Upgraded to Boot 2.2.1, this fixed the javax.net.ssl.SSLException thrown when application was stopped because the mysql driver had a bug. Also added graceful stopping of the application. And a CommandLineRunner to control application from command line and avoid duplicated declaration of beans.

Added dropping tables  when app is closed, so it can be run as many times as necessary.

Author: iuliana

.gitignore

@@ -6,3 +6,6 @@ build.xml
 manifest.mf
 nbactions.xml
 nb-configuration.xml
+out/
+*.iml
+.idea

HibernateSpringBootAudit/pom.xml

@@ -14,14 +14,14 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>2.1.4.RELEASE</version>
+        <version>2.2.1.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-        <java.version>1.8</java.version>
+        <java.version>12</java.version>
         <maven.compiler.source>12</maven.compiler.source>
         <maven.compiler.target>12</maven.compiler.target>
     </properties>
@@ -31,10 +31,6 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-data-jpa</artifactId>
         </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-jdbc</artifactId>
-        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>

HibernateSpringBootAudit/src/main/java/com/bookstore/MainApplication.java

@@ -1,47 +1,42 @@
 package com.bookstore;
 
-import com.bookstore.auditor.AuditorAwareImpl;
 import com.bookstore.service.BookstoreService;
-import org.springframework.boot.ApplicationRunner;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
-import org.springframework.data.domain.AuditorAware;
 import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
 
 @SpringBootApplication
 @EnableJpaAuditing(auditorAwareRef = "auditorAware")
 public class MainApplication {
-    
-    private final BookstoreService bookstoreService;
 
-    public MainApplication(BookstoreService bookstoreService) {
-        this.bookstoreService = bookstoreService;
-    }
-        
-    public static void main(String[] args) {
-        SpringApplication.run(MainApplication.class, args);
-    }
+    private static final Logger logger = LoggerFactory.getLogger(MainApplication.class);
 
-    @Bean
-    public AuditorAware<String> auditorAware() {
-        return new AuditorAwareImpl();
+    public static void main(String... args) throws Exception {
+        var ctx = SpringApplication.run(MainApplication.class, args);
+
+        logger.info("Started ...");
+        System.in.read();
+        ctx.close();
     }
 
     @Bean
-    public ApplicationRunner init() {
+    public CommandLineRunner scheduleRunner(BookstoreService bookstoreService) {
         return args -> {
             System.out.println("Register new author ...");
             bookstoreService.registerAuthor();
 
             Thread.sleep(5000);
-            
+
             System.out.println("Update an author ...");
-            bookstoreService.updateAuthor();            
-            
+            bookstoreService.updateAuthor();
+
             Thread.sleep(5000);
             System.out.println("Update books of an author ...");
-            bookstoreService.updateBooks();            
+            bookstoreService.updateBooks();
         };
     }
 }

HibernateSpringBootAudit/src/main/java/com/bookstore/auditor/AuditorAwareImpl.java

@@ -4,14 +4,15 @@
 import java.util.Optional;
 import java.util.Random;
 import org.springframework.data.domain.AuditorAware;
+import org.springframework.stereotype.Component;
 
+@Component("auditorAware")
 public class AuditorAwareImpl implements AuditorAware<String> {
 
     @Override
     public Optional<String> getCurrentAuditor() {
-        // use Spring Security to retrive the currently logged-in user(s)
-        return Optional.of(Arrays.asList("mark1990", "adrianm", "dan555")
-                .get(new Random().nextInt(3)));
+        // use Spring Security to retrieve the currently logged-in user(s)
+        return Optional.of(Arrays.asList("mark1990", "adrianm", "dan555").get(new Random().nextInt(3)));
     }
 
 }

HibernateSpringBootAudit/src/main/java/com/bookstore/entity/Author.java

@@ -1,6 +1,5 @@
 package com.bookstore.entity;
 
-import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
@@ -9,7 +8,7 @@
 import javax.persistence.OneToMany;
 
 @Entity
-public class Author extends BaseEntity<String> implements Serializable {
+public class Author extends BaseEntity<String> {
 
     private static final long serialVersionUID = 1L;
 

HibernateSpringBootAudit/src/main/java/com/bookstore/entity/BaseEntity.java

@@ -1,5 +1,6 @@
 package com.bookstore.entity;
 
+import java.io.Serializable;
 import java.time.LocalDateTime;
 import javax.persistence.EntityListeners;
 import javax.persistence.GeneratedValue;
@@ -14,7 +15,7 @@
 
 @MappedSuperclass
 @EntityListeners({AuditingEntityListener.class})
-public abstract class BaseEntity<U> {        
+public abstract class BaseEntity<U> implements Serializable {
 
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)

HibernateSpringBootAudit/src/main/java/com/bookstore/entity/Book.java

@@ -1,13 +1,12 @@
 package com.bookstore.entity;
 
-import java.io.Serializable;
 import javax.persistence.Entity;
 import javax.persistence.FetchType;
 import javax.persistence.JoinColumn;
 import javax.persistence.ManyToOne;
 
 @Entity
-public class Book extends BaseEntity<String> implements Serializable {
+public class Book extends BaseEntity<String>  {
 
     private static final long serialVersionUID = 1L;
 

HibernateSpringBootAudit/src/main/java/com/bookstore/repository/AuthorRepository.java

@@ -7,5 +7,5 @@
 @Repository
 public interface AuthorRepository extends JpaRepository<Author, Long> {
 
-    public Author findByName(String name);
+    Author findByName(String name);
 }

HibernateSpringBootAudit/src/main/java/com/bookstore/service/BookstoreService.java

@@ -20,25 +20,25 @@ public BookstoreService(AuthorRepository authorRepository) {
     @Transactional
     public void registerAuthor() {
 
-        Author a1 = new Author();
+        var a1 = new Author();
         a1.setName("Quartis Young");
         a1.setGenre("Anthology");
         a1.setAge(34);
 
-        Author a2 = new Author();
+        var a2 = new Author();
         a2.setName("Mark Janel");
         a2.setGenre("Anthology");
         a2.setAge(23);
 
-        Book b1 = new Book();
+        var b1 = new Book();
         b1.setIsbn("001");
         b1.setTitle("The Beatles Anthology");
 
-        Book b2 = new Book();
+        var b2 = new Book();
         b2.setIsbn("002");
         b2.setTitle("A People's Anthology");
 
-        Book b3 = new Book();
+        var b3 = new Book();
         b3.setIsbn("003");
         b3.setTitle("Anthology Myths");
 
@@ -52,14 +52,13 @@ public void registerAuthor() {
 
     @Transactional
     public void updateAuthor() {
-        Author author = authorRepository.findByName("Mark Janel");
-
+        var author = authorRepository.findByName("Mark Janel");
         author.setAge(45);
     }
 
     @Transactional
     public void updateBooks() {
-        Author author = authorRepository.findByName("Quartis Young");
+        var author = authorRepository.findByName("Quartis Young");
         List<Book> books = author.getBooks();
 
         for (Book book : books) {

HibernateSpringBootAudit/src/main/java/com/bookstore/service/UserService.java

@@ -8,8 +8,7 @@
 public class UserService {
 
     public String getCurrentUserName() {
-        // use Spring Security to retrive the current user
-        return Arrays.asList("mark1990", "adrianm", "dan555")
-                .get(new Random().nextInt(3));
+        // use Spring Security to retrieve the current user
+        return Arrays.asList("mark1990", "adrianm", "dan555").get(new Random().nextInt(3));
     }
 }