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PONullPointerException. Unable to read through stream
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  1. PONullPointerException. Unable to read through stream
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    copied!<p>I'm trying to make a http request to connect with an application and do authentication procedure.But i'm gettting <strong>NullpointerException</strong> .The connection object is not able to get the stream data.Which is causing a null pointer exception .Here is my code <br/></p> <pre><code>String api="URL of the application"; String query="format=json"; //Necessary Variables String publicKey=publickey; String privateKey=privatekey; String email=uemail; String password=upassword; String algo="HmacSHA1"; //identify Application long time=System.currentTimeMillis() / 1000; SecretKeySpec sks=new SecretKeySpec(privateKey.getBytes(),algo); try { Mac mac=Mac.getInstance(algo); mac.init(sks); String hash=""; byte[] digest=mac.doFinal((query+time).getBytes()); for (byte b : digest) { hash +=String.format("%02x", b); } //Make the request String url=api+"?"+query+"&amp;apikey="+publicKey+"&amp;hash="+hash+"&amp;t="+time; Log.d("URL", "url: "+url); try { HttpsURLConnection c=(HttpsURLConnection) new URL(url.trim()).openConnection(); c.setRequestProperty("Authorization","Basic "+DatatypeConverter.printBase64Binary((email+":"+password).getBytes())); InputStream iStream=null; try { ***iStream=c.getInputStream();*** } catch (Exception e) { iStream=c.getErrorStream(); } InputStreamReader iStreamReader=new InputStreamReader(iStream); BufferedReader bReader=new BufferedReader(iStreamReader); String result=""; String line=""; while ((line=bReader.readLine())!=null) { result +=line+"\n"; } } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InvalidKeyException e) { // TODO Auto-generated catch block e.printStackTrace(); } </code></pre> <p>Here is the Exception.</p> <pre><code>10-17 11:09:38.127: E/AndroidRuntime(864): FATAL EXCEPTION: main 10-17 11:09:38.127: E/AndroidRuntime(864): java.lang.NullPointerException 10-17 11:09:38.127: E/AndroidRuntime(864): at libcore.net.http.HttpEngine.writeRequestHeaders(HttpEngine.java:646) 10-17 11:09:38.127: E/AndroidRuntime(864): at libcore.net.http.HttpEngine.readResponse(HttpEngine.java:800) 10-17 11:09:38.127: E/AndroidRuntime(864): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:274) 10-17 11:09:38.127: E/AndroidRuntime(864): at libcore.net.http.HttpURLConnectionImpl.getErrorStream(HttpURLConnectionImpl.java:100) 10-17 11:09:38.127: E/AndroidRuntime(864): at libcore.net.http.HttpsURLConnectionImpl.getErrorStream(HttpsURLConnectionImpl.java:124) 10-17 11:09:38.127: E/AndroidRuntime(864): at com.arc.distimoapp.LoginScreen.loginDistimo(LoginScreen.java:113) 10-17 11:09:38.127: E/AndroidRuntime(864): at com.arc.distimoapp.LoginScreen$1.onClick(LoginScreen.java:62) 10-17 11:09:38.127: E/AndroidRuntime(864): at android.view.View.performClick(View.java:4084) 10-17 11:09:38.127: E/AndroidRuntime(864): at android.view.View$PerformClick.run(View.java:16966) 10-17 11:09:38.127: E/AndroidRuntime(864): at android.os.Handler.handleCallback(Handler.java:615) 10-17 11:09:38.127: E/AndroidRuntime(864): at android.os.Handler.dispatchMessage(Handler.java:92) 10-17 11:09:38.127: E/AndroidRuntime(864): at android.os.Looper.loop(Looper.java:137) 10-17 11:09:38.127: E/AndroidRuntime(864): at android.app.ActivityThread.main(ActivityThread.java:4745) 10-17 11:09:38.127: E/AndroidRuntime(864): at java.lang.reflect.Method.invokeNative(Native Method) 10-17 11:09:38.127: E/AndroidRuntime(864): at java.lang.reflect.Method.invoke(Method.java:511) 10-17 11:09:38.127: E/AndroidRuntime(864): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 10-17 11:09:38.127: E/AndroidRuntime(864): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-17 11:09:38.127: E/AndroidRuntime(864): at dalvik.system.NativeStart.main(Native Method) </code></pre>
 

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