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POFacebook Graph API request error when using HTTP POST / DELETE method
 

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  1. POFacebook Graph API request error when using HTTP POST / DELETE method
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    <p>I'm developing an Android app which is integrated with Facebook SDK.</p> <p>First I'm fetching the feeds of a Facebook page using Graph API, which is working fine. I want to allow the users to like &amp; post comments against each feed.</p> <p>I'm using the following code snippet for <strong>Like</strong></p> <pre><code>Bundle parameters = new Bundle(); parameters.putString("access_token", access_token); String response = null; String id = &lt;Target Feed ID&gt;; try { response = facebook.request(id+"/likes", parameters, "POST"); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } Log.i("FB Like Output", ""+response); </code></pre> <p>But I'm getting NullPointerException at the following line:</p> <pre><code>response = facebook.request(id+"/likes", parameters, "POST"); </code></pre> <p>Please note that this error occurs <strong>only when I'm using "POST" or "DELETE" as the 3rd parameter</strong>. Instead if i'm using GET I get a proper response (which however, won't serve my purpose). </p> <p>Also, I've added relevant permissions like <strong>publish_stream</strong>.</p> <p>Is this the correct syntax for making a Synchronous request using HTTP POST method ?</p> <pre><code>04-25 16:29:08.332: E/AndroidRuntime(710): FATAL EXCEPTION: main 04-25 16:29:08.332: E/AndroidRuntime(710): java.lang.NullPointerException 04-25 16:29:08.332: E/AndroidRuntime(710): at java.net.URLDecoder.decode(URLDecoder.java:130) 04-25 16:29:08.332: E/AndroidRuntime(710): at java.net.URLDecoder.decode(URLDecoder.java:68) 04-25 16:29:08.332: E/AndroidRuntime(710): at com.facebook.android.Util.openUrl(Util.java:186) 04-25 16:29:08.332: E/AndroidRuntime(710): at com.facebook.android.Facebook.requestImpl(Facebook.java:806) 04-25 16:29:08.332: E/AndroidRuntime(710): at com.facebook.android.Facebook.request(Facebook.java:794) 04-25 16:29:08.332: E/AndroidRuntime(710): at com.test.myapp.adapters.FacebookAdapter$1.onClick(FacebookAdapter.java:107) 04-25 16:29:08.332: E/AndroidRuntime(710): at android.view.View.performClick(View.java:2408) 04-25 16:29:08.332: E/AndroidRuntime(710): at android.view.View$PerformClick.run(View.java:8816) 04-25 16:29:08.332: E/AndroidRuntime(710): at android.os.Handler.handleCallback(Handler.java:587) 04-25 16:29:08.332: E/AndroidRuntime(710): at android.os.Handler.dispatchMessage(Handler.java:92) 04-25 16:29:08.332: E/AndroidRuntime(710): at android.os.Looper.loop(Looper.java:123) 04-25 16:29:08.332: E/AndroidRuntime(710): at android.app.ActivityThread.main(ActivityThread.java:4627) 04-25 16:29:08.332: E/AndroidRuntime(710): at java.lang.reflect.Method.invokeNative(Native Method) 04-25 16:29:08.332: E/AndroidRuntime(710): at java.lang.reflect.Method.invoke(Method.java:521) 04-25 16:29:08.332: E/AndroidRuntime(710): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 04-25 16:29:08.332: E/AndroidRuntime(710): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 04-25 16:29:08.332: E/AndroidRuntime(710): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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    1. USSourav
    1. USSourav
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    1. COThis NPE happens before the request is even made. You should run the debugger from where you make the request, and make sure that what's being passed into the openUrl is not null.
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      1. USMing Li
    2. CO@Ming Li ran the debugger but didn't find any null values being passed at that point...further this exception does not occur when I'm using GET as the 3rd param...Is this the correct syntax for making a Synchronous request using POST?
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      1. USSourav
    3. COWhere are you getting your access_token from when you call parameters.putString("access_token", access_token)? From the NPE, Util.java:186 is when the code tries to url decode the access token, and that's where it's getting the null pointer.
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      1. USMing Li
 

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