Your implementation Does not seem too off , But not sure :/ 2024년 10월 18일 (금) 오후 4:06, [email protected] <[email protected]>님이 작성:
> So @JsonMerge is not appropriate here? > > On Friday, October 18, 2024 at 1:47:07 AM UTC+3 Joo Hyuk Kim wrote: > >> > Jackson should not create any list. >> >> To be more specific, You do not want to create any list and ur looking >> for a such feature. >> >> What we can do here is write a custom deserializer to do such thing and >> there is already plenty references on the web >> >> 2024년 10월 18일 (금) 오전 4:04, [email protected] <[email protected]>님이 작성: >> >>> My class contains an initialized custom collection >>> >>> class MyClass { >>> >>> MyList<Integer> myList = MyList.create(); >>> } >>> >>> where MyList is a j.u.List. When deserializing, I get an exception >>> saying that there is no known deserializer for MyList ("Cannot find a >>> deserializer for non-concrete List type"), which is generally >>> understandable, but I already initialized it, so there's no need for one. >>> Instead, I just want to add the items to the list. >>> To demonstrate, I can add a private setter inside the class: >>> >>> private void setMyList(List<Integer> ints) { ints.forEach(MyList::add); } >>> >>> this works, but I don't think it should be needed. Specifically, Jackson >>> should not create any list. It needs to deserialize the values of the items >>> anyway; then instead of creating a list, add them to the existing one. It's >>> a List, so it should know to call 'add' ('put' for map). >>> >>> I know there is @JsonMerge, and I thought that that's what I needed, but >>> just adding it to the field doesn't work, I still get the same exception. >>> Am I not understanding @JsonMerge or am I doing something wrong? >>> >>> Thanks! >>> >>> -- >>> 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 [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/jackson-user/af74c8b0-1516-4cc8-9117-be6808cf9223n%40googlegroups.com >>> <https://groups.google.com/d/msgid/jackson-user/af74c8b0-1516-4cc8-9117-be6808cf9223n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- > 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 [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/jackson-user/4446a07a-f0b8-4bad-8442-3571d0a328d3n%40googlegroups.com > <https://groups.google.com/d/msgid/jackson-user/4446a07a-f0b8-4bad-8442-3571d0a328d3n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/jackson-user/CALS-ipza9oSmb_-8_Avwh%2Bg%3Dqvtw4BH9%3DD6GFTjL3MCoqukMPQ%40mail.gmail.com.
