Caused by: java.lang.NullPointerException: null
	at org.hibernate.persister.entity.AbstractPropertyMapping.getSuperCollection(AbstractPropertyMapping.java:285)
	at org.hibernate.persister.entity.AbstractPropertyMapping.addPropertyPath(AbstractPropertyMapping.java:198)
	at org.hibernate.persister.entity.AbstractPropertyMapping.initPropertyPaths(AbstractPropertyMapping.java:395)
	at org.hibernate.persister.entity.AbstractEntityPersister.initOrdinaryPropertyPaths(AbstractEntityPersister.java:2300)
	at org.hibernate.persister.entity.AbstractEntityPersister.initPropertyPaths(AbstractEntityPersister.java:2347)
	at org.hibernate.persister.entity.AbstractEntityPersister.postConstruct(AbstractEntityPersister.java:3906)
	at org.hibernate.persister.entity.JoinedSubclassEntityPersister.<init>(JoinedSubclassEntityPersister.java:563)

private Collection getSuperCollection(MetadataImplementor metadata, PersistentClass clazz1, PersistentClass commonPersistentClass, String propertyName) {
    Class<?> c1 = clazz1.getMappedClass();
    Class<?> c2 = commonPersistentClass.getMappedClass();
    MappedSuperclass commonMappedSuperclass = null;

    // First we traverse up the clazz2/commonPersistentClass super types until we find a common type
    while ( !c2.isAssignableFrom( c1 ) ) {
        if ( commonPersistentClass == null) {
/* L285 */  if ( commonMappedSuperclass.getSuperPersistentClass() == null ) {
                commonMappedSuperclass = commonMappedSuperclass.getSuperMappedSuperclass();
                commonPersistentClass = null;
            }
            else {
                commonPersistentClass = commonMappedSuperclass.getSuperPersistentClass();
                commonMappedSuperclass = null;
            }
        }
        else {
            if ( commonPersistentClass.getSuperclass() == null ) {
                commonMappedSuperclass = commonPersistentClass.getSuperMappedSuperclass();
                commonPersistentClass = null;
            }
            else {
                commonPersistentClass = commonPersistentClass.getSuperclass();
                commonMappedSuperclass = null;
            }
        }
    }
    
    // Then we traverse it's types up as long as possible until we find a type that has a collection binding
    while ( c2 != Object.class ) {
        if ( commonMappedSuperclass != null ) {
            Collection collection = metadata.getCollectionBinding( commonMappedSuperclass.getMappedClass().getName() + "." + propertyName );
            if ( collection != null ) {
                return collection;
            }

            if ( commonMappedSuperclass.getSuperPersistentClass() == null ) {
                commonMappedSuperclass = commonMappedSuperclass.getSuperMappedSuperclass();
                commonPersistentClass = null;
            }
            else {
                commonPersistentClass = commonMappedSuperclass.getSuperPersistentClass();
                commonMappedSuperclass = null;
            }
        }
        else {
            Collection collection = metadata.getCollectionBinding( commonPersistentClass.getEntityName() + "." + propertyName );
            if ( collection != null ) {
                return collection;
            }

            if ( commonPersistentClass.getSuperclass() == null ) {
                commonMappedSuperclass = commonPersistentClass.getSuperMappedSuperclass();
                commonPersistentClass = null;
            }
            else {
                commonPersistentClass = commonPersistentClass.getSuperclass();
                commonMappedSuperclass = null;
            }
        }
    }

    return null;
}