Missing Hello,
missing support for generics is clearly apparent in conjuction with use of @ javax.persistence.MappedSuperclass annotation .
Let's have a generic superclass:
{code:title=HelloWorldSuperclass.java|borderStyle=solid}
@MappedSuperclass
public abstract class HelloWorldSuperclass<KeyType, ValueType> {
@EmbeddedId
private KeyType key;
@Column(name="value")
private ValueType value;
}
{code}
Then define type specific subclass:
{code:title=HelloWorldInteger.java|borderStyle=solid}
@Entity
public abstract class HelloWorldInteger extends HelloWorldSuperclass<Integer, String> {
}
{code}
And another one for variety sake:
{code:title=HelloWorldString.java|borderStyle=solid}
@Entity
public abstract class HelloWorldString extends HelloWorldSuperclass<String, String> {
}
{code}
*Resulting metamodel classes do not have correct types where expected. All parametrized types are translated to mere Object in superclass and subclasses.*
{code:title=generated metamodel classes|borderStyle=solid}
@Generated(value = "org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor")
@StaticMetamodel(HelloWorldSuperclass.class)
public abstract class HelloWorldSuperclass_ {
public static volatile SingularAttribute<HelloWorldSuperclass, Object> value;
public static volatile SingularAttribute<HelloWorldSuperclass, Object> key;
}
@Generated(value = "org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor")
@StaticMetamodel(HelloWorldInteger.class)
public abstract class HelloWorldInteger_ extends HelloWorldSuperclass_ {
}
@Generated(value = "org.hibernate.jpamodelgen.JPAMetaModelEntityProcessor")
@StaticMetamodel(HelloWorldString.class)
public abstract class HelloWorldString_ extends HelloWorldSuperclass_ {
}
{code}
*This is rather inconvenient and impossible to use reasonably further on in CriteriaBuilder.*
Tomas
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