java - Spring Boot 1.4 Customize Internal Jackson Deserialization

Question

I am using spring.jackson.deserialization.FAIL_ON_UNKNOWN_PROPERTIES=true in the application.properties to make deserialization fail on unknown properties but its not working.

I even tried using :

@Bean
ObjectMapper objectMapper() {
  return Jackson2ObjectMapperBuilder
        .json()
        .featuresToEnable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
        .build();
}

But this also didn't work. What am I missing?

Answer 1

With Spring boot, by default, unknown properties are ignored during deserialization. In order not to ignore these properties, you can :

• Add spring.jackson.deserialization.FAIL_ON_UNKNOWN_PROPERTIES=true in the application.properties

• Use this bean :

  @Bean
  public ObjectMapper objectMapper() {
      return Jackson2ObjectMapperBuilder
      .json()
      .featuresToEnable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
      .build();
  }
  

• Use this bean :

  @Bean 
  public Jackson2ObjectMapperBuilder objectMapperBuilder(){
      Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
      builder.failOnUnknownProperties(true);
      return builder;
  }
  

I have tested these solutions and it works so there is another problem in your code. Please, can you post your code as ask by javaguy?