I had written some code for a specific type accessor (java URI) that worked very well with Hibernate 3.2.6 GA
(has been running for more than 1.5 years now)

Trying to migrate to 3.5.0 Final, I first found out that I needed to implement one more method in my accessor code

public Member getMember() {
return this.method;
}

but after this running the code I run into the following exception and stacktrace:

09 Apr 2010 17:14:20,620 ERROR [main] (BuildImageEnv.java:BuildImageEnv:94) - Error java.lang.IllegalArgumentException: Cannot determine java-type from given member [null]
java.lang.IllegalArgumentException: Cannot determine java-type from given member [null]
at org.hibernate.ejb.metamodel.AttributeFactory$BaseAttributeMetadata.<init>(AttributeFactory.java:608)
at org.hibernate.ejb.metamodel.AttributeFactory$SingularAttributeMetadataImpl.<init>(AttributeFactory.java:688)
at org.hibernate.ejb.metamodel.AttributeFactory$SingularAttributeMetadataImpl.<init>(AttributeFactory.java:678)
at org.hibernate.ejb.metamodel.AttributeFactory.determineAttributeMetadata(AttributeFactory.java:550)
at org.hibernate.ejb.metamodel.AttributeFactory.buildAttribute(AttributeFactory.java:93)
at org.hibernate.ejb.metamodel.MetadataContext.wrapUp(MetadataContext.java:183)
at org.hibernate.ejb.metamodel.MetamodelImpl.buildMetamodel(MetamodelImpl.java:66)
at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:83)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:883)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
...

any clues about why this could happen

nobody answer here , don't waste your time !!!!!!!!!