Consistently detect wildcard without bounds as unresolvable

Closes gh-32327
See gh-20727

Author: jhoeller

spring-core/src/main/java/org/springframework/core/ResolvableType.java

@@ -325,7 +325,7 @@ private boolean isAssignableFrom(ResolvableType other, boolean strict,
 					other.getComponentType(), true, matchedBefore, upUntilUnresolvable));
 		}
 
-		if (upUntilUnresolvable && other.isUnresolvableTypeVariable()) {
+		if (upUntilUnresolvable && (other.isUnresolvableTypeVariable() || other.isWildcardWithoutBounds())) {
 			return true;
 		}
 

spring-core/src/test/java/org/springframework/core/ResolvableTypeTests.java

@@ -1367,6 +1367,18 @@ void spr16456() throws Exception {
 		assertThat(type.resolveGeneric()).isEqualTo(Integer.class);
 	}
 
+	@Test
+	void gh32327() throws Exception {
+		ResolvableType repository1 = ResolvableType.forField(Fields.class.getField("repository"));
+		ResolvableType repository2 = ResolvableType.forMethodReturnType(Methods.class.getMethod("repository"));
+		assertThat(repository1.hasUnresolvableGenerics());
+		assertThat(repository1.isAssignableFrom(repository2)).isFalse();
+		assertThat(repository1.isAssignableFromResolvedPart(repository2)).isTrue();
+		assertThat(repository2.hasUnresolvableGenerics());
+		assertThat(repository2.isAssignableFrom(repository1)).isTrue();
+		assertThat(repository2.isAssignableFromResolvedPart(repository1)).isTrue();
+	}
+
 
 	private ResolvableType testSerialization(ResolvableType type) throws Exception {
 		ByteArrayOutputStream bos = new ByteArrayOutputStream();
@@ -1407,7 +1419,7 @@ static class ExtendsMap extends HashMap<String, Integer> {
 	}
 
 
-	interface SomeRepository {
+	interface SomeRepository<S extends Serializable> {
 
 		<T> T someMethod(Class<T> arg0, Class<?> arg1, Class<Object> arg2);
 	}
@@ -1458,6 +1470,8 @@ static class Fields<T> {
 		public Integer[] integerArray;
 
 		public int[] intArray;
+
+		public SomeRepository<? extends Serializable> repository;
 	}
 
 
@@ -1486,6 +1500,8 @@ interface Methods<T> {
 		List<String> list1();
 
 		List<String> list2();
+
+		SomeRepository<?> repository();
 	}