Fix to rollback action version endpoint (#370)

src/main/java/com/auth0/client/mgmt/ActionsEntity.java

@@ -11,7 +11,9 @@
 import com.auth0.utils.Asserts;
 import com.fasterxml.jackson.core.type.TypeReference;
 import okhttp3.HttpUrl;
+import okhttp3.MediaType;
 import okhttp3.OkHttpClient;
+import okhttp3.RequestBody;
 
 /**
  * Class that provides an implementation of the Actions methods of the Management API as defined in https://auth0.com/docs/api/management/v2#!/Actions
@@ -266,7 +268,8 @@ public Request<Version> rollBackToVersion(String actionId, String actionVersionI
             .build()
             .toString();
 
-        EmptyBodyRequest<Version> request = new EmptyBodyRequest<>(client, url, "POST", new TypeReference<Version>() {
+        // Needed to successfully call the roll-back endpoint until DXEX-1738 is resolved.
+        EmptyObjectRequest<Version> request = new EmptyObjectRequest<>(client, url, "POST", new TypeReference<Version>() {
         });
 
         request.addHeader(AUTHORIZATION_HEADER, "Bearer " + apiToken);
@@ -428,4 +431,20 @@ private void applyFilter(BaseFilter filter, HttpUrl.Builder builder) {
             filter.getAsMap().forEach((k, v) -> builder.addQueryParameter(k, String.valueOf(v)));
         }
     }
+
+    // Temporary request implementation to send an empty json object on the request body.
+    private static class EmptyObjectRequest<T> extends EmptyBodyRequest<T> {
+        EmptyObjectRequest(OkHttpClient client, String url, String method, TypeReference<T> tType) {
+            super(client, url, method, tType);
+        }
+
+        @Override
+        @SuppressWarnings("deprecation")
+        protected RequestBody createRequestBody() {
+            // Use OkHttp v3 signature to ensure binary compatibility between v3 and v4
+            // https://github.com/auth0/auth0-java/issues/324
+            return RequestBody.create(MediaType.parse("application/json"), "{}".getBytes());
+        }
+
+    }
 }

src/test/java/com/auth0/client/mgmt/ActionsEntityTest.java

@@ -11,6 +11,7 @@
 import java.util.*;
 
 import static com.auth0.client.MockServer.bodyFromRequest;
+import static com.auth0.client.MockServer.readFromRequest;
 import static com.auth0.client.RecordedRequestMatcher.*;
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
@@ -304,7 +305,7 @@ public void shouldRollBackActionVersion() throws Exception {
         assertThat(recordedRequest, hasHeader("Content-Type", "application/json"));
         assertThat(recordedRequest, hasHeader("Authorization", "Bearer apiToken"));
         assertThat(recordedRequest.getBody(), is(notNullValue()));
-        assertThat(recordedRequest.getBody().size(), is(0L));
+        assertThat(readFromRequest(recordedRequest), is("{}"));
 
         assertThat(response, is(notNullValue()));
     }