Retrofit2: ClassCastException: java.util.ArrayList cannot be cast to retrofit2.Call
问题 please help with Retrofit2. I'm very new in Retrofit. I create simple server application. The application manage list of Journals: add Journal in the in-memory list and return Journal by id. There is an Journal.java: public class Journal { private AtomicInteger getNewId = new AtomicInteger(0); @SerializedName("id") @Expose private Integer id; @SerializedName("name") @Expose private String name; public Journal(String name) { this.id = getNewId.incrementAndGet(); this.name = name;} public