Spring Use default TimeZone in RestTemplate

I am setting the timezone of the app as below :

@SpringBootApplication
public class SpringApp extends SpringBootServletInitializer {

    /**
     * Application startup.
     *
     * @param args
     */
    public static void main(final String[] args) {
        SpringApplication.run(SpringApp.class, args);
    }

    /**
     * Setting time zone.
     */
    @PostConstruct
    public void init() {
        // Setting Spring Boot SetTimeZone
        log.info("time zone set to {}", timeZone);
        TimeZone.setDefault(TimeZone.getTimeZone("Europe/London"));
    }
}

But when I am using the restTemplate I had to set the timeZone explicitly like below :

@Configuration
public class AppConfig {

    @Bean
    public RestTemplate restTemplate() {
        RestTemplate restTemplate = new RestTemplate();
        ObjectMapper mapper = new ObjectMapper();

        // Register the Java Time Module
        mapper.registerModule(new JavaTimeModule());

        // Set the default time zone to BST (Europe/London)
        mapper.setTimeZone(TimeZone.getTimeZone("Europe/London"));

        // Configure the RestTemplate to use the customized ObjectMapper
        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter(mapper);
        restTemplate.getMessageConverters().add(0, converter);

        return restTemplate;
    }
}

I was assuming that restTemplate will inherit the app timeZone settings, I think it should? Can you please check and make it possible because it really confusing.

Comment From: snicoll

I am not sure what you're asking us, really. You are configuring the RestTemplate manually so I don't know what you expect us to do. ObjectMapper is not part of Spring, and the default timezone is not set in the Spring context but on the JVM itself.