diff --git a/jni/src/nmslib_wrapper.cpp b/jni/src/nmslib_wrapper.cpp
index 3301217364..14a2ed1543 100644
--- a/jni/src/nmslib_wrapper.cpp
+++ b/jni/src/nmslib_wrapper.cpp
@@ -283,6 +283,11 @@ void knn_jni::nmslib_wrapper::CreateIndex_With_Memory_Address(knn_jni::JNIUtilIn
                 topLevelPointer++;
             }
 
+//            for(int j = 0; j < dim ; j++) {
+//                std::cout<<floatArrayCpp[j]<<" ";
+//            }
+//            std::cout<<std::endl;
+
             memcpy(ptr, &floatArrayCpp, vectorSizeInBytes);
             //jniUtil->ReleaseFloatArrayElements(env, floatArrayJ, floatArrayCpp, JNI_ABORT);
             ptr += vectorSizeInBytes;
diff --git a/jni/src/org_opensearch_knn_jni_FaissService.cpp b/jni/src/org_opensearch_knn_jni_FaissService.cpp
index 1b79d91143..908d557a3e 100644
--- a/jni/src/org_opensearch_knn_jni_FaissService.cpp
+++ b/jni/src/org_opensearch_knn_jni_FaissService.cpp
@@ -144,7 +144,7 @@ JNIEXPORT jlong JNICALL Java_org_opensearch_knn_jni_FaissService_transferVectors
 
     int dim = jniUtil.GetInnerDimensionOf2dJavaFloatArray(env, vectorsJ);
     auto dataset = jniUtil.Convert2dJavaObjectArrayToCppFloatVector(env, vectorsJ, dim);
-    vect->insert(vect->begin(), dataset.begin(), dataset.end());
+    vect->insert(vect->end(), dataset.begin(), dataset.end());
 
     return (jlong) vect;
 }