diff --git a/src/main/java/com/example/springdemo/dao/MerchantsRepository.java b/src/main/java/com/example/springdemo/dao/MerchantsRepository.java
index 82350ae..640663a 100644
--- a/src/main/java/com/example/springdemo/dao/MerchantsRepository.java
+++ b/src/main/java/com/example/springdemo/dao/MerchantsRepository.java
@@ -1,15 +1,14 @@
 package com.example.springdemo.dao;
 
 import com.example.springdemo.entities.Merchants;
+import org.jetbrains.annotations.NotNull;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
 import java.util.List;
 
 @Repository
-
 public interface MerchantsRepository extends JpaRepository<Merchants, Long> {
     List<Merchants> findByName(String name);
-
-    void deleteById(Long id);
+    void deleteById(@NotNull Long id);
 }
diff --git a/src/main/java/com/example/springdemo/dao/package-info.java b/src/main/java/com/example/springdemo/dao/package-info.java
deleted file mode 100644
index be53987..0000000
--- a/src/main/java/com/example/springdemo/dao/package-info.java
+++ /dev/null
@@ -1,4 +0,0 @@
-@NonNullApi
-package com.example.springdemo.dao;
-
-import org.springframework.lang.NonNullApi;
\ No newline at end of file