Program: 86135
Project: 86135
Buggy source:
public void download(final String a){
}

Fixed version (ground truth):
public void download(final String a){
  MultiStepResultHelper<String> msrhDownload=new MultiStepResultHelper<>(getActivity(),a,R.string.doing_download);
  msrhDownload.setCallback(new Callback<String>(){
    @Override public void onSuccess(    MultiStepResult res){
      final EbookServiceApi.DownloadResult result=(EbookServiceApi.DownloadResult)res;
      if (result.getUrl() != null) {
        if (result.getUrl().contains("String_Node_Str")) {
          String[] download_clients=new String[]{"String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str","String_Node_Str"};
          boolean found=false;
          PackageManager pm=getActivity().getPackageManager();
          for (          String id : download_clients) {
            try {
              pm.getPackageInfo(id,0);
              found=true;
            }
 catch (            NameNotFoundException e) {
            }
          }
          final SharedPreferences sp=PreferenceManager.getDefaultSharedPreferences(getActivity());
          if (!found && !sp.contains("String_Node_Str")) {
            int msg=R.string.reader_needed;
            if (result.getUrl().toLowerCase().contains("String_Node_Str")) {
              msg=R.string.reader_needed_overdrive;
            }
            AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
            builder.setMessage(msg).setCancelable(true).setNegativeButton(R.string.cancel,new DialogInterface.OnClickListener(){
              @Override public void onClick(              DialogInterface dialog,              int id){
                dialog.cancel();
              }
            }
).setNeutralButton(R.string.reader_needed_ignore,new DialogInterface.OnClickListener(){
              @Override public void onClick(              DialogInterface dialog,              int id){
                Intent i=new Intent(Intent.ACTION_VIEW);
                i.setData(Uri.parse(result.getUrl()));
                sp.edit().putBoolean("String_Node_Str",true).commit();
                startActivity(i);
              }
            }
).setPositiveButton(R.string.download,new DialogInterface.OnClickListener(){
              @Override public void onClick(              DialogInterface dialog,              int id){
                dialog.cancel();
                String reader="String_Node_Str";
                if (result.getUrl().toLowerCase().contains("String_Node_Str")) {
                  reader="String_Node_Str";
                }
                Intent i=new Intent(Intent.ACTION_VIEW,Uri.parse("String_Node_Str" + reader));
                startActivity(i);
              }
            }
);
            AlertDialog alert=builder.create();
            alert.show();
            return;
          }
        }
        Intent i=new Intent(Intent.ACTION_VIEW);
        i.setData(Uri.parse(result.getUrl()));
        startActivity(i);
      }
    }
    @Override public void onError(    MultiStepResult result){
      AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
      builder.setMessage(result.getMessage()).setCancelable(true).setNegativeButton(R.string.close,new DialogInterface.OnClickListener(){
        @Override public void onClick(        DialogInterface d,        int id){
          d.cancel();
        }
      }
).setOnCancelListener(new DialogInterface.OnCancelListener(){
        @Override public void onCancel(        DialogInterface d){
          if (d != null) {
            d.cancel();
          }
        }
      }
);
      AlertDialog alert=builder.create();
      alert.show();
    }
    @Override public void onUnhandledResult(    MultiStepResult result){
    }
    @Override public void onUserCancel(){
    }
    @Override public StepTask<?> newTask(    MultiStepResultHelper helper,    int useraction,    String selection,    String argument){
      return dt=new DownloadTask(helper,useraction,selection,argument);
    }
  }
);
  msrhDownload.start();
}