Unable to create converter for my class in Android Retrofit2 converter-simplexml library

Question

Im using Retrofit2 converter-simplexml library,the code run successful when I using converter-gson,but when I add simplexmlConverter,I got a exception:

java.lang.IllegalArgumentException: Unable to create converter for java.util.List<com.rengwuxian.rxjavasamples.model.ZhuangbiImage>
Caused by: java.lang.IllegalArgumentException: Could not locate ResponseBody converter for java.util.List<com.rengwuxian.rxjavasamples.model.ZhuangbiImage>.

This is where I am trying to execute the retro http request:

private void search(String key) {
    subscription = getZhuangbiApi()
            .search(key)
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .subscribe(observer);
}

public static ZhuangbiApi getZhuangbiApi() {
    if (zhuangbiApi == null) {
        Retrofit retrofit = new Retrofit.Builder()
                .client(okHttpClient)
                .baseUrl(baseUrl)
                .addConverterFactory(simpleXmlConverterFactory)
                .addCallAdapterFactory(rxJavaCallAdapterFactory)
                .build();
        zhuangbiApi = retrofit.create(ZhuangbiApi.class);

    }
    return zhuangbiApi;
}

My interface which turned to be my API

public interface ZhuangbiApi {

@GET("merchant/list")
Observable<List<ZhuangbiImage>> search(@Query("app_code") String appCode);
}

And the ZhuangbiImage class

@Root(name = "item")
public class ZhuangbiImage {

@Element(name = "title")
public String title;

@Element(name = "merchant_id")
public String merchantId;
}

Answer 1

XML can only be deserialized to a concrete type and not a list of types like JSON. In this case, the body type should represent the <rss> tag and its children and not List<ZhuangbiImage>.

More details from official retrofit team Retrofit, XML and SimpleXmlConverterFactory problem