could not resolve property: product_id of: Comment - spring

Question

Getting an error on server startup a query that finds all comments posted by a user about a specific product.
Caused by: java.lang.IllegalArgumentException: org.hibernate.QueryException: could not resolve property: product_id of: haughton.dvdstore.model.Comment [select c from haughton.dvdstore.model.Comment c where c.product_id = :id]
Repo class
#Repository
public interface CommentDao extends CrudRepository<Comment,Long> {
#Query("select c from Comment c where c.product_id = :id")
List<Comment> allCommentsByProductId(#Param("id") Long id);
}
Comment class
#Entity
public class Comment {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#ManyToOne
#JoinColumn(name = "product_id")
private Product product;
#ManyToOne
#JoinColumn(name = "user_id")
private User user;
private String text;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Product getProduct() {
return product;
}
public void setProduct(Product product) {
this.product = product;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public String getText() {
return text;
}
public void setText(String text) {
this.text = text;
}
}
My product class
#Entity
public class Product {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
private String title;
private String description;
private int quantityInStock;
Date date;
private double price;
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 getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public int getQuantityInStock() {
return quantityInStock;
}
public void setQuantityInStock(int quantityInStock) {
this.quantityInStock = quantityInStock;
}
public Date getDate() {
return date;
}
public void setDate(Date date) {
this.date = date;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
}
User class
#Entity
public class User implements UserDetails {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
#Column(unique = true)
#Size(min = 8, max = 20)
private String username;
#Column(length = 100)
private String password;
#Column(nullable = false)
private boolean enabled;
#OneToOne
#JoinColumn(name = "role_id")
private Role role;
#Override
public Collection<? extends GrantedAuthority> getAuthorities() {
List<GrantedAuthority> authorities = new ArrayList<>();
authorities.add(new SimpleGrantedAuthority(role.getName()));
return authorities;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
#Override
public String getPassword() {
return password;
}
#Override
public String getUsername() {
return username;
}
#Override
public boolean isAccountNonExpired() {
return true;
}
#Override
public boolean isAccountNonLocked() {
return true;
}
#Override
public boolean isCredentialsNonExpired() {
return true;
}
#Override
public boolean isEnabled() {
return enabled;
}
public static PasswordEncoder getPasswordEncoder() {
return PASSWORD_ENCODER;
}
}

Answer 1

It should have been #Query("select c from Comment c where c.product.id = :id")