No serializer found error while serializing List<Object>

Question

I have a class

public class ClassB 
{

    private ClassC c;

    private List<ClasssA> a;

}

which I am returning in my controller method as response body. When I add @JsonIgnore to List object, I am getting response but when I include List, I am getting error as

Could not write content: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: ......

Answer 1

This a common problem with

lazy Hibernate loading: Hibernate won't load the relationships for that particular object instance.

So that's why the error you get. Now the common solution and reported bug is Use this property

@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})

Check more of this Bug Reported and more Lazy vs Eager