CODEWITHSUNDEEP
springgenericstypes
user1491636
user1491636

Reputation: 2436

Proper use of Spring's ResolvableType to determine generic type

I'm attempting to use Spring's org.springframework.core.ResolvableType to figure out the parameterized type at runtime as such:

public class MyClass<T> implements MyInterface<T> {
    private final Class<T> typeClass;

    public CustomStateSerializer() {
        ResolvableType type = ResolvableType.forClass(getClass());
        ResolvableType genericType = type.getGeneric();
        this.typeClass= (Class<T>) genericType.resolve();
    }
}

...

new MyClass<MyType>();

Unfortunately, genericType results to ?. Clearly I'm not using it correctly and I can't seem to find any good docs for the solution.

Upvotes: 3

Views: 5172

Answers (2)

Stalin Gino
Stalin Gino

Reputation: 622

default Class<T> getEntityClass() {
    return (Class<T>) ResolvableType.forClass(getClass())
        .as(VersionedRepository.class)
        .getGeneric(0)
        .resolve();
}

This would work

Upvotes: 0

jordiburgos
jordiburgos

Reputation: 6302

The class is only has reference to which is not defined yet. So you can pass the instance that will have an specific already:

    ResolvableType type = ResolvableType.forClass(getClass(), this);
    this.typeClass = type.getGeneric(0).resolve();

Upvotes: -1

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