Retrofit 2 HTTP method annotation is required (e.g., @GET, @POST, etc.)

Question

What's wrong with my Retrofit configuration? I'm having this error when I'm adding Basic Authentication with my OkHttpClient but when I used the default client without Interceptor it's working. Or is there something wrong with my Gradle Dependencies..?

E/AndroidRuntime﹕ FATAL EXCEPTION: main
        java.lang.IllegalArgumentException
    : HTTP method annotation is required (e.g., @GET, @POST, etc.).
            for method APIService.getRegAccrDetails
                    at retrofit.Utils.methodError(Utils.java:177)
                    at retrofit.Utils.methodError(Utils.java:167)
                    at retrofit.RequestFactoryParser.parseMethodAnnotations(RequestFactoryParser.java:135)
                    at retrofit.RequestFactoryParser.parse(RequestFactoryParser.java:59)
                    at retrofit.MethodHandler.create(MethodHandler.java:30)
                    at retrofit.Retrofit.loadMethodHandler(Retrofit.java:151)
                    at retrofit.Retrofit$1.invoke(Retrofit.java:132)
                    at $Proxy0.getRegAccrDetails(Native Method)
                    at alvin.test.myapplication.MainActivity.liferayAccess(MainActivity.java:136)
                    at alvin.test.myapplication.MainActivity.access$000(MainActivity.java:28)
                    at alvin.test.myapplication.MainActivity$1.onClick(MainActivity.java:49)
                    at android.view.View.performClick(View.java:3511)
                    at android.view.View$PerformClick.run(View.java:14105)
                    at android.os.Handler.handleCallback(Handler.java:605)
                    at android.os.Handler.dispatchMessage(Handler.java:92)
                    at android.os.Looper.loop(Looper.java:137)
                    at android.app.ActivityThread.main(ActivityThread.java:4424)
                    at java.lang.reflect.Method.invokeNative(Native Method)
                    at java.lang.reflect.Method.invoke(Method.java:511)
                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
                    at dalvik.system.NativeStart.main(Native Method)

Here is my API Service to be called

  @GET("Triu-services-portlet.regaccrdetails/get-all-reg-accr-details-by-num-branch-code/num/{num}/branch-code/{branch-code}")
    public Observable<List<RegAccrDetails>> getRegAccrDetails(@Path("num") String num, @Path("branch-code")String branchCode);

My OkHttpClient Interceptor

private static OkHttpClient createOkHttpClient() {
   String username = "[email protected]";
   String password = "TEST";
   String credentials = username + ":" + password;
   final String basic =
           "Basic " + Base64.encodeToString(credentials.getBytes(), Base64.DEFAULT);//no_wrap



    OkHttpClient client = new OkHttpClient();
    client.interceptors().add(new Interceptor() {
        @Override
        public Response intercept(Chain chain) throws IOException {
            Response response = chain.proceed(chain.request());

            Request original = chain.request();

            // Customize the request
            Request request = original.newBuilder()
                    .header("Authorization", basic)
                    .header("Accept", "application/json")
                    //.header("Authorization", "auth-token")//add token for service A4oslsSXZxfbLdk
                    .method(original.method(), original.body())
                    .build();

            response = chain.proceed(request);

            // Customize or return the response
            return response;
        }
    });

   return client;
}

Here is my Call for my API

private void liferayAccess(){
    Log.d("liferayAccess", "Entered");
    APIService service =  ServiceGenerator.createService(APIService.class);
    Observable<List<RegAccrDetails>> liferayResponse = service.getRegAccrDetails("004589209", "001");

    liferayResponse.subscribeOn(Schedulers.newThread()).map(listResponse -> "response index 0 " + listResponse.get(0).getRegNum())
            .subscribe( response-> Log.d("Liferay Num", response),
                        error -> Log.d("Error", error.toString())
                    );
}

Here is my Gradle Dependencies

 compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:23.1.1'

compile 'io.reactivex:rxjava:1.0.16'
compile 'io.reactivex:rxandroid:1.1.0'
compile 'com.squareup.retrofit:adapter-rxjava:2.0.0-beta2'
compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'

//compile 'com.squareup.retrofit:converter-simplexml:2.0.0-beta2'
/*compile 'com.squareup.okhttp:okhttp:2.2.0'*/
compile ('com.squareup.retrofit2:retrofit:2.0.0-beta3') {//com.squareup.retrofit2:retrofit:2.0.0-beta3
    // exclude Retrofit’s OkHttp peer-dependency module and define your own module import
    //exclude module: 'okhttp'
}
compile 'com.squareup.okhttp3:okhttp:3.0.0'
compile 'com.squareup.okhttp3:logging-interceptor:3.0.1'

Here is my App Gradle File

apply plugin: 'com.android.application'
apply plugin: 'me.tatarka.retrolambda'
android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    packagingOptions {
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/NOTICE'
    }




    defaultConfig {
        applicationId "alvin.test.myapplication"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.1.1'

    compile 'io.reactivex:rxjava:1.0.16'
    compile 'io.reactivex:rxandroid:1.1.0'
    compile 'com.squareup.retrofit:adapter-rxjava:2.0.0-beta2'
    compile 'com.squareup.retrofit:converter-gson:2.0.0-beta2'

    //compile 'com.squareup.retrofit:converter-simplexml:2.0.0-beta2'
    /*compile 'com.squareup.okhttp:okhttp:2.2.0'*/
    compile ('com.squareup.retrofit2:retrofit:2.0.0-beta3') {//com.squareup.retrofit2:retrofit:2.0.0-beta3
        // exclude Retrofit’s OkHttp peer-dependency module and define your own module import
        //exclude module: 'okhttp'
    }
    compile 'com.squareup.okhttp3:okhttp:3.0.0'
    compile 'com.squareup.okhttp3:logging-interceptor:3.0.1'

    //compile 'com.squareup.retrofit:retrofit:2.0.0-beta2'
    compile 'com.google.android.gms:play-services-gcm:7.3.0'
    compile 'com.google.android.gms:play-services:7.8.0'
}
retrolambda {
    jdk "C:\\Program Files\\Java\\jdk1.8.0_20"
}

My Proguard. I also tried add and remove it but same error log happen

-keepattributes *Annotation*
-keep class retrofit.** { *; }
-keepclasseswithmembers class * {
@retrofit.http.* <methods>; }
-keepattributes Signature


-keep class com.google.gson.** { *; }
-keep class com.google.inject.** { *; }
-keep class org.apache.http.** { *; }
-keep class org.apache.james.mime4j.** { *; }
-keep class javax.inject.** { *; }
-keep class retrofit.** { *; }

Answer 1

Using the wrong "@GET"

This may help someone coming from retrofit1, I was getting this same error and the fix was simple. In my interface I was unaware that I was using @GET from retrofit.http and not @GET from retrofit2.http, changing the annotation from retrofit.http to retrofit2.http was all I needed to do.

Answer 2

Issue

You're using beta2 versions of retrofit plugins which depend on beta2 version of retrofit which still lives in com.squreup.retrofit package.

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

Then you're importing beta3 version of retrofit itself which lives in retrofit2 package. Basically it can be used alongside beta2 version.

compile 'com.squareup.retrofit2:retrofit:2.0.0-beta3'

You're not really using beta3 at all, because it's incompatible with beta2 plugins and you'd get compile time errors. Check your imports to verify.

What happened is (most likely) you use everything from com.square.retrofit package except for the @GET class which is from retrofit2 package. Despite their identical name these classes are not the same.

Solution

Move to beta4 and retrofit2 package. Fix your imports. Profit.

compile 'com.squareup.retrofit2:retrofit:2.0.0-beta4'
compile 'com.squareup.retrofit2:adapter-rxjava:2.0.0-beta4'
compile 'com.squareup.retrofit2:converter-gson:2.0.0-beta4'

Answer 3

It look like you are using proguard and it is stripping annotations. To get saved from it add this lines to your proguard-rules.pro

-keepattributes *Annotation*
-keep class retrofit.** { *; }
-keepclasseswithmembers class * {
@retrofit.http.* <methods>; }
-keepattributes Signature

if not using proguard make sure that you havn't written something in your app build.gradle something like this

buildTypes {
    release {
        minifyEnabled true
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}

Note: Android does not come normally with many of the javax.annotation library by default.

if it is not so then try adding this in your gradle dependency (build.gradle)

provided 'org.glassfish:javax.annotation:10.0-b28'