android - java.lang.NoClassDefFoundError: org.apache.commons.net.ftp.FTPClient -


i'm trying upload image ftp server using asynctask:

import android.content.context; import android.os.asynctask; import org.apache.commons.net.ftp.ftp; import org.apache.commons.net.ftp.ftpclient; import org.apache.commons.net.ftp.ftpreply; import java.io.fileinputstream;  public class my_ftp_uploader extends asynctask<string, void, string> {  public string file_name; private context context; public ftpclient mftpclient = null;  public my_ftp_uploader(context context) {     this.context = context; }  protected void onpreexecute() {  }  @override protected string doinbackground(string... arg0) {     string filestouploadpath = arg0[0];     file_name = arg0[1];      try {         mftpclient = new ftpclient();          mftpclient.connect("my_domain", 21);          if (ftpreply.ispositivecompletion(mftpclient.getreplycode())) {             boolean status = mftpclient.login("my_domain", "my_password");              mftpclient.setfiletype(ftp.binary_file_type);             mftpclient.enterlocalpassivemode();             try {                 fileinputstream srcfilestream = new fileinputstream(filestouploadpath);                  try {                     mftpclient.changeworkingdirectory("myserver_path");                     status = mftpclient.storefile(file_name + ".jpg", srcfilestream);                     try {                         mftpclient.logout();                         mftpclient.disconnect();                     } catch (exception e) {                     }                 } catch(exception e) {                 }                  srcfilestream.close();             } catch (exception e) {             }          }     } catch(exception e) {      }      return "done"; }  @override protected void onpostexecute(string result) {   }  }

however, receive topic error. here gradle:

apply plugin: 'com.android.application'  android {  configurations.all {     resolutionstrategy {         force 'com.android.support:support-v4:23.+'         force 'com.android.support:appcompat-v7:23.+'         force 'com.android.support:recyclerview-v7:23.+'     } } compilesdkversion 23 buildtoolsversion "23.0.2"  defaultconfig {     applicationid "my_app_id"     minsdkversion 15     targetsdkversion 15     versioncode 1     versionname "1.0"     multidexenabled true } buildtypes {     release {         minifyenabled false         proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'     } } }  dependencies { compile filetree(dir: 'libs', include: ['*.jar']) testcompile 'junit:junit:4.12' compile 'com.android.support:appcompat-v7:23.1.1' compile 'com.android.support:design:23.1.1' compile 'com.android.support:support-v4:23.1.1' compile 'com.nononsenseapps:filepicker:3.0.0' compile 'com.google.android.gms:play-services:8.4.0' compile 'com.squareup.okhttp3:okhttp:3.4.1' compile 'com.daimajia.swipelayout:library:1.2.0@aar' compile 'net.gotev:uploadservice:3.0' compile 'com.jakewharton:butterknife:7.0.1' compile 'net.gotev:uploadservice-ftp:3.0' compile 'com.github.bumptech.glide:glide:3.7.0' }  repositories { jcenter() }

logical points below line source of error:

mftpclient = new ftpclient();

p.s, asynctask worked before. stops working telling error. guess did conflicts else! problem since finished part, did many things on app , don't know 1 can cause it! had on similar topics did not me. hint appreciated.

i think missing in build file

compile group: 'commons-net', name: 'commons-net', version: '2.0'

to make apache commons included in project


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