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I am trying to figure out how oneOf works by building a schema which validates two different object types. For example a person (firstname, lastname, sport) and vehicles (type, cost).

Here are some sample objects:

{"firstName":"John", "lastName":"Doe", "sport": "football"}
{"vehicle":"car", "price":20000}
The question is what have I done wrongly and how can I fix it. Here is the schema:
    "description": "schema validating people and vehicles", 
    "$schema": "http://json-schema.org/draft-04/schema#",
    "type": "object",
    "required": [ "oneOf" ],
    "properties": { "oneOf": [
            "firstName": {"type": "string"}, 
            "lastName": {"type": "string"}, 
            "sport": {"type": "string"}
            "vehicle": {"type": "string"}, 
            "price":{"type": "integer"} 
When I try to validate it in this parser:
https://json-schema-validator.herokuapp.com/
I get the following error:
  "level" : "fatal",
  "message" : "invalid JSON Schema, cannot continue\nSyntax errors:\n[ {\n  \"level\" : \"error\",\n  \"schema\" : {\n    \"loadingURI\" : \"#\",\n    \"pointer\" : \"/properties/oneOf\"\n  },\n  \"domain\" : \"syntax\",\n  \"message\" : \"JSON value is of type array, not a JSON Schema (expected an object)\",\n  \"found\" : \"array\"\n} ]",
  "info" : "other messages follow (if any)"
  "level" : "error",
  "schema" : {
    "loadingURI" : "#",
    "pointer" : "/properties/oneOf"
  "domain" : "syntax",
  "message" : "JSON value is of type array, not a JSON Schema (expected an object)",
  "found" : "array"
                Does oneOf help in validating the request? I can't see any jackson annotation for oneOf during pojo conversion
– gursahib.singh.sahni
                May 3, 2017 at 8:50
                @gursahib.singh.sahni, that is a jackson specific problem. It is not easy to translate oneOf semantics to some programming languages such as java. You need some construct like Disjoint sets, Discriminated Unions, Union Types... that other languages have.
– jruizaranguren
                May 3, 2017 at 9:47
                @jruizaranguren there any library other than jackson that handles this case ? or else we would have to add custom validators in our codebase.
– gursahib.singh.sahni
                May 3, 2017 at 9:50
                @AlirezaMirian, if you do not explicitly specify it, any other type would satisfy the specification, because "oneOf" only applies to types.  It is ignored for other types.
– jruizaranguren
                Dec 29, 2017 at 14:52
                Well it makes sense from deduction of what properties does, i.e. why would properties ever make a special case for keys named oneOf? Pretty much common sense it works this way now that I think of it. Thanks for the explanation.
– davidtgq
                Oct 19, 2017 at 0:17
        
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