It will match 2 schemas if the field is null when $ref definitions schema

[ke-liang]

Hello,
I use the rest-assured and encounter the issue about json-schema-validator, could you please help me resolve this issue below?

1. define a definitionsSchema.json like below
   { "$schema": "http://json-schema.org/draft-04/schema#", "title": "BasicChargeAndOrderSchema", "description": "定义一些用于校验 charge/order 的基本 schema", "balanceBonus": { "properties": { "id": { "type": "string", "pattern": "^65[0-9]{22}$" } } }, "recharge": { "properties": { "balance_bonus": { "oneOf": [ { "type": "object", "$ref": "#/balanceBonus" }, { "type": "null" } ] } } } }
   2.define rechargeCreateSchema.json that will be used to validate the json file
   { "$schema": "http://json-schema.org/draft-04/schema#", "title": "Recharge创建", "description": "此 schema 用于校验 recharge 的创建", "type": "object", "allOf": [ { "$ref": "definitionsSchema.json#/recharge" } ] }
   3.validator the json below
   { "balance_bonus": null }
   Actual Result: failed! because it ["matched":2,"nrSchemas":2]

Response body doesn't match expectation.
Expected: The content to match the given JSON schema.
error: instance failed to match all required schemas (matched only 0 out of 1)
level: "error"
schema: {"loadingURI":"file:/schemas/rechargeCreateSchema.json#","pointer":""}
instance: {"pointer":""}
domain: "validation"
keyword: "allOf"
matched: 0
nrSchemas: 1
reports: {"/allOf/0":[{"level":"error","schema":{"loadingURI":"file://schemas/definitionsSchema.json#","pointer":"/recharge/properties/balance_bonus"},"instance":{"pointer":"/balance_bonus"},"domain":"validation","keyword":"oneOf","message":"instance failed to match exactly one schema (matched 2 out of 2)","matched":2,"nrSchemas":2,"reports":{"/recharge/properties/balance_bonus/oneOf/0":[],"/recharge/properties/balance_bonus/oneOf/1":[]}}]}

Other info:
If the "balance_bonus" is not null, that's ok!