title: java.lang.RuntimeException: Unable to instantiate activity ComponentInfo .... java.lang.ClassNotFoundException
body: <p>I have a problem that I'm dealing with since three days and I have tried to read different answers but it didn't help.
  Can someone help me too!!
  I write Ancdroid app as client to a restful web service. I can get data from the database without a problem but my problem is with my 2 Activities that I am using to work with this file got from a database. </p>
  
  <p>Main activity</p>
  
  <pre><code>public class MainActivity extends Activity  {
  
  
  
  private static final String SERVICE_URL = "http://10.0.2.2:8080/.....";
  private static final String TAG = "AndroidRESTClientActivity";   
      /** Called when the activity is first created. */
      @Override
      public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
      }
  
      public void retrieveSampleData(View vw) {
          EditText idTxt = (EditText) findViewById(R.id.id_textfield);
          String id = idTxt.getText().toString();
          String sampleURL = SERVICE_URL +"daten/"+id ;
  
          Log.d("getrespond()", "service calling");
  String url =sampleURL;
  
                         RestClient client = new RestClient(url);
  
                         try{
                             client.Execute(RestClient.RequestMethod.GET,this.getApplicationContext());
                         }
                         catch (Exception e) {
  
                             String error = String.valueOf(e);
                                  Log.d("**********client.Execute(RequestMethod.GET);***********",error);    
  
                         }
  
                         try {
  
                             if(client.getResponseCode() == 200) {
  
                                 Log.d("Response is 200", String.valueOf(client.getResponse().length()));
                                 System.out.println(this.getFilesDir().getPath().toString());
                                 File daten= client.getResponse();
                                    System.out.println(daten.getName());                       
  
                                 Toast.makeText(this.getApplicationContext(), "Responce is "+String.valueOf(client.getResponseCode()), 2000).show();                            
  
                         }  else {
                                 String error = String.valueOf(client.getResponse());
                                 Log.d("Response*********** not 200 ************", String.valueOf(client.getResponse()));
  
                             }
  
                         }catch (Exception e) {
                             e.printStackTrace();
                              Log.d("EXCEPTIONI IS 3", e.toString());
                             // TODO: handle exception
                         }
                         startActivity(new Intent("android.intent.action.LINEGRAPH"));
  </code></pre>
  
  <p>the other activity that I start from the main:</p>
  
  <pre><code>public class lineGraph extends Activity{
  
  
  
         @Override
      public void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);             
              setContentView(R.layout.activity_line_graph);
         }
  
         @Override
      protected void onResume() { 
             super.onResume(); 
             if (mChartView == null) { 
               LinearLayout layout = (LinearLayout) findViewById(R.id.chart); 
               try {
                  mChartView = ChartFactory.getLineChartView(this, getDemoDataset(), 
                          getDemoRenderer());
              } catch (IOException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              } 
               layout.addView(mChartView, new LayoutParams 
           (LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); 
  
             } else { 
               mChartView.repaint(); 
             } 
           }
  </code></pre>
  
  <p>Manifest.xml</p>
  
  <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.praktikum.androidcrestclient"
      android:versionCode="1"
      android:versionName="1.0" &gt;
  
      &lt;uses-sdk
          android:minSdkVersion="8"
          android:targetSdkVersion="15" /&gt;
  
      &lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" &gt;
      &lt;/uses-permission&gt;
      &lt;uses-permission android:name="android.permission.INTERNET" &gt;
      &lt;/uses-permission&gt;
      &lt;uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" /&gt;
      &lt;uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /&gt;
      &lt;uses-permission android:name="android.permission.READ_CONTACTS" /&gt;
      &lt;application
          android:icon="@drawable/ic_launcher"
          android:label="@string/app_name"
          android:theme="@style/AppTheme" &gt;
          &lt;activity
              android:name=".MainActivity"
              android:label="@string/title_activity_main" &gt;
              &lt;intent-filter&gt;
                  &lt;action android:name="android.intent.action.MAIN" /&gt;
  
                  &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
              &lt;/intent-filter&gt;
          &lt;/activity&gt;
          &lt;activity
              android:name="com.praktikum.androidcrestclient.LineGraph"
              android:label="@string/title_activity_line_graph" &gt;
              &lt;intent-filter&gt;
                  &lt;action android:name="android.intent.action.LINEGRAPH" /&gt;
                  &lt;category android:name="android.intent.category.DEFAULT" /&gt;
              &lt;/intent-filter&gt;
          &lt;/activity&gt;
          &lt;activity android:name="org.achartengine.GraphicalActivity"/&gt;
      &lt;/application&gt;
  
  &lt;/manifest&gt;
  </code></pre>
  
  <p>and here my LogCat </p>
  
  <pre><code>10-08 09:23:10.140: D/AndroidRuntime(4706): Shutting down VM
  10-08 09:23:10.140: W/dalvikvm(4706): threadid=1: thread exiting with uncaught exception (group=0x40015560)
  10-08 09:23:10.161: E/AndroidRuntime(4706): FATAL EXCEPTION: main
  10-08 09:23:10.161: E/AndroidRuntime(4706): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.praktikum.androidcrestclient/com.praktikum.androidcrestclient.LineGraph}: java.lang.ClassNotFoundException: com.praktikum.androidcrestclient.LineGraph in loader dalvik.system.PathClassLoader[/data/app/com.praktikum.androidcrestclient-1.apk]
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at android.os.Handler.dispatchMessage(Handler.java:99)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at android.os.Looper.loop(Looper.java:123)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at android.app.ActivityThread.main(ActivityThread.java:3683)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at java.lang.reflect.Method.invokeNative(Native Method)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at java.lang.reflect.Method.invoke(Method.java:507)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at dalvik.system.NativeStart.main(Native Method)
  10-08 09:23:10.161: E/AndroidRuntime(4706): Caused by: java.lang.ClassNotFoundException: com.praktikum.androidcrestclient.LineGraph in loader dalvik.system.PathClassLoader[/data/app/com.praktikum.androidcrestclient-1.apk]
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
  10-08 09:23:10.161: E/AndroidRuntime(4706):     ... 11 more
  10-08 09:23:10.180: W/ActivityManager(89):   Force finishing activity com.praktikum.androidcrestclient/.LineGraph
  10-08 09:23:10.180: W/ActivityManager(89):   Force finishing activity com.praktikum.androidcrestclient/.MainActivity
  10-08 09:23:10.690: W/ActivityManager(89): Activity pause timeout for HistoryRecord{4094eea0 com.praktikum.androidcrestclient/.LineGraph}
  10-08 09:23:12.330: I/Process(4706): Sending signal. PID: 4706 SIG: 9
  10-08 09:23:12.350: I/ActivityManager(89): Process com.praktikum.androidcrestclient (pid 4706) has died.
  10-08 09:23:12.360: E/InputDispatcher(89): channel '4065ae98 com.praktikum.androidcrestclient/com.praktikum.androidcrestclient.MainActivity (server)' ~ Consumer closed input channel or an error occurred.  events=0x8
  10-08 09:23:12.360: E/InputDispatcher(89): channel '4065ae98 com.praktikum.androidcrestclient/com.praktikum.androidcrestclient.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
  10-08 09:23:12.490: I/WindowManager(89): WIN DEATH: Window{4065ae98 com.praktikum.androidcrestclient/com.praktikum.androidcrestclient.MainActivity paused=true}
  10-08 09:23:12.500: I/WindowManager(89): WIN DEATH: Window{406c1140 Toast paused=false}
  10-08 09:23:12.600: W/InputManagerService(89): Got RemoteException sending setActive(false) notification to pid 4706 uid 10034
  10-08 09:23:12.660: E/InputDispatcher(89): Received spurious receive callback for unknown input channel.  fd=168, events=0x8
  10-08 09:23:16.820: D/dalvikvm(396): GC_EXPLICIT freed 7K, 54% free 2537K/5511K, external 1625K/2137K, paused 43ms
  10-08 09:23:21.626: W/ActivityManager(89): Activity destroy timeout for HistoryRecord{4094e768 com.praktikum.androidcrestclient/.MainActivity}
  10-08 09:23:21.626: W/ActivityManager(89): Activity destroy timeout for HistoryRecord{4094eea0 com.praktikum.androidcrestclient/.LineGraph}
  10-08 09:23:21.900: D/dalvikvm(299): GC_EXPLICIT freed 12K, 55% free 2589K/5703K, external 1625K/2137K, paused 73ms
  10-08 09:23:26.950: D/dalvikvm(407): GC_EXPLICIT freed 4K, 55% free 2532K/5511K, external 1625K/2137K, paused 57ms
  10-08 09:24:54.097: D/SntpClient(89): request time failed: java.net.SocketException: Address family not supported by protocol
  10-08 09:29:54.106: D/SntpClient(89): request time failed: java.net.SocketException: Address family not supported by protocol
  10-08 09:34:54.130: D/SntpClient(89): request time failed: java.net.SocketException: Address family not supported by protocol
  </code></pre>
  
  <p>Can you please help me to find why it doesn't find this other activity.</p>
  
  <p>Thank you</p>