FileDataStore dispose function throw nullPointer Exception

Question

im having trouble with the store of FileDataStore. It does the job for me but i found out that it throws java null pointer exception when i dispose it. I debbuged and im sure that the store is not null.

Here is my code :

    SimpleFeatureIterator iterator = null;
    FileDataStore store = null;
    try {
        store = FileDataStoreFinder.getDataStore(file);
        SimpleFeatureSource source = store.getFeatureSource();

        for (int i = 0; i < store.getFeatureReader().getFeatureType().getAttributeDescriptors().size(); i++) {
            names.add(store.getFeatureReader().getFeatureType().getAttributeDescriptors().get(i).getLocalName());
        }
        SimpleFeatureCollection features = source.getFeatures();
        iterator = features.features();
        while (iterator.hasNext()) {
            // copy the contents of each feature and transform the geometry
            SimpleFeature feature = iterator.next();
            shapeFileData.add(feature.getAttributes());
        }
    } catch (IOException e) {
        System.out.println(e.getLocalizedMessage());
        e.printStackTrace();
    }
    iterator.close();
    store.dispose();