How-to articles, tricks, and solutions about SPRING
The "failed to lazily initialize a collection of role" exception in Hibernate is thrown when you try to access an uninitialized collection from a Hibernate entity when the entity is in a detached state.
If IntelliJ is saying "No beans of type 'X' found for autowiring" for a repository that you are trying to autowire, it means that the Spring application context does not contain a bean of the specified type.
If you want to use the @JsonIgnore annotation to ignore a field during serialization but not during deserialization, you can use the @JsonIgnoreProperties annotation and set its writeOnly property to true.
To make a POST request with the RestTemplate in JSON, you can use the postForObject() method and pass it the URL of the request, the request body, the response type, and the HttpEntity object that represents the request headers and body.