Unfortunately I can not use POJOs because the data structure is completely defined by the user.
And a custom map deserializer is unfortunately difficult to implement because the standard MapSerializer is not extendable. Too many private and final methods :-( I'll probably do it now with wrapper objects. However, I will change the whole Map to Map<String,Value> or something like that. The map is anyway only for transport and does not belong to a public API. Then I do not have to do any transformation of the map. Thank you very much for your feedback! Am Freitag, 28. September 2018 07:32:45 UTC+2 schrieb Tatu Saloranta: > > On Thu, Sep 27, 2018 at 10:29 PM Tristan Lins <trista...@gmail.com > <javascript:>> wrote: > >> I need to serialize / deserialize a Map<String, Object> to / from XML >> with dataformat-xml / XmlMapper. >> >> It works fine with JSON when using default typing. >> But when deserialize the XML, the typing of primitive types (especially >> numeric and boolean) get lost. >> >> Every number and boolean is treated as string, when deserializing. >> >> java.lang.AssertionError: expected: java.lang.Integer<123> but was: java. >> lang.String<123> >> >> At the moment I manage with my own module and serializers for the >> primitive types. >> This works fine only with JsonTypeInfo.As.WRAPPER_OBJECT, but with >> JsonTypeInfo.As.WRAPPER_ARRAY, deserialization fails. >> Attached is a unit test and the module. >> >> But I wonder if there is not a better way? >> > > Maps and XML are problematic as XML is inherently text based and has no > mechanism (in base XML specification, not including optional XML Schema > languages and definitions) for differentiating between numbers, strings and > booleans. Or between Arrays and Objects for that matter. > > Couple of approaches you can use to start binding string values are: > > 1. Use of POJOs: Jackson can coerce String values into numbers (etc) > 2. Two-pass processing: first into intermediate structures, then use your > own detection to derive numbers > 3. Custom deserializer for `Map` type. > > -+ Tatu +- > > -- 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.
