CODEWITHSUNDEEP
javajsonjacksonjsonpath
Indark
Indark

Reputation: 344

Jackson JSON & Jayway JSON Path

I have a json string as below

    {
     "haserrors": 
                 {
                   "errornumber": "400",
                   "errors": [
                               {
                                 "nameofbusiness-error-1": "nameofbusiness must have a length greater than 1",
                                 "nameofbusiness-error-2": "legalname must have a length greater than 1",
                                 "nameofbusiness-error-3": "postaladdress must have a length greater than 1",
                                 "nameofbusiness-error-4": "city must have a length greater than 1",
                                 "nameofbusiness-error-5": "state must have a length greater than 1",
                                 "nameofbusiness-error-6": "pincode must have a length greater than 6, pincode must be numeric, pincode must be positive",
                                 "nameofbusiness-error-7": "fewwords must have a length greater than 1",
                                 "nameofbusiness-error-8": "lob must have a length greater than 1",
                                 "nameofbusiness-error-9": "step must be numeric, step must be positive"
                              }
                            ]
                }
    }

I need to extract all nodes and values under "errors". This is my current piece of code

    Configuration conf = Configuration.builder().jsonProvider(new JacksonJsonNodeJsonProvider())
            .options(Option.ALWAYS_RETURN_LIST, Option.SUPPRESS_EXCEPTIONS).build();
    ArrayNode jsonErrorMessageNodes = JsonPath.using(conf).parse(<<JSON STRING ABOVE>>).read("$..errors");

  for (Iterator<JsonNode> it = jsonErrorMessageNodes.elements() ; it.hasNext() ; ) {
            JsonNode node = it.next();
            String s = node.toString();
            System.out.println(node);
        }

How do I get the node name?

Upvotes: 0

Views: 2953

Answers (1)

glytching
glytching

Reputation: 47895

The following code ...

Configuration conf = Configuration.builder().jsonProvider(new JacksonJsonNodeJsonProvider())
        .options(Option.ALWAYS_RETURN_LIST, Option.SUPPRESS_EXCEPTIONS).build();
ArrayNode jsonErrorMessageNodes = JsonPath.using(conf).parse(json).read("$..errors[*]");

for (Iterator<JsonNode> it = jsonErrorMessageNodes.elements() ; it.hasNext() ; ) {
    JsonNode node = it.next();
    for (Iterator<String> it1 = node.fieldNames(); it1.hasNext(); ) {
        final String s = it1.next();
        System.out.println(s);
    }
}

... will print out:

nameofbusiness-error-1
nameofbusiness-error-2
nameofbusiness-error-3
nameofbusiness-error-4
nameofbusiness-error-5
nameofbusiness-error-6
nameofbusiness-error-7
nameofbusiness-error-8
nameofbusiness-error-9

The key difference between this and the code you posted is the JsonPath expression. You were using: $..errors which produces something like:

[
   null,
   [
      {...}
   ],
   null
]

So, there's more than one node to walk through in order to find the one of interest to you, By contrast, this expression: returns only the errors array e.g.

[
   {...}
]

Upvotes: 1

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