I am using Retrofit2 to call distant web services in a Spring Batch application, and for deserializing JSON responses I would like to configure a global Jackson deserializer via the Jackson2ObjectMapperBuilderCustomizer class.
My configuration is:
I've already tried to define ObjectMapper configuration in a Jackson2ObjectMapperBuilder object and it works, but I still need to specify .addConverter(JacksonConverterFactory.create(<builder>) on each RetrofitBuilder() call:
@Configuration
public class MyRestWSImpl {
@Bean
MyRestWS myRestWS (@Value("${url}") String url) {
return new RetrofitBuilder()
.url(url)
.addConverter(JacksonConverterFactory.create(
new Jackson2ObjectMapperBuilder()
.deserializers(new LocalDateTimeDeserializer(MY_DATE_TIME_FORMATTER))
.build()
)
.client()
.configure()
.build()
.create(MyRestWS.class);
}
}
I'm searching for a better option.
Is there a way in which I can achieve the same result by using the Jackson2ObjectMapperBuilderCustomizer functional interface instead?
I tried to define a bean of type Jackson2ObjectMapperBuilderCustomizer as seen here, but it does not seem to be taken into account by Retrofit2, although the bean is created:
@Configuration
public class JacksonConfig {
@Bean
Jackson2ObjectMapperBuilderCustomizer jsonCustomizer() {
return builder -> builder
.deserializers(new LocalDateTimeDeserializer(MY_DATE_TIME_FORMATTER));
}
}
Console:
DefaultSingletonBeanRegistry : Creating shared instance of singleton bean 'jsonCustomizer'
...
com.fasterxml.jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type `java.time.LocalDateTime` from String "2023-05-26 17:04:52"
If you want to use the customizer, you should inject a Jackson2ObjectMapperBuilder into your bean and use it to build the object mapper.
e.g.
@Bean
SonarqubeClient sonarqubeClient(SonarqubeProperties sonarqubeProperties, Jackson2ObjectMapperBuilder objectMapperBuilder) {
ObjectMapper objectMapper = objectMapperBuilder.build();