org.postgresql.util.PSQLException: ERROR: relation "products" does not exist

Question

I'm working on the following code:

Product

 @Entity
 @Table(name = "products",
 public class Product extends RepresentativeModel {
 @ManyToMany(mappedBy = "products", targetEntity = Category.class)
 private Set<Category> categories = new HashSet<>();
 }

Category

 @Entity
 @Table(name = "categories",
 public class Category extends RepresentativeModel {
 @ManyToMany
@JoinTable(name = "productToCategory",
        joinColumns = {@JoinColumn(name = "categoryId")},
        inverseJoinColumns = {@JoinColumn(name = "productId")})
private Set<Product> products = new HashSet<>();
 }

EM config

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory(@Qualifier("dataSource") DataSource source) {
    LocalContainerEntityManagerFactoryBean entityManagerFactory = new LocalContainerEntityManagerFactoryBean();
    entityManagerFactory.setDataSource(source);
    entityManagerFactory.setPackagesToScan("com.x.model");
    JpaVendorAdapter jpaVendorAdapter = new HibernateJpaVendorAdapter();
    entityManagerFactory.setJpaVendorAdapter(jpaVendorAdapter);
    entityManagerFactory.setJpaProperties(jpaProperties());
    entityManagerFactory.setPersistenceUnitName(PERSISTENCE_UNIT_NAME);
    log.debug("PERSISTENCE UNIT " + PERSISTENCE_UNIT_NAME);
    return entityManagerFactory;
}

Package info

package is com.x.model for both

Properties properties = new Properties(); 
properties.put("hibernate.default_schema", "public"); 
entityManagerFactory.setJpaProperties(properties); 

---

Problem

Products tables exists in the database, but I'm getting this error message:

org.postgresql.util.PSQLException: ERROR: relation "products" does not exist

I tried to change entity name to " products " or to change mappedBy to " Product ", but without success.

How to fix this?

Answer 1

I've had the same problem, and all the answers in internet did not help me. And I find out that postrgres creates tables in case sensitive manner, if you add double quotes when creating tables.

"auteur" and auteur are two different names.

I don't know exactly how it works, but apparently Hibernate cannot find the @JoinTable for the @ManyToMany relation, because, as I wrote above, this is a different table for postgres. Knowing this solved my problem. Maybe this will help someone else.