I have an Enum class RoleType
public enum RoleType {
SYSTEM_ADMIN, PROJECT_ADMIN, USER;
}
In my User
entity class, I've the following mapping for the enum collection. This is the Java
code:
@JsonProperty
@ElementCollection
@Enumerated(EnumType.STRING)
@CollectionTable(name = "user_role", joinColumns = @JoinColumn(name = "user_id"))
private Set<RoleType> roles;
I converted this User
entity class to Kotlin
and here is the code:
@JsonProperty
@Enumerated(EnumType.STRING)
@ElementCollection
@CollectionTable(name = "user_role", joinColumns = arrayOf(JoinColumn(name = "user_id")))
var roles: kotlin.collections.Set<RoleType>? = null
After the conversion, hibernate is throwing the following exception:
Collection has neither generic type or OneToMany.targetEntity() defined: com.a.b.model.User.roles
It was working fine before in Java.
I also tried adding the targetClass
in @ElementCollection
like this:
@ElementCollection(targetClass = RoleType::class)
but it's also throwing another exception.
Fail to process type argument in a generic declaration. Member : com.a.b.model.User#roles Type: class sun.reflect.generics.reflectiveObjects.WildcardTypeImpl
ERROR [2017-05-27 04:46:33,123] org.hibernate.annotations.common.AssertionFailure: HCANN000002: An assertion failure occurred (this may indicate a bug in Hibernate)
! org.hibernate.annotations.common.AssertionFailure: Fail to process type argument in a generic declaration. Member : com.a.b.model.User#roles Type: class sun.reflect.generics.reflectiveObjects.WildcardTypeImpl
Note: If i change the modifier of roles
from var
to val
, it's working, but i need this to be a mutable type. I don't understand how the mutability of a field is creating issues in hibernate.
Note: I'm using Kotlin 1.1.2-2 & Hibernate 5.2 version.
Have you tried changing
var roles: Set<RoleType>? = null
to
var roles: MutableSet<RoleType>? = null
If you have a look at the interface definition of Set
, you'll see it's defined as public interface Set<out E> : Collection<E>
whereas MutableSet
is defined as public interface MutableSet<E> : Set<E>, MutableCollection<E>
Set<out E>
's Java equivalent I believe is Set<? extends E>
instead of what you were looking for Set<E>
.
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