sync source code with article

persistence-modules/spring-hibernate4/src/main/java/com/baeldung/hibernate/audit/AuditorAwareImpl.java

@@ -0,0 +1,21 @@
+package com.baeldung.hibernate.audit;
+
+import java.util.Optional;
+
+import org.springframework.data.domain.AuditorAware;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.stereotype.Component;
+
+@Component("auditorProvider")
+public class AuditorAwareImpl implements AuditorAware<String> {
+
+    @Override
+    public String getCurrentAuditor() {
+        return Optional.ofNullable(SecurityContextHolder.getContext())
+            .map(e -> e.getAuthentication())
+            .map(Authentication::getName)
+            .orElse(null);
+    }
+
+}

persistence-modules/spring-hibernate4/src/main/java/com/baeldung/spring/PersistenceConfig.java

@@ -46,7 +46,7 @@ import com.google.common.base.Preconditions;
 @Configuration
 @EnableTransactionManagement
 @EnableJpaRepositories(basePackages = { "com.baeldung.persistence" }, transactionManagerRef = "jpaTransactionManager")
-@EnableJpaAuditing
+@EnableJpaAuditing(auditorAwareRef = "auditorProvider")
 @PropertySource({ "classpath:persistence-h2.properties" })
 @ComponentScan({ "com.baeldung.persistence" })
 public class PersistenceConfig {