Android 透过 intent传值获得null

我在通过intent 获得传递兑现过的时候报错，空指针,我是getMap方法进行传值，代码如下

public void getMap(View view){         Intent i = new Intent(this, BreweryYourTopBeers.class);        Log.d("map" , e.beerBreweryId);        i.putExtra("breweryID",  e.beerBreweryId);        i.setClass(this, BreweryMap.class);         startActivity(i);    }

从我的日志中能够看到  在传值之前e.beerBreweryId  确实有值，我在下面的代码中获取改值

public class BreweryMap extends ActionbarMenu {    BeerData e;     String beerID;     GoogleMap map;    //从bundle  中获得beer  详细信息     protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);         setContentView(R.layout.activity_brewerymap);        //get brewery data        //get beer data         Intent intent = getIntent();         Bundle extras = intent.getExtras();          String breweryID = extras.getString("brewreyID");        map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();         String url = "http://api.brewerydb.com/v2/brewery/"+ breweryID +"?key=myKey&format=json&withLocations=y";        Log.d("map", url);         new myAsyncTask(this,map).execute(url);}}