So basically, I am having a problem with Hibernate HQL Projection using the AliasToBeanResultTransformer, the result I am trying to get isn't being mapped properly to the bean.
The HQL query that I am using is this:
Code:
select entity.categoryTypes as categoryTypes from nz.co.doltech.ims.server.entities.IncidentEntity entity where (entity.id = :id105019)
I want to get the CategoryType's from the IncidentEntity based on its join relationship. This works fine when I'm not attempting to use any transformer on it. categoryTypes is a Set and the transformer keeps trying to check the Method's parameter types and fails because instead of finding a CategoryTypeEntity it finds a java.util.Set as if its trying to map a single CategoryTypeEntity into the categoryTypes field. I would have thought that because its a Set it would pull the data out as a Set and then try map it to the categoryTypes field. Apparently not though.
Code:
@javax.persistence.Entity(name = "incidents")
@Cache(usage=CacheConcurrencyStrategy.TRANSACTIONAL)
public class IncidentEntity implements Entity {
...
@ManyToMany(fetch = FetchType.LAZY)
@JoinTable(name = "incident_categorytype", joinColumns = {
@JoinColumn(name = "incident_id", nullable = false, updatable = false) },
inverseJoinColumns = {
@JoinColumn(name = "categorytype_id", nullable = false, updatable = false)
})
private Set<CategoryTypeEntity> categoryTypes = new HashSet<CategoryTypeEntity>();
...
public Set<CategoryTypeEntity> getCategoryTypes() {
return categoryTypes;
}
public void setCategoryTypes(Set<CategoryTypeEntity> categoryTypes) {
this.categoryTypes = categoryTypes;
}
}
Here is the call I make:
Code:
Query query = session.createQuery("select entity.categoryTypes as categoryTypes from nz.co.doltech.ims.server.entities.IncidentEntity entity " +
"where (entity.id = :id105019)")
query.setResultTransformer(Transformers.aliasToBean(IncidentEntity.class));
return query.list();
The exceptions I get are:
Code:
Caused by: org.hibernate.PropertyAccessException: IllegalArgumentException occurred while calling setter of nz.co.doltech.ims.server.entities.IncidentEntity.categoryTypes
...
Caused by: java.lang.IllegalArgumentException: argument type mismatch
And the hibernate log message is:
Code:
Jun 27, 2014 12:32:11 AM org.hibernate.property.BasicPropertyAccessor$BasicSetter set
SEVERE: IllegalArgumentException in class: nz.co.doltech.ims.server.entities.IncidentEntity, setter method of property: categoryTypes
Jun 27, 2014 12:32:11 AM org.hibernate.property.BasicPropertyAccessor$BasicSetter set
SEVERE: expected type: java.util.Set, actual value: nz.co.doltech.ims.server.entities.CategoryTypeEntity
Using Hibernate 3.6.10I am using second-level caching with ehcache setup using Spring.
Can anyone see what is going on here? It really doesn't seem like normal behavior, perhaps I have done something wrong. Would appreciate any help I can get!
UPDATE: This is strange, not directly related to the issue. When I have hibernates use_query_cache property set to true I keep getting the projection result as null in the AliasToBeanResultTransformer (then the result returns as null (or [null, null, null] depending on how many are returned. I think this might be a bug? In regards to the issue at hand, when I remove the result transformer it returns 3 CategoryTypeEntites as expected, but not in a Set<>. When its added I get one CategoryTypeEntity that's being processed in the Transformers transformTuple method. Really confused about both of these issues.
Cheers, Ben
Stackoverflow Post: http://stackoverflow.com/questions/24431693/hibernate-hql-projection-issue-with-set-using-aliastobeanresulttransformer
Login
FAQ
Search