Java Spring Boot Entites not saving to JpaRepository - spring

Question

That's my first project with Spring Boot implemented. I tried going step by step with official Spring tutorial but I'm stuck with a problem that I can't find any answer about.
Whenever I try to call findAll() or find() method on my repository it returns empty array [].
Even with manual preloading enitites like done in tutorial and immediately trying to display database content I get the same result.
I can guess I'm missing something silly, but I can't figure it out for some hours now. What's the cause? Tomcat/jpa/spring version mismatch? Missing annotation somewhere?
Here's my AnimalRepository.java
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
#Repository
public interface AnimalRepository extends JpaRepository<Animal, Long> {
}
LoadDatabase.java
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.Transactional;
#Configuration
class LoadDatabase {
private static final Logger log = LoggerFactory.getLogger(LoadDatabase.class);
#Bean
CommandLineRunner initDatabase(AnimalRepository repository) {
return args -> {
log.info("Preloading " + repository.save(new Lion("Bilbo")));
log.info("Preloading " + repository.save(new Lion("Frodo")));
log.info(repository.findAll().toString()); //try to log content to console
};
}
}
The logging above basically ends up with this console output:
logging result
Probably not as important, but AnimalController.java
import org.springframework.web.bind.annotation.*;
import java.util.List;
#RestController
public class AnimalController {
private final AnimalRepository repository;
AnimalController(AnimalRepository repository) {
this.repository = repository;
}
#GetMapping("/animals")
List<Animal> all() {
repository.save(new Lion("Bilbo")); //this doesn't work either
return repository.findAll();
}
#PostMapping("/animals")
Animal newAnimal(#RequestBody Animal newAnimal) {
return repository.save(newAnimal);
}
#GetMapping("/animals/{id}")
Animal one(#PathVariable Long id) {
return repository.findById(id)
.orElseThrow(() -> new AnimalNotFoundException(id));
}
#PutMapping("/animals/{id}")
Animal replaceAnimal(#RequestBody Animal newAnimal, #PathVariable Long id) {
return repository.findById(id)
.map(animal -> {
animal.setName(newAnimal.getName());
animal.setSpecies(newAnimal.getSpecies());
return repository.save(animal);
})
.orElseGet(() -> {
newAnimal.setId(id);
return repository.save(newAnimal);
});
}
#DeleteMapping("/animals/{id}")
void deleteAnimal(#PathVariable Long id) {
repository.deleteById(id);
}
}
And the finally Lion.java
import jakarta.persistence.Entity;
import jakarta.persistence.GeneratedValue;
import jakarta.persistence.Id;
import java.util.Objects;
#Entity
public class Lion implements Animal {
private #Id
#GeneratedValue Long id;
private String name;
private String species;
private int requiredFood;
//private Zone zone;
public Lion(String name) {
this.name = name;
this.species = this.getClass().getSimpleName();
this.requiredFood = LION_REQUIRED_FOOD;
}
public Lion() {
}
#Override
public Long getId() {
return id;
}
#Override
public void setId(Long id) {
this.id = id;
}
#Override
public String getName() {
return name;
}
#Override
public void setName(String name) {
this.name = name;
}
#Override
public String getSpecies() {
return species;
}
#Override
public void setSpecies(String species) {
this.species = species;
}
#Override
public int getRequiredFood() {
return requiredFood;
}
#Override
public void setRequiredFood(int requiredFood) {
this.requiredFood = requiredFood;
}
#Override
public boolean equals(Object o) {
if (this == o)
return true;
if (!(o instanceof Animal animal))
return false;
return Objects.equals(this.id, animal.getId()) && Objects.equals(this.name, animal.getName())
&& Objects.equals(this.species, animal.getSpecies());
}
#Override
public int hashCode() {
return Objects.hash(this.id, this.name, this.species);
}
#Override
public String toString() {
return "Animal{" + "id=" + this.id + ", name='" + this.name + '\'' + ", species='" + this.species + '\'' + '}';
}
}
I tried switching JpaRepository to CrudRepository, but that didn't work out.

Answer 1

I think the problem here is that your data haven't been saved to the database, because of the transaction. try to change your repository.save() to repository.saveAndFlush()