEND: Servlet.service() for servlet *** Web Service threw exception
org.codehaus.jackson.map.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: de.***ReturnSearch["rideSearch"]->de***RideSearch["user"]->de***model.User_$$_javassist_1["handler"])

When Hibernate.initialize is called the "variables" in eclipse show the following change:
* user.location.handler changes from false to true
* user.location.handler.target is correctly filled with all the data

For some reason the actuall java class is not filled with the data of user.location.handler.target though. Could anybody give me a hint?

Thank you very much!!

mmerder · **Posted:** Thu Mar 31, 2011 3:39 am

Hibernate can not replace the proxy-object when initializing it, as you could have other pointers to that object. If you want it to be of your entity-class and not a subclass you need to fetch it eagerly.

Steve Eastwood · **Joined:** Sun Feb 27, 2011 1:19 pm **Posts:** 4

Since dynamicly complex data is loaded which then is put into a new model, this approach is very complex to realise. If this needs to be done, i don't see an advantage of hibernate anymore.

I found two other solutions, which i both don't work (yet).

1. jackson-module-hibernate (https://github.com/FasterXML/jackson-module-hibernate)
this seems to cover exactly what i am looking for. The instructions to register the ObjectMapper are only for Spring and i did not found a possibility how to do this in Jersey. Can anybody help me with that?

2. In some cases it seems that this error is produced by a circular reference (http://forum.springsource.org/showthread.php?t=98764). I doublechecked this. In my case there is no circular reference.

Can anybody give me a hint or share a link. I'm pretty stuck.

Thank you very much!