Resolve target type of wrapped one in custom StdTypeResolverBuilder.

This commit makes sure to avoid typing of primitive wrapper types wrapped inside what is considered a jackson ReferenceType (such as Optional, AtomicReference,...).

Original Pull Request: #2364

Author: christophstrobl

src/main/java/org/springframework/data/redis/serializer/GenericJackson2JsonRedisSerializer.java

@@ -349,21 +349,33 @@ public boolean useForType(JavaType t) {
 				return true;
 			}
 
-			while (t.isArrayType()) {
-				t = t.getContentType();
-			}
+			t = resolveArrayOrWrapper(t);
 
 			if (ClassUtils.isPrimitiveOrWrapper(t.getRawClass())) {
 				return false;
 			}
 
-			// 19-Apr-2016, tatu: ReferenceType like Optional also requires similar handling:
-			while (t.isReferenceType()) {
-				t = t.getReferencedType();
-			}
-
 			// [databind#88] Should not apply to JSON tree models:
 			return !TreeNode.class.isAssignableFrom(t.getRawClass());
 		}
+
+		private JavaType resolveArrayOrWrapper(JavaType type) {
+
+			while (type.isArrayType()) {
+				type = type.getContentType();
+				if (type.isReferenceType()) {
+					type = resolveArrayOrWrapper(type);
+				}
+			}
+
+			while (type.isReferenceType()) {
+				type = type.getReferencedType();
+				if (type.isArrayType()) {
+					type = resolveArrayOrWrapper(type);
+				}
+			}
+
+			return type;
+		}
 	}
 }

src/test/java/org/springframework/data/redis/serializer/GenericJackson2JsonRedisSerializerUnitTests.java

@@ -24,6 +24,7 @@
 import lombok.ToString;
 
 import java.io.IOException;
+import java.util.concurrent.atomic.AtomicReference;
 import java.util.Map;
 
 import org.junit.jupiter.api.Test;
@@ -171,7 +172,7 @@ void deserializeShouldBeAbleToRestoreFinalObjectAfterSerialization() {
 	}
 
 	@Test // GH-2361
-	void shouldDeserializeArrayWithoutTypeHint() {
+	void shouldDeserializePrimitiveArrayWithoutTypeHint() {
 
 		GenericJackson2JsonRedisSerializer gs = new GenericJackson2JsonRedisSerializer();
 		CountAndArray result = (CountAndArray) gs.deserialize(
@@ -262,6 +263,87 @@ void shouldConsiderReader() {
 		});
 	}
 
+	@Test // GH-2361
+	void shouldDeserializePrimitiveWrapperArrayWithoutTypeHint() {
+
+		GenericJackson2JsonRedisSerializer gs = new GenericJackson2JsonRedisSerializer();
+		CountAndArray result = (CountAndArray) gs.deserialize(
+				("{\"@class\":\"org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializerUnitTests$CountAndArray\", \"count\":1, \"arrayOfPrimitiveWrapper\":[0,1]}")
+						.getBytes());
+
+		assertThat(result.getCount()).isEqualTo(1);
+		assertThat(result.getArrayOfPrimitiveWrapper()).containsExactly(0L, 1L);
+	}
+
+	@Test // GH-2361
+	void doesNotIncludeTypingForPrimitiveArrayWrappers() {
+
+		GenericJackson2JsonRedisSerializer serializer = new GenericJackson2JsonRedisSerializer();
+
+		WithWrapperTypes source = new WithWrapperTypes();
+		source.primitiveWrapper = new AtomicReference<>();
+		source.primitiveArrayWrapper = new AtomicReference<>(new Integer[] { 200, 300 });
+		source.simpleObjectWrapper = new AtomicReference<>();
+
+		byte[] serializedValue = serializer.serialize(source);
+
+		assertThat(new String(serializedValue)) //
+				.contains("\"primitiveArrayWrapper\":[200,300]") //
+				.doesNotContain("\"[Ljava.lang.Integer;\"");
+
+		assertThat(serializer.deserialize(serializedValue)) //
+				.isInstanceOf(WithWrapperTypes.class) //
+				.satisfies(it -> {
+					WithWrapperTypes deserialized = (WithWrapperTypes) it;
+					assertThat(deserialized.primitiveArrayWrapper).hasValue(source.primitiveArrayWrapper.get());
+				});
+	}
+
+	@Test // GH-2361
+	void doesNotIncludeTypingForPrimitiveWrappers() {
+
+		GenericJackson2JsonRedisSerializer serializer = new GenericJackson2JsonRedisSerializer();
+
+		WithWrapperTypes source = new WithWrapperTypes();
+		source.primitiveWrapper = new AtomicReference<>(123L);
+
+		byte[] serializedValue = serializer.serialize(source);
+
+		assertThat(new String(serializedValue)) //
+				.contains("\"primitiveWrapper\":123") //
+				.doesNotContain("\"Ljava.lang.Long;\"");
+
+		assertThat(serializer.deserialize(serializedValue)) //
+				.isInstanceOf(WithWrapperTypes.class) //
+				.satisfies(it -> {
+					WithWrapperTypes deserialized = (WithWrapperTypes) it;
+					assertThat(deserialized.primitiveWrapper).hasValue(source.primitiveWrapper.get());
+				});
+	}
+
+	@Test // GH-2361
+	void includesTypingForWrappedObjectTypes() {
+
+		GenericJackson2JsonRedisSerializer serializer = new GenericJackson2JsonRedisSerializer();
+
+		SimpleObject simpleObject = new SimpleObject(100L);
+		WithWrapperTypes source = new WithWrapperTypes();
+		source.simpleObjectWrapper = new AtomicReference<>(simpleObject);
+
+		byte[] serializedValue = serializer.serialize(source);
+
+		assertThat(new String(serializedValue)) //
+				.contains(
+						"\"simpleObjectWrapper\":{\"@class\":\"org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializerUnitTests$SimpleObject\",\"longValue\":100}");
+
+		assertThat(serializer.deserialize(serializedValue)) //
+				.isInstanceOf(WithWrapperTypes.class) //
+				.satisfies(it -> {
+					WithWrapperTypes deserialized = (WithWrapperTypes) it;
+					assertThat(deserialized.simpleObjectWrapper).hasValue(source.simpleObjectWrapper.get());
+				});
+	}
+
 	private static void serializeAndDeserializeNullValue(GenericJackson2JsonRedisSerializer serializer) {
 
 		NullValue nv = BeanUtils.instantiateClass(NullValue.class);
@@ -311,7 +393,6 @@ public boolean equals(Object obj) {
 			return nullSafeEquals(this.stringValue, other.stringValue)
 					&& nullSafeEquals(this.simpleObject, other.simpleObject);
 		}
-
 	}
 
 	@Data
@@ -373,5 +454,14 @@ static class CountAndArray {
 
 		private int count;
 		private int[] available;
+		private Long[] arrayOfPrimitiveWrapper;
+	}
+
+	@Data
+	static class WithWrapperTypes {
+
+		AtomicReference<Long> primitiveWrapper;
+		AtomicReference<Integer[]> primitiveArrayWrapper;
+		AtomicReference<SimpleObject> simpleObjectWrapper;
 	}
 }