HHH-19473: Use asDefined type when enhancing BiDirectional Associations to resolve issue with mismatched generated method signatures.

Author: sabbott1877

hibernate-core/src/main/java/org/hibernate/bytecode/enhance/internal/bytebuddy/BiDirectionalAssociationHandler.java

@@ -78,6 +78,7 @@ static Implementation wrap(
 		TypeDescription targetType = FieldLocator.ForClassHierarchy.Factory.INSTANCE.make( targetEntity )
 				.locate( bidirectionalAttributeName )
 				.getField()
+				.asDefined()
 				.getType()
 				.asErasure();
 

hibernate-core/src/test/java/org/hibernate/orm/test/bytecode/enhancement/lazy/LazyLoadingAndParameterizedInheritanceTest.java

@@ -30,6 +30,7 @@
 import java.util.Set;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatNoException;
 
 @DomainModel(
 		annotatedClasses = {
@@ -101,6 +102,14 @@ public void test(SessionFactoryScope scope) {
 		} );
 	}
 
+	@Test
+	public void testCollectionWrite() {
+		Three three = new Three();
+		Two two = new Two();
+		assertThatNoException().isThrownBy(() -> three.setTwos(Set.of(two)));
+		assertThat(two.getThree()).isSameAs(three);
+	}
+
 	@Entity(name = "One")
 	public static class One extends AbsOne<Two> {
 	}