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Jersey JSON with Jackson example.

There is a newer version: 4.0.0-M1

/*
 * Copyright (c) 2010, 2022 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package org.glassfish.jersey.examples.jackson;

import jakarta.ws.rs.ext.ContextResolver;
import jakarta.ws.rs.ext.Provider;

import com.fasterxml.jackson.databind.AnnotationIntrospector;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector;
import com.fasterxml.jackson.databind.type.TypeFactory;
import com.fasterxml.jackson.module.jakarta.xmlbind.JakartaXmlBindAnnotationIntrospector;

/**
 * TODO javadoc.
 *
 * @author Jakub Podlesak
 */
@Provider
public class MyObjectMapperProvider implements ContextResolver {

    final ObjectMapper defaultObjectMapper;
    final ObjectMapper combinedObjectMapper;

    public MyObjectMapperProvider() {
        defaultObjectMapper = createDefaultMapper();
        combinedObjectMapper = createCombinedObjectMapper();
    }

    @Override
    public ObjectMapper getContext(final Class type) {

        if (type == CombinedAnnotationBean.class) {
            return combinedObjectMapper;
        } else {
            return defaultObjectMapper;
        }
    }

    private static ObjectMapper createCombinedObjectMapper() {
        return new ObjectMapper()
                .configure(SerializationFeature.WRAP_ROOT_VALUE, true)
                .configure(DeserializationFeature.UNWRAP_ROOT_VALUE, true)
                .setAnnotationIntrospector(createJaxbJacksonAnnotationIntrospector());
    }

    private static ObjectMapper createDefaultMapper() {
        final ObjectMapper result = new ObjectMapper();
        result.enable(SerializationFeature.INDENT_OUTPUT);

        return result;
    }

    private static AnnotationIntrospector createJaxbJacksonAnnotationIntrospector() {

        final AnnotationIntrospector jaxbIntrospector = new JakartaXmlBindAnnotationIntrospector(TypeFactory.defaultInstance());
        final AnnotationIntrospector jacksonIntrospector = new JacksonAnnotationIntrospector();

        return AnnotationIntrospector.pair(jacksonIntrospector, jaxbIntrospector);
    }
}