required with empty array causes validation failure

[BrunoBonacci]

using: json-schema-validator "2.2.6"

with this schema

{
  "type": "object",
  "properties": {
    "hello": { "type": "string" }
  },
  "required": []
}

I'm getting the following error:

[ {
  "level" : "fatal",
  "message" : "invalid JSON Schema, cannot continue\nSyntax errors:\n[ {\n  \"level\" : \"error\",\n  \"message\" : \"array must have at least one element\",\n  \"domain\" : \"syntax\",\n  \"schema\" : {\n    \"loadingURI\" : \"#\",\n    \"pointer\" : \"\"\n  },\n  \"keyword\" : \"required\"\n} ]",
  "info" : "other messages follow (if any)"
}, {
  "level" : "error",
  "message" : "array must have at least one element",
  "domain" : "syntax",
  "schema" : {
    "loadingURI" : "#",
    "pointer" : ""
  },
  "keyword" : "required"
} ]

in which it seems to consider invalid "required": [] while the specifications seems to suggest that this is a valid combination:
http://json-schema.org/latest/json-schema-validation.html#rfc.section.6.17

Omitting this keyword has the same behavior as an empty array.

[huggsboson]

My guess is that this changed in newer drafts, you can see in the change log:

Allow empty "required" and "dependencies" arrays

I'd hesitate to adjust this for clients with Draft4 conformance, but I'd love to support newer versions of json-schema draft and am happy to accept PR's.

[LukeDefeo]

yes this is the correct behaviour for v4

[huggsboson]

would love to get a pull request for v5 (and give the author push/owner access to the project).

[yongnote]

hi, this will be OK
{
"type": "object",
"properties": {
"hello": { "type": "string" }
}
}

[thedevd]

I am stuck in this same issue, not able to get through this.