title: Caused by: java.lang.SecurityException: Can't make field constructor accessible
body: <p>I am having problem with ActiveAndroid while saving data.</p>
  
  <pre><code>import com.activeandroid.Model;
  import com.activeandroid.annotation.Column;
  import com.activeandroid.annotation.Table;
  import com.google.gson.annotations.SerializedName;
  
  @Table(name = "login_response")
  public class LoginResponse extends Model{
      @Column(name = "a_token")
      @SerializedName("access_token")
      public String mAccessToken;
  
      @Column(name = "expiry_time")
      @SerializedName("expires_in")
      public Long mExpiresIn;
  
      @Column(name = "refresh_token")
      @SerializedName("refresh_token")
      public String mRefreshToken;
  
  
      @Column(name = "scope")
      @SerializedName("scope")
      public String mScope;
  
      @Column(name = "token_type")
      @SerializedName("token_type")
      public String mTokenType;
  
      public LoginResponse(){}
  
      public String getAccessToken() {
          return mAccessToken;
      }
  
      public void setAccessToken(String accessToken) {
          mAccessToken = accessToken;
      }
  
      public Long getExpiresIn() {
          return mExpiresIn;
      }
  
      public void setExpiresIn(Long expiresIn) {
          mExpiresIn = expiresIn;
      }
  
      public String getRefreshToken() {
          return mRefreshToken;
      }
  
      public void setRefreshToken(String refreshToken) {
          mRefreshToken = refreshToken;
      }
  
      public String getScope() {
          return mScope;
      }
  
      public void setScope(String scope) {
          mScope = scope;
      }
  
      public String getTokenType() {
          return mTokenType;
      }
  
      public void setTokenType(String tokenType) {
          mTokenType = tokenType;
      }
  }
  </code></pre>
  
  <p>The above is the Mapping class for response obtained using retrofit while fetching data from web api.
  But I got and error like this.</p>
  
  <blockquote>
    <p>FATAL EXCEPTION: main
                                                     Process: com.bidhee.onlinepayment, PID: 3826
                                                     java.lang.IllegalArgumentException: Unable to create converter for
    class com.bidhee.onlinepayment.model.login.LoginResponse
                                                         for method LoginApi.getResponse
                                                         at retrofit2.ServiceMethod$Builder.methodError(ServiceMethod.java:695)
                                                         at retrofit2.ServiceMethod$Builder.createResponseConverter(ServiceMethod.java:681)
                                                         at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:166)
                                                         at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:166)
                                                         at retrofit2.Retrofit$1.invoke(Retrofit.java:145)
                                                         at java.lang.reflect.Proxy.invoke(Proxy.java:393)
                                                         at $Proxy2.getResponse(Unknown Source)
                                                         at com.bidhee.onlinepayment.ui.viewpresenter.login.LoginPresenterImpl.attemptLogin(LoginPresenterImpl.java:39)
                                                         at com.bidhee.onlinepayment.ui.viewpresenter.login.LoginRegisterActivity.onBtnSignInClicked(LoginRegisterActivity.java:93)
                                                         at com.bidhee.onlinepayment.ui.viewpresenter.login.LoginRegisterActivity$$ViewBinder$1.doClick(LoginRegisterActivity$$ViewBinder.java:23)
                                                         at butterknife.internal.DebouncingOnClickListener.onClick(DebouncingOnClickListener.java:22)
                                                         at android.view.View.performClick(View.java:5198)
                                                         at android.view.View$PerformClick.run(View.java:21147)
                                                         at android.os.Handler.handleCallback(Handler.java:739)
                                                         at android.os.Handler.dispatchMessage(Handler.java:95)
                                                         at android.os.Looper.loop(Looper.java:148)
                                                         at android.app.ActivityThread.main(ActivityThread.java:5417)
                                                         at java.lang.reflect.Method.invoke(Native Method)
                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
                                                      Caused by: java.lang.SecurityException: Can't make field constructor accessible
                                                         at java.lang.reflect.Constructor.setAccessible(Constructor.java:334)
                                                         at com.google.gson.internal.ConstructorConstructor.newDefaultConstructor(ConstructorConstructor.java:101)
                                                         at com.google.gson.internal.ConstructorConstructor.get(ConstructorConstructor.java:83)
                                                         at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:95)
                                                         at com.google.gson.Gson.getAdapter(Gson.java:416)
                                                         at com.google.gson.internal.bind.MapTypeAdapterFactory.getKeyAdapter(MapTypeAdapterFactory.java:140)
                                                         at com.google.gson.internal.bind.MapTypeAdapterFactory.create(MapTypeAdapterFactory.java:125)
                                                         at com.google.gson.Gson.getAdapter(Gson.java:416)
                                                         at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:135)
                                                         at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.(ReflectiveTypeAdapterFactory.java:105)
                                                         at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:104)
                                                         at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:160)
                                                         at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:96)
                                                         at com.google.gson.Gson.getAdapter(Gson.java:416)
                                                         at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getFieldAdapter(ReflectiveTypeAdapterFactory.java:135)
                                                         at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.(ReflectiveTypeAdapterFactory.java:105)
                                                         at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:104)
                                                         at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:160)
                                                         at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:96)
                                                         at com.google.gson.Gson.getAdapter(Gson.java:416)
                                                         at retrofit2.converter.gson.GsonConverterFactory.responseBodyConverter(GsonConverterFactory.java:63)
                                                         at retrofit2.Retrofit.nextResponseBodyConverter(Retrofit.java:325)
                                                         at retrofit2.Retrofit.responseBodyConverter(Retrofit.java:308)
                                                         at retrofit2.ServiceMethod$Builder.createResponseConverter(ServiceMethod.java:679)
                                                         at retrofit2.ServiceMethod$Builder.build(ServiceMethod.java:166) 
                                                         at retrofit2.Retrofit.loadServiceMethod(Retrofit.java:166) 
                                                         at retrofit2.Retrofit$1.invoke(Retrofit.java:145) 
                                                         at java.lang.reflect.Proxy.invoke(Proxy.java:393) 
                                                         at $Proxy2.getResponse(Unknown Source) 
                                                         at com.bidhee.onlinepayment.ui.viewpresenter.login.LoginPresenterImpl.attemptLogin(LoginPresenterImpl.java:39) 
                                                         at com.bidhee.onlinepayment.ui.viewpresenter.login.LoginRegisterActivity.onBtnSignInClicked(LoginRegisterActivity.java:93) 
                                                         at com.bidhee.onlinepayment.ui.viewpresenter.login.LoginRegisterActivity$$ViewBinder$1.doClick(LoginRegisterActivity$$ViewBinder.java:23) 
                                                         at butterknife.internal.DebouncingOnClickListener.onClick(DebouncingOnClickListener.java:22) 
                                                         at android.view.View.performClick(View.java:5198) 
                                                         at android.view.View$PerformClick.run(View.java:21147) 
                                                         at android.os.Handler.handleCallback(Handler.java:739) 
                                                         at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                         at android.os.Looper.loop(Looper.java:148) 
                                                         at android.app.ActivityThread.main(ActivityThread.java:5417) 
                                                         at java.lang.reflect.Method.invoke(Native Method) 
                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)</p>
  </blockquote>
  
  <p>It was working fine before ActiveAndroid But when I am trying to use Active android I got the above errors.
  I can same the manually created object of different class and save it but while using retrofit and active android I can't.</p>
  
  <p>I am using retrofit with the dependencies</p>
  
  <p><strong>compile 'com.squareup.retrofit2:retrofit:2.0.2'</strong></p>
  
  <p><strong>compile 'com.squareup.retrofit2:converter-gson:2.0.2'</strong></p>
  
  <p>This is how I am building the retrofit client</p>
  
  <pre><code>okhttpClientBuilder = new OkHttpClient.Builder();
          retrofitBuilder = new Retrofit.Builder();
  
          client = okhttpClientBuilder
                  .addInterceptor(new ApiInterceptor())
                  .build();
  
          retrofit = retrofitBuilder
                  .baseUrl(BuildConfig.BASE_URL)
                  .addConverterFactory(GsonConverterFactory.create())
                  .client(client)
                  .build();
  </code></pre>
  
  <p><strong>The way I am calling the api is</strong></p>
  
  <pre><code>Retrofit retrofit = OnlinePaymentApplication.getRetrofit();
          APIs.LoginApi api = retrofit.create(APIs.LoginApi.class);
          Call&lt;LoginResponse&gt; call = api.getResponse(grantType, clientId, clientSecret, userName, userPassword);
          call.enqueue(new Callback&lt;LoginResponse&gt;() {
              @Override
              public void onResponse(Call&lt;LoginResponse&gt; call, Response&lt;LoginResponse&gt; response) {
                  loginView.hideProgress();
  
                  if (response.isSuccessful()) {
                      loginView.onLoginDataReceived(response.body());
                  } else {
                      ErrorResponse error = ErrorUtils.parseError(response);
                      loginView.onErrorMessageReceived(error.getMessage());
                  }
              }
  
              @Override
              public void onFailure(Call&lt;LoginResponse&gt; call, Throwable t) {
                  loginView.hideProgress();
  
                  if (t instanceof IOException) {
                      loginView.onErrorMessageReceived(MetaData.NETWORK_ERROR);
                  } else {
                      loginView.onErrorMessageReceived(t.getLocalizedMessage());
                  }
  
              }
          });
  </code></pre>