Getting a strange NullPointerException

Question

Not sure why i get this, here is the exception:

Exception in thread "main" java.lang.NullPointerException
at org.dementhium.model.definition.ItemDefinition.loadMiscData(ItemDefinition.java:126)
at org.dementhium.model.definition.ItemDefinition.init(ItemDefinition.java:104)
at org.dementhium.model.World.load(World.java:127)
at org.dementhium.RS2ServerBootstrap.main(RS2ServerBootstrap.java:43)

here is my loadmiscdata method:

    private static void loadMiscData() throws IOException {
    BufferedReader reader = new BufferedReader(new FileReader("data/item/poisoningitems.txt"));
    String string;
    while ((string = reader.readLine()) != null) {
        String[] data = string.split(":");
        int id = Integer.parseInt(data[0]);
        int amount = Integer.parseInt(data[1]);
        definitions[id].setPoisonAmount(amount);
    }
    reader = new BufferedReader(new FileReader("data/item/equipIds.txt"));
    while ((string = reader.readLine()) != null) {
        String[] data = string.split(":");
        int id = Integer.parseInt(data[0]);
        int equipId = Integer.parseInt(data[1]);
        definitions[id].setEquipId(equipId);
    }
}

line 126:

            definitions[id].setEquipId(equipId);

here is part of my equipids file(wont post all because its huge):

I have no idea why i am getting this exception...

Thanks in advance :)

Sorry i forgot to post definitions here it is:

private static ItemDefinition[] definitions;
definitions = new ItemDefinition[MAX_SIZE];

MAX_SIZE = 20792 btw

for the entire class look here: http://pastebin.com/rvyMp42q

Thanks again

Either `definitions` is null or `definitions[id]` is null. Step through your code with a debugger to figure it out. — Matt Ball, Nov 29 '13 at 16:57
I'd guess either of `definitions[id]` or `equipId` is `null`. For 'better than guesses', post an [SSCCE](http://sscce.org/). — Andrew Thompson, Nov 29 '13 at 16:57
Neither `id` nor `equipId` can be null since they're primitives (and if the data was null there should be a NumberFormatException), so I'd say it's `definitions` or `definitions[id]`. — Thomas, Nov 29 '13 at 16:59
Set an exception breakpoint in your debugger and ye shall find the answer you seek. — biziclop, Nov 29 '13 at 16:59
Did you actually give the array indices values? You showed the declaration, please show where you're giving the array actual `ItemDefinition` value. You need to create a `new ItemDefinition` for each index. Did you do that? — Paul Samsotha, Nov 29 '13 at 17:09
what is value of length after `int length = buffer.getShort();` — user902383, Nov 29 '13 at 17:10
I added definition and i ran debugger, it says 20763:5191 broken doesn't tell me why though... — user2997839, Nov 29 '13 at 17:11

score 0 · Answer 1 · answered Nov 29 '13 at 17:35

The Array is initialized, but the ItemDefinition at position 'id' is not initialized. It is null as of now, hence calling a setter function on it is causing a null pointer.

Try creating a new ItemDefinition

    ItemDefinition  anObj= new ItemDefinition();
    anObj.setterFunctions(...);
    definitions[id]=anObj

Hope this works.

Getting a strange NullPointerException

1 Answers1