Hello everyone! I have a problem with serialization via Jackson. When i do JsonNode smth = readValueToTree(obj) I get information about class type (e.g. java.Math.BigInteger, java.lang.ArrayList). This problem pop up for entities contains Map<String, Object> without any serializer. Also in entity which is not full filled. E.g. I have class ContactMethod which contains several fields. If all information is present then problem goes away. But if filled only one field with id (type bigInteger) then i catch class type info: Expected:
"contactMethods": [ "@type": "PhoneNumber", "id": "9148293419813662646", Actual: "contactMethods": ["java.util.ArrayList", "@type": "PhoneNumber", "id": "9148293419813662646" Another example (with map serialization): My class have chars (Map<String, Object>). Expected, that when I'll serialize it I'll get: "chars": { "char": [ 1 ] }, but actual I get: "chars": {"char": ["java.math.BigInteger", 1]} Anyone knows why it happens? Thanks I got the answer like: >From symptoms it looks like you have enabled "default typing" (there are multiple methods in ObjectMapper to do that), which forces inclusion of type information similar to what happens when you use @JsonTypeInfo annotation. You will want to disable this setting, or use explicit @JsonTypeInfo(use = Id.NONE) to disable polymorphic handling for specific field(s). But, I have enabled "default typing" and @jsontypeinfo(use = Id.CLASS), I need it in the other reasons. This problem appears strangely: [image: problem] Birthday and contactMethods are located under contacts. But if contactMethods is located in the first level like contacts - all is ok [image: problem2] -- You received this message because you are subscribed to the Google Groups "jackson-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to jackson-user+unsubscr...@googlegroups.com. To post to this group, send email to jackson-user@googlegroups.com. For more options, visit https://groups.google.com/d/optout.