Android Runtime Error "java.lang.NoClassDefFoundError: org.apache.commons.collections.CollectionUtils "
<p>I am trying to use org.apache.commons.collections.CollectionUtils in Android. The sample is below </p>

<pre><code>import java.util.ArrayList;

import org.apache.commons.collections.CollectionUtils;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;

public class CheckCommonsActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    String email1 = "xyz@gmail.com";
    String email2 = "abc@gmail.com";
    String email3 = "mnp@gmail.com";
    String email4 = null;       

    ArrayList&lt;String&gt; emailList1 = new ArrayList&lt;String&gt;();
    emailList1.add(email4);
    emailList1.add(email1);
    emailList1.add(email2);
    emailList1.add(email3);

    ArrayList&lt;String&gt; emailList2 = new ArrayList&lt;String&gt;();
    emailList2.add(email3);
    emailList2.add(email2);
    emailList2.add(email1);

    boolean isEqual = CollectionUtils.isEqualCollection(emailList1,
 emailList2);
    TextView text = (TextView) findViewById(R.id.text);
    text.setText(String.valueOf(isEqual));
   }
 }
</code></pre>

<p>I have imported commons-collections-3.2.1.jar to Build Path of Android Project, but I am getting error <code>java.lang.NoClassDefFoundError: org.apache.commons.collections.CollectionUtils</code> at runtime.</p>

<p><strong>Edit1</strong></p>

<p><img src="http://i.stack.imgur.com/xyy0U.jpg" alt="Android Project Artifact"></p>

<p>Thanks</p>
