Fix / Keysbackup not working

Regression after ParentRestClient refactoring, the retrofit converter has changed and is not able to serialize kotlin class (if no @JVMField is set)

Author: BillCarsonFr

CHANGES.rst

@@ -8,7 +8,7 @@ Improvements:
  -
 
 Bugfix:
- -
+ - Fix / Keysbackup not working (failed to get version)
 
 API Change:
  -

matrix-sdk-core/src/main/java/org/matrix/androidsdk/RestClient.java

@@ -100,7 +100,7 @@ public enum EndPointServer {
     private OkHttpClient mOkHttpClient;
 
     public RestClient(HomeServerConnectionConfig hsConfig, Class<T> type, String uriPrefix) {
-        this(hsConfig, type, uriPrefix, GsonProvider.provideGson(), EndPointServer.HOME_SERVER);
+        this(hsConfig, type, uriPrefix, GsonProvider.provideKotlinGson(), EndPointServer.HOME_SERVER);
     }
 
     public RestClient(HomeServerConnectionConfig hsConfig, Class<T> type, String uriPrefix, Gson gson) {

matrix-sdk-core/src/main/java/org/matrix/androidsdk/core/json/GsonProvider.java

@@ -35,4 +35,15 @@ public static Gson provideGson() {
         return gson;
     }
 
+    // Can serialize/deserialise kt objects without the need to add @JVMField
+    private static final Gson kotlinGson = new GsonBuilder()
+            .registerTypeAdapter(boolean.class, new BooleanDeserializer(false))
+            .registerTypeAdapter(Boolean.class, new BooleanDeserializer(true))
+            .create();
+
+    public static Gson provideKotlinGson() {
+        return kotlinGson;
+    }
+
+
 }

matrix-sdk/src/main/java/org/matrix/androidsdk/core/JsonUtils.java

@@ -70,11 +70,6 @@ public class JsonUtils {
 
     private static final Gson basicGson = new Gson();
 
-    private static final Gson kotlinGson = new GsonBuilder()
-            .registerTypeAdapter(boolean.class, new BooleanDeserializer(false))
-            .registerTypeAdapter(Boolean.class, new BooleanDeserializer(true))
-            .create();
-
     private static final Gson gson = new GsonBuilder()
             .setFieldNamingStrategy(new MatrixFieldNamingStrategy())
             .excludeFieldsWithModifiers(Modifier.PRIVATE, Modifier.STATIC)
@@ -104,15 +99,6 @@ public static Gson getBasicGson() {
         return basicGson;
     }
 
-    /**
-     * Provides the JSON parser for Kotlin.
-     *
-     * @return the kotlin JSON parser
-     */
-    public static Gson getKotlinGson() {
-        return kotlinGson;
-    }
-
     /**
      * Provides the JSON parser.
      *