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POjava.lang.NullPointerException at onPostExecute?
 

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    <p>I have this classes where in I'm sending a SOAP Request to a server. I have my Main Class, an AsyncTask Class, A Parser Class, an Interface. My problem is that I always get this NullpointerException. What I'm trying to do is in my Main Activity I will send a String to AsyncTask and then the result of onPostExecute in AsyncTask, I need to pass it to the Parser Class, In this part Im having problems. Im using an Interface from my previous question but It's not working.</p> <p>AsyncTask Class:</p> <pre><code>public class TestAsyncTask extends AsyncTask&lt;String, Void, String&gt; { public TestInterface delegate = null; String soapString = "http://-------------"; String serverString = "https:-----------"; @Override protected String doInBackground(String... sString) { String yourValue = sString[0]; String resString = null; //This will be the storage of the response. try { //Uses URL and HttpURLConnection for server connection URL url = new URL(serverString); HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection(); urlConnection.setDoOutput(true); urlConnection.setDoInput(true); urlConnection.setUseCaches(false); urlConnection.setChunkedStreamingMode(0); urlConnection.addRequestProperty("SOAPAction", soapString); urlConnection.addRequestProperty("Content-Type", "text/xml; charset=utf-8"); urlConnection.addRequestProperty("Content-Length", "" + yourValue.length()); urlConnection.setRequestMethod(HttpPost.METHOD_NAME); // Using OutputStream and Writer to send a request to the server. OutputStream outputStream = urlConnection.getOutputStream(); Writer writer = new OutputStreamWriter(outputStream); writer.write(yourValue); writer.flush(); writer.close(); //Using InputStream to get the response of the request from the server. InputStream inPutStream = urlConnection.getInputStream(); BufferedReader buffReader = new BufferedReader(new InputStreamReader(inPutStream)); ByteArrayBuffer byteBuffer = new ByteArrayBuffer(50); int resint = urlConnection.getResponseCode(); while ((resint = buffReader.read()) != -1) { byteBuffer.append(resint); } resString = new String(byteBuffer.toByteArray()); } catch (Exception aException) { resString = aException.getMessage(); } return resString; } protected void onPostExecute(String aReturnValueString) { //I THINK HERE IS WHERE THE PROBLEM EXIST delegate.processFinish(aReturnValueString); } } </code></pre> <p>Interface, This Im not sure:</p> <pre><code>public interface TestInterface { void processFinish(String output); } </code></pre> <p>Parser Class:</p> <pre><code>public class TestParser implements TestInterface { TestAsyncTask a= new TestAsyncTask(); TextView oTextView[], aTextView[], pTextView[], dTextView[]; //Create a new TextView array to store the parsing results. private LinearLayout linearLayout; int pars; Context contxt; //Constructor public TestParser(Context cContext){ contxt = cContext; //Pass Context to constructor } //Getter for LinearLayout. public LinearLayout getLinearLayout(){ return linearLayout; } //Setter for LinearLayout. public void setLinearLayout(LinearLayout aSetterLinearLayout){ this.linearLayout = aSetterLinearLayout; } public void onCreate(Bundle savedInstanceState) { a.delegate = this; } public void processFinish(String output) { // TODO Auto-generated method stub linearLayout = new LinearLayout(this); //The try/catch statement encloses some code and is used to handle errors and exceptions that might occur in that code. try { //Use SAXParser(Simple API for XML) to handle the parsing of XML(Response). */ SAXParserFactory saxParF = SAXParserFactory.newInstance(); SAXParser sAXPar = saxParF.newSAXParser(); XMLReader xMLReader = sAXPar.getXMLReader(); // Create handler to handle XML Tags (GBXMLHandler extends DefaultHandler). TestXMLHandler xMLHandler = new TestXMLHandler(); xMLReader.setContentHandler(xMLHandler); InputSource inputSource = new InputSource(new StringReader(output)); xMLReader.parse(inputSource); TestData data = TestXMLHandler.aData; int aone = data.getoName().size(); int atwo = data.getDes().size(); oTextView = new TextView[aone]; aTextView = new TextView[aone]; dTextView = new TextView[atwo]; pTextView = new TextView[atwo]; //The for statement provides a compact way to iterate over a range of values. for (pars = 0; pars + 1 &lt; atwo; pars++) { dTextView[pars] = new TextView(getApplicationContext()); dTextView[pars].setText("Description = " + data.getDes().get(pars)); linearLayout.addView(dTextView[pars]); pTextView[pars] = new TextView(getApplicationContext()); pTextView[pars].setText("RegularSellUnitPrice = " + data.getRegularSellUnitPrice().get(pars)); linearLayout.addView(pTextView[pars]); } for (pars = 0; pars &lt; aone; pars++){ oTextView[pars] = new TextView(getApplicationContext()); oTextView[pars].setText("OperatorName = " + data.getoName().get(pars)); linearLayout.addView(oTextView[pars]); aTextView[pars] = new TextView(getApplicationContext()); aTextView[pars].setText("type = " + data.getType().get(pars)); linearLayout.addView(aTextView[pars]); } } catch (Exception e) { System.out.println("XML Pasing Exception = " + e); } } } </code></pre>
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    1. USStella
    1. USStella
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    1. COcan you post the stacktrace? THis is a lot of code to just be asked to sift through and being told there is an error somewhere.
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      1. POjava.lang.NullPointerException at onPostExecute?
      1. USGreg Giacovelli
    2. COoh sorry. when running the app in the debugger. in my onPostExecute, the error exist.
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      1. POjava.lang.NullPointerException at onPostExecute?
      1. USStella
    3. COYour `TestParser` class is incorrect. First you shouldn't instantiate an `Activity` like you do otherwise the `onCreate` callback will not be called(so the `delegate` will be null hence the `NullPointerException`)
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      1. POjava.lang.NullPointerException at onPostExecute?
      1. USLuksprog
 

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