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The observed return type must be parameterized as Observed <Foo> or Observable <? extends foo>

I am using retrofit 2.0.0-beta2 and the debug build works fine, but I get the following error in the release build using Proguard.

Logcat errors are updated here.

11-17 18:23:22.751 16274-16274/ph.reggis.FEDT D/AndroidRuntime: Shutting down VM 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: FATAL EXCEPTION: main 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: Process: ph.reggis.FEDT, PID: 16274 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: java.lang.RuntimeException: Unable to resume activity {ph.reggis.FEDT/ph.reggis.FEDT.view.activity.NotificationListActivity}: java.lang.IllegalArgumentException: Unable to create call adapter for class ba 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: for method InsularFMService.getNews 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3103) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:3134) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2481) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.app.ActivityThread.-wrap11(ActivityThread.java) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:102) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.os.Looper.loop(Looper.java:148) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5417) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: Caused by: java.lang.IllegalArgumentException: Unable to create call adapter for class ba 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: for method InsularFMService.getNews 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at retrofit.Utils.methodError(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at retrofit.MethodHandler.createCallAdapter(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at retrofit.MethodHandler.create(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at retrofit.Retrofit.loadMethodHandler(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at retrofit.Retrofit$1.invoke(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at java.lang.reflect.Proxy.invoke(Proxy.java:393) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at $Proxy0.getNews(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at ph.reggis.FEDT.bCd(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at ph.reggis.FEDT.view.fragment.NotificationListFragment.t(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at ph.reggis.FEDT.view.fragment.NotificationListFragment.l(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.support.v4.bBa(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.support.v4.bBa(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.support.v4.bBa(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.support.v4.bBi(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.support.v4.byi(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.support.v4.btonPostResume(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.support.v7.aBonPostResume(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.app.Activity.performResume(Activity.java:6336) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at android.app.ActivityThread.performResumeActivity(ActivityThread.java:3092) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: Caused by: java.lang.IllegalStateException: Observable return type must be parameterized as Observable<Foo> or Observable<? extends Foo> 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at retrofit.RxJavaCallAdapterFactory.get(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at retrofit.Retrofit.nextCallAdapter(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: at retrofit.Retrofit.callAdapter(Unknown Source) 11-17 18:23:22.752 16274-16274/ph.reggis.FEDT E/AndroidRuntime: ... 28 more

Interface:

 @GET("news") Observable<News> getNews();

Fragment:

 Retrofit retrofit = new Retrofit.Builder() .baseUrl(Constant.WS_URL_BASE) .addConverterFactory(GsonConverterFactory.create()) .addCallAdapterFactory(RxJavaCallAdapterFactory.create()) .build(); InsularFMService fmService = retrofit.create(InsularFMService.class); //Observable<News> observable = fmService.getNews(); //subscription = observable. - ALSO NOT WORKING subscription = fmService.getNews(). .observeOn(AndroidSchedulers.mainThread()) .subscribeOn(appController.getDefaultScheduler()) .subscribe(new Subscriber<News>() {...

Graddle:

 compile "com.squareup.retrofit:retrofit:2.0.0-beta2" compile "com.squareup.retrofit:converter-gson:2.0.0-beta2" compile "com.squareup.retrofit:adapter-rxjava:2.0.0-beta2"

Proguard:

 # Fixed: Caused by: java.lang.NoSuchFieldException: No field producerIndex -keepclassmembers class rx.internal.util.unsafe.*ArrayQueue*Field* { long producerIndex; long consumerIndex; } -keepclassmembers class rx.internal.util.unsafe.BaseLinkedQueueProducerNodeRef { long producerNode; long consumerNode; }
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Now it works by putting these attributes in Proguard.

 # Application classes that will be serialized/deserialized over Gson -keep class ph.reggis.FEDT.model.api.** { *; }

Here are the full settings

 ##---------------Begin: proguard configuration for Gson ---------- # Gson uses generic type information stored in a class file when working with fields. Proguard # removes such information by default, so configure it to keep all of it. -keepattributes Signature -keepattributes *Annotation* # Gson specific classes -keep class sun.misc.Unsafe { *; } # Application classes that will be serialized/deserialized over Gson -keep class ph.reggis.FEDT.model.api.** { *; } ##---------------End: proguard configuration for Gson ----------
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Source: https://habr.com/ru/post/1236138/

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