spring gson

    # pom.xml
    <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-json</artifactId>
        </exclusion>
    </exclusions>
    </dependency>

    // application.java
    @SpringBootApplication(exclude = {JacksonAutoConfiguration.class})
    public class NekoApplication {
    ...

    # pom.xml
    <!-- Gson