Deferencing Null Pointer Error

Question

I am kinda confuse with this piece of code. It keeps give me the error of "Deferencing Null Pointer".

bookStore.java

 @Override
protected store createOutlet (String storeName, String storeType) {
    store theStore = null;
        theStore.setStoreName(storeName); //getting Deferencing Null Pointer Error
        theStore.setStoreType(storeType);
    return theStore;
}

storeProducer.java

public abstract class storeProducer {
protected abstract store createOutlet(String storeName, String storeType);

public store createNewStore(String storeName, String storeType) {
    store newStore = createOutlet(storeName, storeType);
    newStore.createStore();

    return newStore;
}

store.java

public abstract class store extends Observable {
abstract void createStore();

What the problem in it? I already tried like throwing the exception but still not working.

I am ware of it, but if i remove it, my variables "theStore" will be shown not initialized. but if i create an instance it shows error of store is abstract, cannot be instantianed. — Chuah Cheng Jun, Dec 03 '15 at 03:39
You **must** have a concrete `store` type to use one at runtime. Use that. — Elliott Frisch, Dec 03 '15 at 03:52
Possible duplicate of [What is a Null Pointer Exception, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-null-pointer-exception-and-how-do-i-fix-it) — ΦXocę 웃 Пepeúpa ツ, Dec 03 '15 at 04:45

Emil Laine · Answer 1 · 2015-12-03T03:39:46.530

2

theStore is null and theStore.anything() will try to dereference the null pointer.

It seems you wanted to create a store instance, you can do that with new:

store theStore = new AnyNonAbstractClassDerivingFromStore();

edited Dec 03 '15 at 03:39

answered Dec 03 '15 at 03:29

Emil Laine

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it doesn't allow me as it created as an abstract in the store.java – Chuah Cheng Jun Dec 03 '15 at 03:32
Oh true, you need to `new` a non-abstract sub-class of `store`. – Emil Laine Dec 03 '15 at 03:39

Deferencing Null Pointer Error

1 Answers1