Skip serialization of potentially non-serializable cached state

Closes gh-36346

Author: jhoeller

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

@@ -123,13 +123,13 @@ public class ResolvableType implements Serializable {
 
 	private @Nullable Class<?> resolved;
 
-	private volatile @Nullable ResolvableType superType;
+	private transient volatile @Nullable ResolvableType superType;
 
-	private volatile ResolvableType @Nullable [] interfaces;
+	private transient volatile ResolvableType @Nullable [] interfaces;
 
-	private volatile ResolvableType @Nullable [] generics;
+	private transient volatile ResolvableType @Nullable [] generics;
 
-	private volatile @Nullable Boolean unresolvableGenerics;
+	private transient volatile @Nullable Boolean unresolvableGenerics;
 
 
 	/**

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

@@ -1335,6 +1335,22 @@ void serialize() throws Exception {
 		assertThat(deserializedNone).isSameAs(ResolvableType.NONE);
 	}
 
+	@Test
+	void serializeWithCachedState() throws Exception {
+		ResolvableType type = ResolvableType.forClass(List.class);
+		testSerialization(type);
+		type.getSuperType();
+		type.getInterfaces();
+		type.getGenerics();
+		type.hasUnresolvableGenerics();
+		testSerialization(type);
+		type.getSuperType();
+		type.getInterfaces();
+		type.getGenerics();
+		type.hasUnresolvableGenerics();
+		testSerialization(type);
+	}
+
 	@Test
 	void canResolveVoid() {
 		ResolvableType type = ResolvableType.forClass(void.class);