Introduce Jackson 3 support for HandlerInstantiator
This commit introduces a org.springframework.http.support.JacksonHandlerInstantiator Jackson 3 variant of org.springframework.http.converter.json.SpringHandlerInstantiator Jackson 2 class. See gh-33798
This commit is contained in:
Sébastien Deleuze
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/*
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* Copyright 2002-2025 the original author or authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.springframework.http.support;
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import java.util.Collection;
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import java.util.HashMap;
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import java.util.Map;
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import com.fasterxml.jackson.annotation.JsonTypeInfo;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.Test;
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import tools.jackson.core.JsonGenerator;
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import tools.jackson.core.JsonParser;
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import tools.jackson.databind.DatabindContext;
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import tools.jackson.databind.DeserializationContext;
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import tools.jackson.databind.JavaType;
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import tools.jackson.databind.JsonNode;
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import tools.jackson.databind.KeyDeserializer;
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import tools.jackson.databind.ObjectMapper;
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import tools.jackson.databind.SerializationContext;
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import tools.jackson.databind.ValueDeserializer;
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import tools.jackson.databind.ValueSerializer;
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import tools.jackson.databind.annotation.JsonDeserialize;
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import tools.jackson.databind.annotation.JsonSerialize;
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import tools.jackson.databind.annotation.JsonTypeIdResolver;
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import tools.jackson.databind.annotation.JsonTypeResolver;
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import tools.jackson.databind.json.JsonMapper;
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import tools.jackson.databind.jsontype.NamedType;
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import tools.jackson.databind.jsontype.TypeDeserializer;
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import tools.jackson.databind.jsontype.TypeIdResolver;
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import tools.jackson.databind.jsontype.TypeSerializer;
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import tools.jackson.databind.jsontype.impl.StdTypeResolverBuilder;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor;
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import org.springframework.beans.factory.support.DefaultListableBeanFactory;
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import org.springframework.beans.factory.support.RootBeanDefinition;
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import static org.assertj.core.api.Assertions.assertThat;
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/**
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* Test class for {@link JacksonHandlerInstantiator}.
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*
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* @author Sebastien Deleuze
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*/
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class JacksonHandlerInstantiatorTests {
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private JacksonHandlerInstantiator instantiator;
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private ObjectMapper objectMapper;
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@BeforeEach
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void setup() {
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DefaultListableBeanFactory bf = new DefaultListableBeanFactory();
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AutowiredAnnotationBeanPostProcessor bpp = new AutowiredAnnotationBeanPostProcessor();
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bpp.setBeanFactory(bf);
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bf.addBeanPostProcessor(bpp);
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bf.registerBeanDefinition("capitalizer", new RootBeanDefinition(Capitalizer.class));
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instantiator = new JacksonHandlerInstantiator(bf);
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objectMapper = JsonMapper.builder().handlerInstantiator(instantiator).build();
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}
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@Test
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void autowiredSerializer() {
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User user = new User("bob");
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String json = this.objectMapper.writeValueAsString(user);
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assertThat(json).isEqualTo("{\"username\":\"BOB\"}");
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}
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@Test
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void autowiredDeserializer() {
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String json = "{\"username\":\"bob\"}";
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User user = this.objectMapper.readValue(json, User.class);
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assertThat(user.getUsername()).isEqualTo("BOB");
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}
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@Test
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void autowiredKeyDeserializer() {
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String json = "{\"credentials\":{\"bob\":\"admin\"}}";
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SecurityRegistry registry = this.objectMapper.readValue(json, SecurityRegistry.class);
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assertThat(registry.getCredentials()).containsKey("BOB");
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assertThat(registry.getCredentials()).doesNotContainKey("bob");
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}
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@Test
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void applicationContextAwaretypeResolverBuilder() {
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this.objectMapper.writeValueAsString(new Group());
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assertThat(CustomTypeResolverBuilder.isAutowiredFiledInitialized).isTrue();
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}
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@Test
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void applicationContextAwareTypeIdResolver() {
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this.objectMapper.writeValueAsString(new Group());
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assertThat(CustomTypeIdResolver.isAutowiredFiledInitialized).isTrue();
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}
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public static class UserDeserializer extends ValueDeserializer<User> {
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@Autowired
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private Capitalizer capitalizer;
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@Override
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public User deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) {
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JsonNode node = jsonParser.readValueAsTree();
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return new User(this.capitalizer.capitalize(node.get("username").asString()));
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}
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}
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public static class UserSerializer extends ValueSerializer<User> {
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@Autowired
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private Capitalizer capitalizer;
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@Override
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public void serialize(User user, JsonGenerator jsonGenerator, SerializationContext serializationContext) {
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jsonGenerator.writeStartObject();
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jsonGenerator.writeStringProperty("username", this.capitalizer.capitalize(user.getUsername()));
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jsonGenerator.writeEndObject();
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}
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}
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public static class UpperCaseKeyDeserializer extends KeyDeserializer {
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@Autowired
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private Capitalizer capitalizer;
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@Override
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public Object deserializeKey(String key, DeserializationContext context) {
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return this.capitalizer.capitalize(key);
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}
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}
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public static class CustomTypeResolverBuilder extends StdTypeResolverBuilder {
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@Autowired
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private Capitalizer capitalizer;
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public static boolean isAutowiredFiledInitialized = false;
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@Override
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public TypeSerializer buildTypeSerializer(SerializationContext serializationContext, JavaType baseType,
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Collection<NamedType> subtypes) {
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isAutowiredFiledInitialized = (this.capitalizer != null);
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return super.buildTypeSerializer(serializationContext, baseType, subtypes);
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}
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@Override
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public TypeDeserializer buildTypeDeserializer(DeserializationContext deserializationContext,
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JavaType baseType, Collection<NamedType> subtypes) {
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return super.buildTypeDeserializer(deserializationContext, baseType, subtypes);
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}
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}
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public static class CustomTypeIdResolver implements TypeIdResolver {
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@Autowired
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private Capitalizer capitalizer;
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public static boolean isAutowiredFiledInitialized = false;
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public CustomTypeIdResolver() {
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}
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@Override
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public String idFromValueAndType(DatabindContext ctxt, Object o, Class<?> type) {
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return type.getClass().getName();
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}
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@Override
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public JsonTypeInfo.Id getMechanism() {
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return JsonTypeInfo.Id.CUSTOM;
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}
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@Override
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public String idFromValue(DatabindContext databindContext, Object value) {
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isAutowiredFiledInitialized = (this.capitalizer != null);
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return value.getClass().getName();
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}
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@Override
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public void init(JavaType type) {
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}
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@Override
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public String idFromBaseType(DatabindContext ctxt) {
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return null;
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}
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@Override
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public JavaType typeFromId(DatabindContext context, String id) {
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return null;
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}
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@Override
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public String getDescForKnownTypeIds() {
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return null;
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}
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}
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@JsonDeserialize(using = UserDeserializer.class)
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@JsonSerialize(using = UserSerializer.class)
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public static class User {
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private String username;
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public User() {
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}
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public User(String username) {
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this.username = username;
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}
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public String getUsername() { return this.username; }
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}
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public static class SecurityRegistry {
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@JsonDeserialize(keyUsing = UpperCaseKeyDeserializer.class)
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private Map<String, String> credentials = new HashMap<>();
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public void addCredential(String username, String credential) {
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this.credentials.put(username, credential);
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}
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public Map<String, String> getCredentials() {
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return credentials;
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}
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}
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@JsonTypeInfo(use = JsonTypeInfo.Id.CUSTOM, property = "type")
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@JsonTypeResolver(CustomTypeResolverBuilder.class)
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@JsonTypeIdResolver(CustomTypeIdResolver.class)
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public static class Group {
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public String getType() {
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return Group.class.getName();
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}
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}
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public static class Capitalizer {
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public String capitalize(String text) {
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return text.toUpperCase();
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}
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}
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}
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