Does work @ManyToMany(fetch = FetchType.EAGER)?

luca.preziati · **Joined:** Thu May 05, 2011 6:33 am **Posts:** 16

I have annotated a relation as follow

Code:

   @ManyToMany(fetch = FetchType.EAGER)
   @MapKeyColumn(name = "E_TPSISDK_K_ORDINAMENTO")
   @JoinTable(name = "V_DCM_TYPE_CLASS", joinColumns = {
         @JoinColumn(name = "K_DOCUMENTO_AZIENDALE", referencedColumnName = "K_DOCUMENTO_AZIENDALE"),
         @JoinColumn(name = "K_SOTTO_APPLICAZIONE", referencedColumnName = "K_SOTTO_APPLICAZIONE") }, inverseJoinColumns = {
         @JoinColumn(name = "K_CLASSE_DOCUMENTALE", referencedColumnName = "K_CLASSE_DOCUMENTALE"),
         @JoinColumn(name = "N_FOLDER_DOCUMENTO", referencedColumnName = "N_FOLDER_DOCUMENTO") })
   private Map<SystemId, DocumentClass> docClassMap = new HashMap<SystemId, DocumentClass>();

When I use Hessian to Serialize the Entity which contains this relation, I always have:

Caused by: com.caucho.hessian.io.HessianFieldException: it.nacon.gedi.typeregistry.domain.DocumentType.docClassMap: java.util.Map cannot be assigned from null
at com.caucho.hessian.io.JavaDeserializer.logDeserializeError(JavaDeserializer.java:677) ~[hessian-3.2.0.jar:na]
at com.caucho.hessian.io.JavaDeserializer$ObjectFieldDeserializer.deserialize(JavaDeserializer.java:400) ~[hessian-3.2.0.jar:na]
at com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:233) ~[hessian-3.2.0.jar:na]
at com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:157) ~[hessian-3.2.0.jar:na]
at com.caucho.hessian.io.SerializerFactory.readObject(SerializerFactory.java:378) ~[hessian-3.2.0.jar:na]
at com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2051) ~[hessian-3.2.0.jar:na]
at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1977) ~[hessian-3.2.0.jar:na]
at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1969) ~[hessian-3.2.0.jar:na]
at com.caucho.hessian.io.CollectionDeserializer.readList(CollectionDeserializer.java:78) ~[hessian-3.2.0.jar:na]
at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1700) ~[hessian-3.2.0.jar:na]
at com.caucho.hessian.client.HessianProxy.invoke(HessianProxy.java:220) ~[hessian-3.2.0.jar:na]
at $Proxy71.getTypes(Unknown Source) ~[na:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.0_21]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) ~[na:1.6.0_21]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) ~[na:1.6.0_21]
at java.lang.reflect.Method.invoke(Method.java:597) ~[na:1.6.0_21]
at org.springframework.remoting.caucho.HessianClientInterceptor.invoke(HessianClientInterceptor.java:222) ~[spring-web-3.0.4.RELEASE.jar:3.0.4.RELEASE]
... 61 common frames omitted
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection, no session or session was closed

Why Hibernate try a lazy inizialization of this collection?

johnhunsley · **Posted:** Wed Nov 21, 2012 8:05 am

Did you ever find a solution to this? I have exactly the same error when using Hessian.

Many thanks.

luca.preziati · **Joined:** Thu May 05, 2011 6:33 am **Posts:** 16

Before Serializing with Hessian we remove all hibernate thing.

So, we take all element and we remove Hibernate List and Hibernate Map, but, moreover we scroll all element, so are inizialize. But this is not the solution, is a solution for bypassing the problem.

We do it bacause we cache all that data, and quite never change, one time per month.