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When trying to use google maps api calls I get runtime exception caused by nullpointer exception
This is because you are trying to get map field right away after setting content view, but it would be available only after fragment's onCreateView() call, so you should deffer getting map and operating on it till onCreateView().

Categories : Android

Nullpointer runtime exception
n = this.n; is probably the culprit. You are trying to refer to this.n before initializing it. You'll want to avoid using this in constructors unless you are initializing (not referencing) members of this. EDIT: I guess you meant this.n = n;? Just saw your comment, I guess that explains it. :)

Categories : Java

NullPointer Exception in Onclick
A NullPointerException means that you're trying to run something on a null object. (Well, not exactly, but that's basically it.) First of all, learn how to read a stack trace. It's a very important skill. Basically, go down the stack until you find a file that is yours. In this case, it's FocusWidget:102. Since I don't know which line 102 is, I'll just guess. Since you seem to be implying that the error is in that code snippet, and anything in the if statement can't be null since you're checking for it, my guess is that somehow the argument "listener" is null. I'm not sure, though. It'd be helpful if you could give us the entire block of code that's causing the issue, i.e. the scope around line 102.

Categories : Java

NullPointer exception and FileInputStream
Solution: Make sure that your Context is not null, I passed it in via function arguments, for example public void setPagerFile(String fileName,Context mContext){ then use mContext as your context.

Categories : Java

About NullPointer Exception in Arraylist
Your subListAdd is null. Check this code: PrcSubList subListAdd=coreService.addSubListByAddAlert(childSub); The error is thrown when you try to get the name of that element when it is appearantly null: listSl.get(0).getName() ^ calling getName() on null objects throws you that exception Also, there is something wrong with this line: if (listSl == null || listSl.size() == 0) { The == null is non needed check because you instantiate the list above. Also, the size is equal to zero because of the same reason.

Categories : Java

Nullpointer exception at startDisplayPreview()
try to use following code to check null exception: public void surfaceCreated(SurfaceHolder arg0) { if (mCamera == null) { mCamera = Camera.open(); // is mCamera null? if (mCamera == null) { Log.e("camera", "cannot open camera"); return; } // is mHolder null? if (mHolder == null) { Log.e("camera", "mHolder == null"); mHolder = getHolder(); } try { mCamera.setPreviewDisplay(mHolder); mCamera.startPreview(); } catch (IOException e) { // TODO Auto-generated catch block Log.d("", "Error setting camera preview: " + e.getMessage()); }

Categories : Android

Android Exception NullPointer
I can't find quesList in your example. If you mean msgList with it, I was thinking, that the result of the async task hasn't been written to msgList yet. You are calling showQuestion just very shortly after the task has been started. You are doing file io which is quite slow sometimes. Maybe, the JSONObject with index 0 is just null. Have you checked this already?

Categories : Android

publishInstallAsync NullPointer Exception
Ok, so the problem occurs due to the fact that you don't have Facebook application installed on your device. From the source code of publishInstallAndWaitForResponse(Context,String) method you can see this line: String attributionId = Settings.getAttributionId(context.getContentResolver()); In the getAttributionId(ContentResolver) is said: returns null if the facebook app is not present on the phone So, this is the problem. You get null for attributionId and thus publishing installs doesn't for for you.

Categories : Android

Nullpointer exception when adding to list
Why do you need to do all this? Why isn't this sufficient? // This has your data in it. List<Gladiators> gladiators = new ArrayList<Gladiators>(); // Obviously some attributes, including a unique key or name. // MUST override equals and hashcode properly Gladiator g = new Gladiator(); if (gladiators.contains(g)) { // do something here. } NullPointerException is one of the easiest problems to fix. Run your code in an IDE with debugging turned on and put a breakpoint where the stack trace says the exception occurred. You'll figure out quickly why something you assumed should not be null has violated your assumptions.

Categories : Java

NullPointer Exception Adapter getView
The problem appears to be that your list is not enabled for multiple selections (or for selections at all, apparently). From the docs for getCheckedItemPositions(): Returns: A SparseBooleanArray which will return true for each call to get(int position) where position is a position in the list, or null if the choice mode is set to CHOICE_MODE_NONE. Perhaps you meant to call getCheckedItemPosition() (without the "s")? Make sure that the list selection mode is set to the appropriate value.

Categories : Android

Android xml nullpointer exception xml parser
try public void getUrl(View v) { MyXMLHandler myXMLHandler; try { /** Handling XML */ SAXParserFactory spf = SAXParserFactory.newInstance(); SAXParser sp = spf.newSAXParser(); XMLReader xr = sp.getXMLReader(); /** Send URL to parse XML Tags */ URL sourceUrl = new URL("http://websitethatcontains/feed"); /** Create handler to handle XML Tags ( extends DefaultHandler ) */ myXMLHandler = new MyXMLHandler(); xr.setContentHandler(myXMLHandler); xr.parse(new InputSource(sourceUrl.openStream())); } catch (Exception e) { System.out.println("XML Parsing Exception = " + e); } if (MyXMLHandler != null){ /** Get result from MyXMLHandler SitlesList Object */ sitesList = MyXMLH

Categories : Android

animating a box in android getting a nullpointer exception
Swap the two lines: DV.box(x1, x2, y1, y2); DV = new DrawView(this); so that you instantiate DV before referencing it. DV = new DrawView(this); DV.box(x1, x2, y1, y2); Also, it's standard Java convention for variables and fields to start with lowercase.

Categories : Java

Getting NullPointer Exception when Switching between Activities
In Activity3 you used an intent to launch Activity2. You did not put any extras in it. Therefore, when you get the bundle in Activity2 Bundle recdData = getIntent().getExtras(); It is actually null. You should do a checking before using it, like this: Bundle recdData = getIntent().getExtras(); if(recdData != null) { actionArray=recdData.getParcelableArrayList("actionArray"); comedyArray=recdData.getParcelableArrayList("comedyArray"); } You should also know that using the current navigation, you will not have the actionArray and comedyArray as you expected when you launch Activity2 from Activity3.

Categories : Android

TimerTask returning nullpointer Exception
I cannot tell if you have a try before the if, but you can't use finally without at least a try. It might not go to the if if the alertingPools.isEmpty(), which means it never even initializes the executorService = Executors.newFixedThreadPool((Pools.length));. This would result in the finally clause coming back as null.shutdown causing problems. If possible, try to move the initialization before the if. I would start by trying to find out weather the alertingPools.isEmpty() or not.

Categories : Java

Why i am getting nullpointer exception at this.getWritableDatabase();, android?
Don't do the query related work inside your DatabaseHandler class. Keep it only for open, close, upgrade, create related work. Use the synchronized method call with explicit exception thrown. As a clue try like this: /** * open the db * @return this * @throws SQLException * return type: DatabaseHandler */ public synchronized DatabaseHandler open() throws SQLException { if(db == null || !db.isOpen()) this.db = getWritableDatabase(); return this; } Then for your rawquery define the method returning Cursor object: public synchronized Cursor rawQuery(String sql, String[] args) throws SQLException{ if(db == null || !db.isOpen()) this.open(); return db.rawQuery(sql, args); } Then in your

Categories : Android

Avoid nullpointer exception with ConcurrentHashMap
Do a null check on personAddress, calling get(null) throws a NPE. It's even specified in the method documentation

Categories : Java

nullpointer exception while starting another activity
you can try this way, because static value should be getting null in Getclicker Activty. So use as a key. intent.putExtra("EXTRA_MESSAGE", datevalue); intent.putExtra("EXTRA_MESSAGE1", Userselectvalue); and get the value this way @Override public void onCreate(Bundle savedInstanceState) { Intent intent = getIntent(); String datevalue = intent.getStringExtra("EXTRA_MESSAGE"); String Userselectvalue = intent.getStringExtra("EXTRA_MESSAGE1"); super.onCreate(savedInstanceState); setContentView(R.layout.activity_second);

Categories : Android

Nullpointer exception in LinkedList while using for-each loop
This is the internal implementation of LinkedList.ListItr.next(): public E next() { checkForComodification(); if (!hasNext()) throw new NoSuchElementException(); lastReturned = next; next = next.next; // your stacktrace says the NullPointerException happens here nextIndex++; return lastReturned.item; } The NullPointerException happens because the internal variable next is null; however, it seems that hasNext() is validating that there is a next element. It seems to me that: you have more than one thread modifying your list, OR you are modifying your list in the implementation of destroy() while iterating over the list. If you update your answer with your implementation of destroy() as sugested by @mthmulders, I either update, correct or delete m

Categories : Java

Nullpointer exception while getting EditText in an Activity
You should try: public class ImageDownloadFragment extends Fragment { private EditText ed; public ImageDownloadFragment() {} @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View v = inflater.inflate(R.layout.image_download, container, false); ed = (EditText)v.findViewById(R.id.url_text); return v; } } Since the EditText you want to retrieve is located (I suppose) inside your Fragment's layout.

Categories : Android

LIBGDX - SetScreen nullpointer Exception
In your TypingGame class you don't create a new instance of itself: TypingGame game; //------------------ this! ... gameOverScreen = new GameOverScreen(game); //----you don't pass the new "game", you pass "this" also you have to do the same to GameScreen. gameScreen = new GameScreen(this); //---like this You are getting a NPE because in GameScreen you are trying to use a Game that does not exist. You need to pass the instance of TypingGame using "this" to your GameScreen,and store it in the: TypingGame game; of your GameScreen. Also as a side note (but very important!),you are creating an instance of GameScreen and an instance of GameOverScreen but then every time you set a screen you create a new one...

Categories : Java

Nullpointer exception on Hashmap for CustomListAdapter?
Initialize FoodItems. You didn't. FoodItems = new ArrayList<HashMap<String, String>>(); BTW, start all your variable names with lowercase.

Categories : Java

NullPointer Exception in getWidth(), getHeight()
It may be that this ViewGroup hasn't been created yet. Check where you're trying to get the width and height of this object is actually being called after display objects such as views etc are being created. You can debug this by either placing breakpoints in the different loading methods such as onCreate, onResume or by placing NSLog's in them instead.

Categories : Android

NullPointer exception in scheduled method
if(headHunterService!=null){ headHunterService.addHeadHunter("Moscow", 100, 100) ; }else{ Sysem.out.println("headHunterService Object is null"); } if headHunterService return null please make sure the following code present in your context. <context:annotation-config/> <context:component-scan base-package="your.package.name.here"/> Make sure the following class annotate with @Component @Component class HeadHunterService { } or you need the setter injection for headHunterService

Categories : Java

nullpointer exception on session retrieval
Your call session.getAttribute("frienddet") is returning null because "frienddet" isn't initialized (a guess on my part, it could be initialized to null). Looking at your code you're not actually using the entity manager (I assume this is in the omitted code below). As such, you need to look at where "frienddet" is put into your session and find out why it is null there. If you jump into the debugger (which I would really recommend) you should see your session object missing a key/value pair or a key to a null.

Categories : JSF

Nullpointer exception quartz integration with spring
The answer is, unfortunately, simple: sourceDao is null. Quartz instantiates the job classes by itself. The only way to pass a parameter to that class is to use the JobExecutionContext in executeInternal(). First, when you scheduleJob() you have to set the JobDetails. JobDetail thisJobDetail = new SimpleJobDetail<T>(this.getClass().getName(), (Class<? extends AbstractQuartzJob<T>>) this.getClass()); thisJobDetail.getJobDataMap().put(DATA_MANAGER_MAP_KEY, dataManager); sched.scheduleJob(thisJobDetail ,aTrigger); Then, when you are executing the job, you can access the details like this: this.dataManager = (DataManager) jobContext.getJobDetail() .getJobDataMap().get(DATA_MANAGER_MAP_KEY); In your case use sourceDao a

Categories : Java

Simple calculation returning NullPointer exception... why?
At the time this line executes private Double Split = (Double.parseDouble(Total) * ((double)Tip / 100)) / (double)People; The fields Total and others have not been initialized by the constructor and have a default value of null. parseDouble() must throw a NullPointerException if its argument is null (I cannot verify this, it might also come from dereferencing). Declare that field private Double Split; and do the assignment in the constructor Bill (String total, int people, int tip) { Total = total; Tip = tip; People = people; Split = (Double.parseDouble(Total) * ((double)Tip / 100)) / (double)People; } Advice: Java non-constant instance variables should start with a lowercase alphabetical character.

Categories : Java

Parsing JSONObject but running into NullPointer exception
Iterators can only be traversed once. This means that once you do metricsIterator.next() in System.out.println(metricsIterator.next().toString());, you end up using up that value and when you call .next() again in value = (Number) jsonObj.get(metricsIterator.next()); you get the value after the one that you are expecting, in other words you skip a value. As a result when you hit the last value, the next value is null which results in the null pointer. Try removing the sysout before assignment to value, it should solve the nullpointer.

Categories : Java

Struts2 Annotation Valiation NullPointer Exception
Foud the solution the problem was in my validators.xml <!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator Config 1.0//EN" "http://www.opensymphony.com/xwork/xwork-validator-config-1.0.dtd"> repleced width : <!DOCTYPE validators [ <!ELEMENT validators (validator)+> <!ELEMENT validator (#PCDATA)> <!ATTLIST validator name CDATA #REQUIRED class CDATA #REQUIRED > ]>

Categories : Validation

NullPointer Exception while updating UI from AsyncTask is Finished
I think for your ProgressDialog null and async onPreExecute method override implement and solve for your excepiton, @Override protected void onPreExecute() { super.onPreExecute(); mProgressDialog = ProgressDialog.show(YourActivityName.this, "wait", "loading"); }

Categories : Java

Why does this Hashmap Iteration not work? I get a NullPointer Exception
It looks like you are putting EMPLOYEE into the map before it has been initialized, so it will be null (and remain so, even if you assign something to EMPLOYEE later). Reverse the order of the two statements. Or, while in general I disapprove of the double-brace-initializer (hopefully, we'll get proper Collection literals in Java 8): public static Map<String, Map<String, String>> INDEXED_TABLES = new HashMap<String, Map<String, String>>(){{ put("employee", new HashMap<String, String>(){{ put("name", "Test"); put("age", "Test"); put("sex", "test"); }} }}

Categories : Java

NullPointer.Exception PopupWindow.getMaxAvailableHeight using ListPopupWindow
Ok. This is not the solution for this error but it's a alternative route that I found. First I created this variables private LayoutInflater popupWindowInflaterAcoesMusculares; private View viewPopupWindowAcoesMusculares; private PopupWindow popupWindowAcoesMusculares; Next on my onCreate method I use this code popupWindowInflaterAcoesMusculares = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); viewPopupWindowAcoesMusculares = popupWindowInflaterAcoesMusculares.inflate(R.layout.content_acoes_musculares, null,true); vp_contentAcoesMusculares_SequenciaExercicios = (ViewPager) viewPopupWindowAcoesMusculares.findViewById(R.id.vp_contentAcoesMusculares_SequenciaExercicios); tv_contentAcoesMusculares_NomeSequencia = (TextView) viewPopupWindowAcoesMusculares.findViewById

Categories : Android

Java Socket ArrayList NullPointer Exception
If you get an NPE at connections.add(socket), it can only be because connections is null. Which it is, because you haven't constructed an instance of Server: instead you are trying to execute all its code from main(). The only place you call new Server() from is inside the constructor for Server, which you have clearly never executed at all, as you would have got a StackOverflowError from the infinite recursion. This code is a real mess: fix the infinite recursion construct an instance of Server in your main() method make connections non-static make socket a local variable in the accept loop fix your loops to iterate from 0 to connections.size()-1 and try again.

Categories : Sockets

.setPreviewDisplay(holder) creating NullPointer exception
If you are crashing with a NullPointerException in the surfaceCreated() method shown above, then it should be obvious what your problem is: camera is null. Since you are passing camera into the constructor of CamPreview, you will need to investigate how you are calling this constructor.

Categories : Java

Getting NullPointer Exception when declaring LinkedBlockingQueue
Array workerQueue is not instantiated which you need to do. private BlockingQueue<String>[] workerQueue; workerQueue is a reference of BlockingQueue<String>[] type, not a Object. But also you cannot create a generic array of BlockingQueue<String>. Instead of that create a List of BlockingQueue<String>. Ex - private List<BlockingQueue<String>> workerQueue= new ArrayList<>(); you can also create the list Object at constructor. private List<BlockingQueue<String>> workerQueue= new ArrayList<>(); public QueueThreadPool(int numThreads, int numQueues) { this.workerQueue = new ArrayList<>(numQueues); // <-- initialize the field. this.numQueues = numQueues; this.numThreads = numThreads; ...

Categories : Java

nullpointer exception on statement = conn.createStatement();
As the exception trace says your conn object is null and hence calling any method on it will cause NullPointerException. You need to check your code where you are initializing your conn object to initialize it properly. Also it is always a good practice to put a null check to avoid null pointer exception.

Categories : Java

NullPointer exception when executing prepared statement
In "insertRows", you call a method on your class variable "connect" which is never initialized. Instead of: Connection connect = DriverManager.getConnection(db_connect_string ,db_userid, db_password); do: this.connect = DriverManager.getConnection(db_connect_string ,db_userid, db_password); That should do the trick.

Categories : Java

NullPointer Exception while passing Bundle from Activity to Fragment
Create a Static method in your fragment and just pass the Bundle argument to that method that is the simplest method I have found till now. below Would be a format of the method in your fragment Bundle arg; public static void setArguments(Bundle Args) { arg=Args; } and from where you want to set the Arguments just call in this fashion YourFragment.setArguments(Args); Hope You will find this answer helpful

Categories : Android

android - LAN socket programming -- getting nullpointer and address-in use exception
Well it's obvious that you setup your server on port 9999: serverSocket = new ServerSocket(9999); But you connect with the server on port 4444: socket = new Socket("192.168.1.74", 4444); Make sure you connect to the correct port-number otherwise it wont work. Hope this helps.

Categories : Android

Oracle11g+hibernate 4.2 buildSessionFactory throws Nullpointer exception
Have you try the new code for build session factory? SessionFactory factory = null; try { Configuration configuration = new Configuration(); configuration.configure("resources/hibernate.cfg.xml"); ServiceRegistryBuilder serviceRegistryBuilder = new ServiceRegistryBuilder(); serviceRegistryBuilder.applySettings(configuration.getProperties()); serviceRegistry = serviceRegistryBuilder.buildServiceRegistry(); factory = configuration.buildSessionFactory(serviceRegistry); } catch (Throwable ex) { System.err.println("Initial SessionFactory creation failed."); ex.printStackTrace(); throw new ExceptionInInitializerError(ex); }

Categories : Oracle

Android Sqlite java.lang.nullpointer exception
You are using ourDatabase variable without initializing it. So not only insert you will get nullpointerexception everywhere where you are using ourDatabase variable you can use something like following in constructor. SQLiteDatabase db = context.openOrCreateDatabase(DATABASE_NAME, Context.MODE_PRIVATE, null);

Categories : Java



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