JSONObject return empty:false

Question

After some researchs, I didn't have found any solutions to this problem: when I create a JSONObject (org.json) from a file, it return "empty":false. Why does it return this and how can I fix it?

Java:

JSONObject config = new JSONObject(Files.readAllLines(Paths.get("config/maj.json")));

JSON:

{"FyloZ":"0"}

Files.readAllLines is working return the right value.

Thanks!

Roman Puchkovskiy · Accepted Answer · 2017-11-04 19:59:40Z

7

Files.readAllLines() returns List<String>, not a String.

So actually you are using the following constructor (accepting a single Object parameter):

https://stleary.github.io/JSON-java/org/json/JSONObject.html#JSONObject-java.lang.Object-

Construct a JSONObject from an Object using bean getters

The only getter-style method of a List is isEmpty(), so you get that 'empty: false' thing.

Try the following:

String json = new String(Files.readAllBytes(Paths.get("config/maj.json")), "utf-8");
JSONObject config = new JSONObject(json);

Here we read JSON as bytes, convert them to a string (assuming it's in utf-8) and then create a JSONObject from it.

edited Nov 4, 2017 at 19:59

answered Nov 4, 2017 at 19:54

Roman Puchkovskiy

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