Program: 170612
Project: 170612
Buggy source:
private void initListener(){
  this.mListener=new ChangeListener();
  RetrofitUrlManager.getInstance().registerUrlChangeListener(mListener);
  findViewById(R.id.bt_request1).setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      HttpUrl url=RetrofitUrlManager.getInstance().fetchDomain(GITHUB_DOMAIN_NAME);
      if (url == null || !url.equals(HttpUrl.parse(mUrl1.getText().toString()))) {
        RetrofitUrlManager.getInstance().putDomain(GITHUB_DOMAIN_NAME,mUrl1.getText().toString());
      }
      NetWorkManager.getInstance().getOneApiService().getUsers(1,10).subscribeOn(Schedulers.io()).doOnSubscribe(new Consumer<Disposable>(){
        @Override public void accept(        Disposable disposable) throws Exception {
          mProgressDialog.show();
        }
      }
).subscribeOn(AndroidSchedulers.mainThread()).observeOn(AndroidSchedulers.mainThread()).doAfterTerminate(new Action(){
        @Override public void run() throws Exception {
          mProgressDialog.dismiss();
        }
      }
).subscribe(new Consumer<ResponseBody>(){
        @Override public void accept(        ResponseBody response) throws Exception {
          String string=response.string();
          Log.d("String_Node_Str",string);
          mDisplay.setText(string);
        }
      }
,new Consumer<Throwable>(){
        @Override public void accept(        Throwable throwable) throws Exception {
          throwable.printStackTrace();
          mDisplay.setText(throwable.getMessage());
        }
      }
);
    }
  }
);
  findViewById(R.id.bt_request2).setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      HttpUrl url=RetrofitUrlManager.getInstance().fetchDomain(GANK_DOMAIN_NAME);
      if (url == null || !url.equals(HttpUrl.parse(mUrl2.getText().toString()))) {
        RetrofitUrlManager.getInstance().putDomain(GANK_DOMAIN_NAME,mUrl2.getText().toString());
      }
      NetWorkManager.getInstance().getTwoApiService().getData(10,1).subscribeOn(Schedulers.io()).doOnSubscribe(new Consumer<Disposable>(){
        @Override public void accept(        Disposable disposable) throws Exception {
          mProgressDialog.show();
        }
      }
).subscribeOn(AndroidSchedulers.mainThread()).observeOn(AndroidSchedulers.mainThread()).doAfterTerminate(new Action(){
        @Override public void run() throws Exception {
          mProgressDialog.dismiss();
        }
      }
).subscribe(new Consumer<ResponseBody>(){
        @Override public void accept(        ResponseBody response) throws Exception {
          String string=response.string();
          Log.d("String_Node_Str",string);
          mDisplay.setText(string);
        }
      }
,new Consumer<Throwable>(){
        @Override public void accept(        Throwable throwable) throws Exception {
          throwable.printStackTrace();
          mDisplay.setText(throwable.getMessage());
        }
      }
);
    }
  }
);
  findViewById(R.id.bt_request3).setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      HttpUrl url=RetrofitUrlManager.getInstance().fetchDomain(GANK_DOMAIN_NAME);
      if (url == null || !url.equals(HttpUrl.parse(mUrl3.getText().toString()))) {
        RetrofitUrlManager.getInstance().putDomain(DOUBAN_DOMAIN_NAME,mUrl3.getText().toString());
      }
      NetWorkManager.getInstance().getThreeApiService().getBook(1220562).subscribeOn(Schedulers.io()).doOnSubscribe(new Consumer<Disposable>(){
        @Override public void accept(        Disposable disposable) throws Exception {
          mProgressDialog.show();
        }
      }
).subscribeOn(AndroidSchedulers.mainThread()).observeOn(AndroidSchedulers.mainThread()).doAfterTerminate(new Action(){
        @Override public void run() throws Exception {
          mProgressDialog.dismiss();
        }
      }
).subscribe(new Consumer<ResponseBody>(){
        @Override public void accept(        ResponseBody response) throws Exception {
          String string=response.string();
          Log.d("String_Node_Str",string);
          mDisplay.setText(string);
        }
      }
,new Consumer<Throwable>(){
        @Override public void accept(        Throwable throwable) throws Exception {
          throwable.printStackTrace();
          mDisplay.setText(throwable.getMessage());
        }
      }
);
    }
  }
);
}

Fixed version (ground truth):
private void initListener(){
  this.mListener=new ChangeListener();
  RetrofitUrlManager.getInstance().registerUrlChangeListener(mListener);
  findViewById(R.id.bt_request1).setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      DomainHolder holder=RetrofitUrlManager.getInstance().fetchDomain(GITHUB_DOMAIN_NAME);
      if (holder == null || !holder.getUrlStr().equals(mUrl1.getText().toString())) {
        RetrofitUrlManager.getInstance().putDomain(GITHUB_DOMAIN_NAME,mUrl1.getText().toString());
      }
      NetWorkManager.getInstance().getOneApiService().getUsers(1,10).subscribeOn(Schedulers.io()).doOnSubscribe(new Consumer<Disposable>(){
        @Override public void accept(        Disposable disposable) throws Exception {
          mProgressDialog.show();
        }
      }
).subscribeOn(AndroidSchedulers.mainThread()).observeOn(AndroidSchedulers.mainThread()).doAfterTerminate(new Action(){
        @Override public void run() throws Exception {
          mProgressDialog.dismiss();
        }
      }
).subscribe(new Consumer<ResponseBody>(){
        @Override public void accept(        ResponseBody response) throws Exception {
          String string=response.string();
          Log.d("String_Node_Str",string);
          mDisplay.setText(string);
        }
      }
,new Consumer<Throwable>(){
        @Override public void accept(        Throwable throwable) throws Exception {
          throwable.printStackTrace();
          mDisplay.setText(throwable.getMessage());
        }
      }
);
    }
  }
);
  findViewById(R.id.bt_request2).setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      DomainHolder holder=RetrofitUrlManager.getInstance().fetchDomain(GANK_DOMAIN_NAME);
      if (holder == null || !holder.getUrlStr().equals(mUrl2.getText().toString())) {
        RetrofitUrlManager.getInstance().putDomain(GANK_DOMAIN_NAME,mUrl2.getText().toString());
      }
      NetWorkManager.getInstance().getTwoApiService().getData(10,1).subscribeOn(Schedulers.io()).doOnSubscribe(new Consumer<Disposable>(){
        @Override public void accept(        Disposable disposable) throws Exception {
          mProgressDialog.show();
        }
      }
).subscribeOn(AndroidSchedulers.mainThread()).observeOn(AndroidSchedulers.mainThread()).doAfterTerminate(new Action(){
        @Override public void run() throws Exception {
          mProgressDialog.dismiss();
        }
      }
).subscribe(new Consumer<ResponseBody>(){
        @Override public void accept(        ResponseBody response) throws Exception {
          String string=response.string();
          Log.d("String_Node_Str",string);
          mDisplay.setText(string);
        }
      }
,new Consumer<Throwable>(){
        @Override public void accept(        Throwable throwable) throws Exception {
          throwable.printStackTrace();
          mDisplay.setText(throwable.getMessage());
        }
      }
);
    }
  }
);
  findViewById(R.id.bt_request3).setOnClickListener(new View.OnClickListener(){
    @Override public void onClick(    View v){
      DomainHolder holder=RetrofitUrlManager.getInstance().fetchDomain(DOUBAN_DOMAIN_NAME);
      if (holder == null || !holder.getUrlStr().equals(mUrl3.getText().toString())) {
        RetrofitUrlManager.getInstance().putDomain(DOUBAN_DOMAIN_NAME,mUrl3.getText().toString());
      }
      NetWorkManager.getInstance().getThreeApiService().getBook(1220562).subscribeOn(Schedulers.io()).doOnSubscribe(new Consumer<Disposable>(){
        @Override public void accept(        Disposable disposable) throws Exception {
          mProgressDialog.show();
        }
      }
).subscribeOn(AndroidSchedulers.mainThread()).observeOn(AndroidSchedulers.mainThread()).doAfterTerminate(new Action(){
        @Override public void run() throws Exception {
          mProgressDialog.dismiss();
        }
      }
).subscribe(new Consumer<ResponseBody>(){
        @Override public void accept(        ResponseBody response) throws Exception {
          String string=response.string();
          Log.d("String_Node_Str",string);
          mDisplay.setText(string);
        }
      }
,new Consumer<Throwable>(){
        @Override public void accept(        Throwable throwable) throws Exception {
          throwable.printStackTrace();
          mDisplay.setText(throwable.getMessage());
        }
      }
);
    }
  }
);
}