NullPointerException when trying to read a double from a json file

Question

I am trying to read a json file, and from it, a double, but I came across NullPointerException in the following situation, while there is no apparent error in it.

double longitude = (double) json_restaurant.get("longitude");

error:

java.lang.NullPointerException

I tried to check if it wasn't working, by calling System.out.println(longitude) after the above-mentioned code snippet, and the terminal does display the correct value of longitude.

Where am I going wrong, if anywhere?

Consider editing this question, it does not read very clearly. — Thomas Smyth - Treliant, Dec 01 '17 at 23:41
`I tried to check if it wasn't working, by calling System.out.println(longitude) after the above-mentioned code snippet,` - well that would imply the error is not thrown in that line of code if it runs past it? — Mark, Dec 02 '17 at 00:04

score 0 · Answer 1 · answered Dec 02 '17 at 00:12

0

Check the JSON. Does it have the longitude? If it does not get("longitude") might return null. It is something that you can not assign to primitive double. That will throw NPE.

Try using Double instead

answered Dec 02 '17 at 00:12

pirho

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NullPointerException when trying to read a double from a json file

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