I created a small application in Spring Tool suite 4. I checked my code hundreds of times but didn't find any error. When application is executed it says:
"The web application [ROOT] appears to have started a thread named [HikariPool-1 housekeeper] but has failed to stop it. This is very likely to create a memory leak."
My Code
Bootstrap
...
@Component
public class BootStrapData implements CommandLineRunner {
private final AuthorRepository authorRepository;
private final BookRepository bookRepository;
private final PublisherRepository publisherRepository;
public BootStrapData(AuthorRepository authorRepository, BookRepository bookRepository, PublisherRepository publisherRepository) {
this.authorRepository = authorRepository;
this.bookRepository = bookRepository;
this.publisherRepository = publisherRepository;
}
@Override
public void run(String... args) throws Exception {
System.out.println("Started in Bootstrap");
Publisher publisher = new Publisher();
publisher.setName("SFG Publishing");
publisher.setCity("St Petersburg");
publisher.setState("FL");
publisherRepository.save(publisher);
System.out.println("Publisher Count: " + publisherRepository.count());
Author eric = new Author("Eric", "Evans");
Book ddd = new Book("Domain Driven Design", "123123");
eric.getBooks().add(ddd);
ddd.getAuthors().add(eric);
ddd.setPublisher(publisher);
publisher.getBooks().add(ddd);
authorRepository.save(eric);
bookRepository.save(ddd);
publisherRepository.save(publisher);
Author rod = new Author("Rod", "Johnson");
Book noEJB = new Book("J2EE Development without EJB", "3939459459");
rod.getBooks().add(noEJB);
noEJB.getAuthors().add(rod);
noEJB.setPublisher(publisher);
publisher.getBooks().add(noEJB);
authorRepository.save(rod);
bookRepository.save(noEJB);
publisherRepository.save(publisher);
System.out.println("Number of Books: " + bookRepository.count());
System.out.println("Publisher Number of Books: " + publisher.getBooks().size());
}
}
Entity
...
@Entity
public class Book {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String title;
private String isbn;
@ManyToOne
private Publisher publisher;
@ManyToMany
@JoinTable(name = "author_book", joinColumns = @JoinColumn(name = "book_id"),
inverseJoinColumns = @JoinColumn(name = "author_id"))
private Set<Author> authors = new HashSet<>();
public Book() {
}
public Book(String title, String isbn) {
this.title = title;
this.isbn = isbn;
}
public Publisher getPublisher() {
return publisher;
}
public void setPublisher(Publisher publisher) {
this.publisher = publisher;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getIsbn() {
return isbn;
}
public void setIsbn(String isbn) {
this.isbn = isbn;
}
public Set<Author> getAuthors() {
return authors;
}
public void setAuthors(Set<Author> authors) {
this.authors = authors;
}
@Override
public String toString() {
return "Book{" +
"id=" + id +
", title='" + title + '\'' +
", isbn='" + isbn + '\'' +
", authors=" + authors +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Book book = (Book) o;
return id != null ? id.equals(book.id) : book.id == null;
}
@Override
public int hashCode() {
return id != null ? id.hashCode() : 0;
}
}
...
@Entity
public class Author {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String firstName;
private String lastName;
@ManyToMany(mappedBy = "authors")
private Set<Book> books = new HashSet<>();
public Author() {
}
public Author(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public Set<Book> getBooks() {
return books;
}
public void setBooks(Set<Book> books) {
this.books = books;
}
@Override
public String toString() {
return "Author{" +
"id=" + id +
", firstName='" + firstName + '\'' +
", lastName='" + lastName + '\'' +
", books=" + books +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Author author = (Author) o;
return id != null ? id.equals(author.id) : author.id == null;
}
@Override
public int hashCode() {
return id != null ? id.hashCode() : 0;
}
}
...
@Entity
public class Publisher {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String name;
private String addressLine1;
private String city;
private String state;
private String zip;
@OneToMany
@JoinColumn(name = "publisher_id")
private Set<Book> books = new HashSet<>();
public Publisher() {
}
public Set<Book> getBooks() {
return books;
}
public void setBooks(Set<Book> books) {
this.books = books;
}
@Override
public String toString() {
return "Publisher{" +
"id=" + id +
", name='" + name + '\'' +
", addressLine1='" + addressLine1 + '\'' +
", city='" + city + '\'' +
", state='" + state + '\'' +
", zip='" + zip + '\'' +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
Publisher publisher = (Publisher) o;
return id != null ? id.equals(publisher.id) : publisher.id == null;
}
@Override
public int hashCode() {
return id != null ? id.hashCode() : 0;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddressLine1() {
return addressLine1;
}
public void setAddressLine1(String addressLine1) {
this.addressLine1 = addressLine1;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getState() {
return state;
}
public void setState(String state) {
this.state = state;
}
public String getZip() {
return zip;
}
public void setZip(String zip) {
this.zip = zip;
}
}...
repositories
public interface AuthorRepository extends CrudRepository<Author, Long>{
}
public interface BookRepository extends CrudRepository<Book, Long>{
}
public interface PublisherRepository extends CrudRepository<Publisher, Long>{
}
