GenericTypeResolver does not resolve the correct parameter type when bound type is also ParameterizedType [SPR-10819]

[spring-projects-issues]

Teddy Zhu opened SPR-10819 and commented

Follow is test code snap.

import org.springframework.core.GenericTypeResolver;

public class TestGeneric {

public static void main(String[] args) {
	Class[] types = GenericTypeResolver.resolveTypeArguments(Test.class, ITest.class);
	for (Class klass : types) {
		
		System.out.println(klass);//Issue: suppose should print B at least, but it print Object
	}
}

}

class A{}

class B<T>{}

class ITest<T>{}

class Test<I extends A, T extends B<I>> extends ITest<T>{

}

---

Affects: 3.1.3

[spring-projects-issues]

Teddy Zhu commented

It should print B at least if we don't know the concrete type , but it print Object.
But if I change the
class Test<I extends A, T extends B<I>> extends ITest<T>{
}
to
class Test<I extends A, T extends B> extends ITest<T>{
}
then, the test will print the B. It cause some issue when I use spring-data-mongodb.

[spring-projects-issues]

Juergen Hoeller commented

Good catch! Fixed for 4.0 RC1 now, and backported to 3.2.5.

Juergen