Hallo!
Ich schreibe gerade eine Java Applikation in Android Studio. Ich versuche bei einem Webservice etwas auszulesen doch beim Debugging stürzt meine App sofort ab. Fehlermeldung: 
												| 1:2:
 3:
 4:
 5:
 6:
 7:
 8:
 9:
 10:
 11:
 12:
 13:
 14:
 15:
 16:
 17:
 18:
 19:
 20:
 21:
 22:
 23:
 24:
 25:
 26:
 27:
 28:
 29:
 30:
 31:
 32:
 33:
 34:
 35:
 36:
 37:
 38:
 39:
 40:
 41:
 42:
 43:
 44:
 45:
 46:
 47:
 
 | 01-31 12:27:51.238  15927-15951/? E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1Process: com.sami.hello.databasetest, PID: 15927
 java.lang.RuntimeException: An error occured while executing doInBackground()
 at android.os.AsyncTask$3.done(AsyncTask.java:304)
 at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
 at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
 at java.util.concurrent.FutureTask.run(FutureTask.java:242)
 at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
 at java.lang.Thread.run(Thread.java:818)
 Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Ljavax/microedition/io/Connector;
 at org.ksoap2.transport.ServiceConnectionMidp.<init>(Unknown Source)
 at org.ksoap2.transport.HttpTransport.getServiceConnection(Unknown Source)
 at org.ksoap2.transport.HttpTransport.call(Unknown Source)
 at com.sami.hello.databasetest.MainActivity.getHelloWorld(MainActivity.java:80)
 at com.sami.hello.databasetest.MainActivity$GibVonDatabase.doInBackground(MainActivity.java:49)
 at com.sami.hello.databasetest.MainActivity$GibVonDatabase.doInBackground(MainActivity.java:38)
 at android.os.AsyncTask$2.call(AsyncTask.java:292)
 at java.util.concurrent.FutureTask.run(FutureTask.java:237)
 at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
 at java.lang.Thread.run(Thread.java:818)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "javax.microedition.io.Connector" on path: DexPathList[[zip file "/data/app/com.sami.hello.databasetest-1/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
 at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
 at org.ksoap2.transport.ServiceConnectionMidp.<init>(Unknown Source)
 at org.ksoap2.transport.HttpTransport.getServiceConnection(Unknown Source)
 at org.ksoap2.transport.HttpTransport.call(Unknown Source)
 at com.sami.hello.databasetest.MainActivity.getHelloWorld(MainActivity.java:80)
 at com.sami.hello.databasetest.MainActivity$GibVonDatabase.doInBackground(MainActivity.java:49)
 at com.sami.hello.databasetest.MainActivity$GibVonDatabase.doInBackground(MainActivity.java:38)
 at android.os.AsyncTask$2.call(AsyncTask.java:292)
 at java.util.concurrent.FutureTask.run(FutureTask.java:237)
 at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
 at java.lang.Thread.run(Thread.java:818)
 Suppressed: java.lang.ClassNotFoundException: javax.microedition.io.Connector
 at java.lang.Class.classForName(Native Method)
 at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
 at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
 ... 13 more
 Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
 | 
		
	  
Meine MainActivity:
public class MainActivity extends Activity {
												| 1:2:
 3:
 4:
 5:
 6:
 7:
 8:
 9:
 10:
 11:
 12:
 13:
 14:
 15:
 16:
 17:
 18:
 19:
 20:
 21:
 22:
 23:
 24:
 25:
 26:
 27:
 28:
 29:
 30:
 31:
 32:
 33:
 34:
 35:
 36:
 37:
 38:
 39:
 40:
 41:
 42:
 43:
 44:
 45:
 46:
 47:
 48:
 49:
 50:
 51:
 52:
 53:
 54:
 55:
 56:
 57:
 58:
 59:
 60:
 61:
 62:
 63:
 64:
 65:
 66:
 67:
 68:
 69:
 70:
 71:
 72:
 73:
 74:
 75:
 76:
 77:
 78:
 79:
 80:
 81:
 82:
 83:
 84:
 85:
 86:
 87:
 88:
 89:
 90:
 91:
 92:
 93:
 
 |     public static String SOAP_ACTION = "http://tempuri.org/BenutzerAuslesen";public static String NAMESPACE = "http://tempuri.org/";
 public static String METHOD_BENUTZER_AUSLESEN = "BenutzerAuslesen";
 public static String URL = "http://localhost:14988/Service1.asmx";
 
 public EditText et;
 private static String m_ausgabe;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 
 et = (EditText)findViewById(R.id.txt_box);
 new GibVonDatabase().execute();
 
 }
 
 public class GibVonDatabase extends AsyncTask<Void, Void, Void> {
 @Override
 protected void onPreExecute() {
 super.onPreExecute();
 et.setText("PreExecute");
 
 }
 
 @Override
 protected Void doInBackground(Void... params) {
 
 getHelloWorld();
 
 return null;
 }
 
 @Override
 protected void onPostExecute(Void aVoid) {
 
 et.setText(m_ausgabe);
 }
 }
 public void getHelloWorld() {
 SoapObject request = new SoapObject(NAMESPACE, METHOD_BENUTZER_AUSLESEN);
 
 request.addProperty("benutzerauslesen", null);
 SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
 envelope.setOutputSoapObject(request);
 envelope.dotNet = true;
 HttpTransport transport = new HttpTransport(URL);
 
 try
 {
 transport.call(SOAP_ACTION, envelope);
 SoapPrimitive response = (SoapPrimitive) envelope.getResponse();
 m_ausgabe = response.toString();
 }
 catch (Exception e)
 {
 m_ausgabe = "FEHLER";
 }
 }
 
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
 getMenuInflater().inflate(R.menu.menu_main, menu);
 return true;
 }
 
 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
 int id = item.getItemId();
 
 if (id == R.id.action_settings) {
 return true;
 }
 
 return super.onOptionsItemSelected(item);
 }
 
 }
 | 
		
	  
Bitte um Hilfe komme nicht weiter.
lg