src/main/java/com/example/demo/config/TransactionPolicyConfig.java

@@ -0,0 +1,14 @@
+package com.example.demo.config;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.transaction.annotation.EnableTransactionManagement;
+
+@Configuration
+@EnableTransactionManagement
+public class TransactionPolicyConfig {
+    @Bean
+    public PlatformTransactionManager transactionManager(EntityManagerFactory entityManagerFactory) {
+        return new JpaTransactionManager(entityManagerFactory);
+    }
+}