GenericTypeResolver returns Object for parameterized parameters [SPR-7389]

[spring-projects-issues]

Oliver Drotbohm opened SPR-7389 and commented

Suppose you have a generic type MyType<T> and a concrete type based on that types T to a parameterized type again MyConcreteType extends MyType<Collection<String>>. Using GenericTypeResolver.resolveTypeArguments(MyConcreteType.class, MyType.class) returns Object as resolved type where Collection would be expected.

I dived into the sources and it seems extractClass(Class ownerClass, Type arg) misses a check for Type being an instance of ParameterizedType. In this case it could simply return ((ParameterizedType) type).getRawType(). Currently it simply returns Object.

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Affects: 3.0.3

Issue Links:

• SimpleApplicationEventMulticaster does not filter ApplicationEvents correctly [SPR-5974] #10642 SimpleApplicationEventMulticaster does not filter ApplicationEvents correctly

Referenced from: commits b7b7c06

[spring-projects-issues]

Juergen Hoeller commented

Good catch! In addition, this didn't work for generic superclasses at all - just for generic interfaces. I've fixed both issues for 3.0.4 now.

Juergen