Very Simple XMPP client in Android

Question

I am trying to create a basic message passing infrastructure using XMPP servers and have succeeded in doing so quite elegantly using Python. Small, predefined messages are being successfully sent and received on Python. Now the next task is to send similar messages from and Android phone. Note I really do not need the full chat client functionality that is available from Xabber style clients.

I am new to Android and have not really worked on Java, Eclipse. Nevertheless, I have taken a basic "Hello World" program (the blank activity template) in Android and have "enhanced" with some basic XMPP code taken from igniterealtime website. So the MainActivity.java program looks like this :

package com.yantrajaal.pm1324;

import java.io.IOException;

import org.jivesoftware.smack.AbstractXMPPConnection;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.tcp.XMPPTCPConnection;
import org.jivesoftware.smack.tcp.XMPPTCPConnectionConfiguration;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
         XMPPTCPConnectionConfiguration.Builder configBuilder = XMPPTCPConnectionConfiguration.builder();
           configBuilder.setUsernameAndPassword("userid", "xxxxxx");
           //configBuilder.setResource("SomeResource");
           configBuilder.setServiceName("adastra.re");

           AbstractXMPPConnection connection = new XMPPTCPConnection(configBuilder.build());
           // Connect to the server
           try {
            connection.connect();
        } catch (SmackException | IOException | XMPPException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
           // Log into the server
           try {
                connection.login();
            } catch (SmackException | IOException | XMPPException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

the smack libraries that i have included are

/home/hduser/workspace/PM1324/libs/smack-tcp-4.1.4.jar
/home/hduser/workspace/PM1324/libs/smack-android-4.1.4.jar
/home/hduser/workspace/PM1324/libs/android-support-v4.jar
/home/hduser/workspace/PM1324/libs/smack-core-4.1.4.jar

plus

/home/hduser/eclipse-android-sdks/platforms/android-23/android.jar

after including these libraries and importing various classes, there are no Compile time errors in the program :-)

However when I am executing the program in the Simulator, the program crashes (stops working) immediately on startup. Even the "Hello World" string does not show up.

The relevent part of the log shows the following:

10-12 16:41:42.860: E/AndroidRuntime(893): FATAL EXCEPTION: main
10-12 16:41:42.860: E/AndroidRuntime(893): Process: com.yantrajaal.pm1324, PID: 893
10-12 16:41:42.860: E/AndroidRuntime(893): java.lang.NoClassDefFoundError: org.jxmpp.util.XmppStringUtils
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.provider.ProviderManager.getKey(ProviderManager.java:314)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.provider.ProviderManager.addStreamFeatureProvider(ProviderManager.java:304)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.provider.ProviderManager.addLoader(ProviderManager.java:140)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.initializer.UrlInitializer.initialize(UrlInitializer.java:54)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackInitialization.loadSmackClass(SmackInitialization.java:232)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackInitialization.parseClassesToLoad(SmackInitialization.java:193)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackInitialization.processConfigFile(SmackInitialization.java:163)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackInitialization.processConfigFile(SmackInitialization.java:148)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackInitialization.<clinit>(SmackInitialization.java:116)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.SmackConfiguration.getVersion(SmackConfiguration.java:96)
10-12 16:41:42.860: E/AndroidRuntime(893):  at org.jivesoftware.smack.ConnectionConfiguration.<clinit>(ConnectionConfiguration.java:38)
10-12 16:41:42.860: E/AndroidRuntime(893):  at com.yantrajaal.pm1324.MainActivity.onCreate(MainActivity.java:22)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.Activity.performCreate(Activity.java:5231)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.ActivityThread.access$800(ActivityThread.java:135)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.os.Handler.dispatchMessage(Handler.java:102)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.os.Looper.loop(Looper.java:136)
10-12 16:41:42.860: E/AndroidRuntime(893):  at android.app.ActivityThread.main(ActivityThread.java:5001)
10-12 16:41:42.860: E/AndroidRuntime(893):  at java.lang.reflect.Method.invokeNative(Native Method)
10-12 16:41:42.860: E/AndroidRuntime(893):  at java.lang.reflect.Method.invoke(Method.java:515)
10-12 16:41:42.860: E/AndroidRuntime(893):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
10-12 16:41:42.860: E/AndroidRuntime(893):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
10-12 16:41:42.860: E/AndroidRuntime(893):  at dalvik.system.NativeStart.main(Native Method)

I would be grateful if someone can please guide me on what am I doing wrong and how I could fix the same.

Thank you in advance for any suggestions, guidance provided.

NEW ISSUE / PROBLEM

The FATAL EXCEPTION and the NoClassDefFoundError has been addressed [ see second answer below ] but now I am getting another problem with the XMPP calls. [ I did not want to create another question on the same problem, so I am continuing here ]

Now the program executes, does not abort but fails to connect to the XMPP server and the log shows the following warning.

10-13 08:48:44.065: W/System.err(1049): org.jivesoftware.smack.SmackException$ConnectionException: The following addresses failed: 'adastra.re:5222' failed because android.os.NetworkOnMainThreadException
10-13 08:48:44.085: W/System.err(1049):     at org.jivesoftware.smack.tcp.XMPPTCPConnection.connectUsingConfiguration(XMPPTCPConnection.java:596)
10-13 08:48:44.085: W/System.err(1049):     at org.jivesoftware.smack.tcp.XMPPTCPConnection.connectInternal(XMPPTCPConnection.java:830)
10-13 08:48:44.085: W/System.err(1049):     at org.jivesoftware.smack.AbstractXMPPConnection.connect(AbstractXMPPConnection.java:360)
10-13 08:48:44.095: W/System.err(1049):     at com.example.pm707.MainActivity.onCreate(MainActivity.java:32)
10-13 08:48:44.095: W/System.err(1049):     at android.app.Activity.performCreate(Activity.java:5231)
10-13 08:48:44.095: W/System.err(1049):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-13 08:48:44.095: W/System.err(1049):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
10-13 08:48:44.095: W/System.err(1049):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
10-13 08:48:44.095: W/System.err(1049):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
10-13 08:48:44.095: W/System.err(1049):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
10-13 08:48:44.095: W/System.err(1049):     at android.os.Handler.dispatchMessage(Handler.java:102)
10-13 08:48:44.095: W/System.err(1049):     at android.os.Looper.loop(Looper.java:136)
10-13 08:48:44.095: W/System.err(1049):     at android.app.ActivityThread.main(ActivityThread.java:5001)
10-13 08:48:44.095: W/System.err(1049):     at java.lang.reflect.Method.invokeNative(Native Method)
10-13 08:48:44.095: W/System.err(1049):     at java.lang.reflect.Method.invoke(Method.java:515)
10-13 08:48:44.095: W/System.err(1049):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
10-13 08:48:44.095: W/System.err(1049):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
10-13 08:48:44.095: W/System.err(1049):     at dalvik.system.NativeStart.main(Native Method)
10-13 08:48:44.095: W/System.err(1049): org.jivesoftware.smack.SmackException$NotConnectedException: Client is not, or no longer, connected
10-13 08:48:44.155: W/System.err(1049):     at org.jivesoftware.smack.tcp.XMPPTCPConnection.throwNotConnectedExceptionIfAppropriate(XMPPTCPConnection.java:334)
10-13 08:48:44.155: W/System.err(1049):     at org.jivesoftware.smack.AbstractXMPPConnection.login(AbstractXMPPConnection.java:447)
10-13 08:48:44.165: W/System.err(1049):     at org.jivesoftware.smack.AbstractXMPPConnection.login(AbstractXMPPConnection.java:410)
10-13 08:48:44.165: W/System.err(1049):     at com.example.pm707.MainActivity.onCreate(MainActivity.java:39)
10-13 08:48:44.165: W/System.err(1049):     at android.app.Activity.performCreate(Activity.java:5231)
10-13 08:48:44.165: W/System.err(1049):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
10-13 08:48:44.165: W/System.err(1049):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2148)
10-13 08:48:44.165: W/System.err(1049):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2233)
10-13 08:48:44.175: W/System.err(1049):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
10-13 08:48:44.175: W/System.err(1049):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
10-13 08:48:44.185: W/System.err(1049):     at android.os.Handler.dispatchMessage(Handler.java:102)
10-13 08:48:44.185: W/System.err(1049):     at android.os.Looper.loop(Looper.java:136)
10-13 08:48:44.185: W/System.err(1049):     at android.app.ActivityThread.main(ActivityThread.java:5001)
10-13 08:48:44.185: W/System.err(1049):     at java.lang.reflect.Method.invokeNative(Native Method)
10-13 08:48:44.185: W/System.err(1049):     at java.lang.reflect.Method.invoke(Method.java:515)
10-13 08:48:44.185: W/System.err(1049):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
10-13 08:48:44.185: W/System.err(1049):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
10-13 08:48:44.185: W/System.err(1049):     at dalvik.system.NativeStart.main(Native Method)
10-13 08:48:44.355: D/(1049): HostConnection::get() New Host Connection established 0xb8104c50, tid 1049
10-13 08:48:44.415: W/EGL_emulation(1049): eglSurfaceAttrib not implemented

Would be grateful for any ideas for resolving this

Does this help? [http://stackoverflow.com/a/30568982/4791726](http://stackoverflow.com/a/30568982/4791726) — AlbAtNf, Oct 12 '15 at 11:32

score 0 · Answer 1 · answered Oct 12 '15 at 12:19

Smack jars should be available to application in runtime, but android.jar - already present on every android device and should be accessible only to compiler in compile time. NoClassDefFoundError indicates that app can not find smack libraries as they are not included in your target apk, so the problem is in your build configuration.

score 0 · Answer 2 · edited May 23 '17 at 12:03

0

The problem has been resolved as follows. All smack jars were physically removed from all libraries. Then I looked at this previous answer on How to use Smack 4.1 on Android This lead me to Smack Readme and Upgrade Guide. i downloaded the python3 file, created the artifact.csv file as explained and ran the python3 script. This installed all the smack 4.1 stuff in my project folder.

The program is still not working because of other errors, but this problem of NoClassDefFound is resolved.

edited May 23 '17 at 12:03

Community

1
1

answered Oct 13 '15 at 03:00

Calcutta

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The second problem was addressed by using an AsyncTask ... because Android does not allow networking operations from main thread – Calcutta Oct 14 '15 at 02:54

Very Simple XMPP client in Android

2 Answers2