diff --git a/sdk-tests/src/test/java/io/dapr/it/pubsub/http/PubSubIT.java b/sdk-tests/src/test/java/io/dapr/it/pubsub/http/PubSubIT.java
index 8e916b1b7..eadf416d7 100644
--- a/sdk-tests/src/test/java/io/dapr/it/pubsub/http/PubSubIT.java
+++ b/sdk-tests/src/test/java/io/dapr/it/pubsub/http/PubSubIT.java
@@ -10,7 +10,6 @@ import io.dapr.client.DaprClientBuilder;
 import io.dapr.client.domain.Verb;
 import io.dapr.it.BaseIT;
 import io.dapr.it.DaprRun;
-import io.dapr.serializer.DefaultObjectSerializer;
 import org.junit.Test;
 
 import java.util.Collections;
diff --git a/sdk/src/main/java/io/dapr/client/DaprClientHttp.java b/sdk/src/main/java/io/dapr/client/DaprClientHttp.java
index 28710ef56..0e79a3bd8 100644
--- a/sdk/src/main/java/io/dapr/client/DaprClientHttp.java
+++ b/sdk/src/main/java/io/dapr/client/DaprClientHttp.java
@@ -131,7 +131,7 @@ public class DaprClientHttp implements DaprClient {
       }
       String path = String.format("%s/%s/method/%s", Constants.INVOKE_PATH, appId, method);
       byte[] serializedRequestBody = objectSerializer.serialize(request);
-      Mono<DaprHttp.Response> response = this.client.invokeApi(httMethod, path, null, serializedRequestBody, metadata);
+      Mono<DaprHttp.Response> response = this.client.invokeApi(httMethod, path, metadata, serializedRequestBody, null);
       return response.flatMap(r -> {
         try {
           T object = objectSerializer.deserialize(r.getBody(), clazz);
diff --git a/sdk/src/test/java/io/dapr/runtime/DaprRuntimeTest.java b/sdk/src/test/java/io/dapr/runtime/DaprRuntimeTest.java
index c81635c1f..99e70c50c 100644
--- a/sdk/src/test/java/io/dapr/runtime/DaprRuntimeTest.java
+++ b/sdk/src/test/java/io/dapr/runtime/DaprRuntimeTest.java
@@ -113,7 +113,7 @@ public class DaprRuntimeTest {
       when(daprHttp.invokeApi(
           eq("POST"),
           eq(Constants.PUBLISH_PATH + "/" + TOPIC_NAME),
-          eq(null),
+          any(),
           eq(serializer.serialize(message.data)),
           eq(null)))
           .thenAnswer(invocationOnMock -> this.daprRuntime.handleInvocation(
@@ -200,9 +200,9 @@ public class DaprRuntimeTest {
       when(daprHttp.invokeApi(
           eq("POST"),
           eq(Constants.INVOKE_PATH + "/" + APP_ID + "/method/" + METHOD_NAME),
-          eq(null),
+          any(),
           eq(serializer.serialize(message.data)),
-          any()))
+          eq(null)))
           .thenAnswer(x ->
               this.daprRuntime.handleInvocation(
               METHOD_NAME,