Spring boot repository not found-CodePudding

This is my service class

package com.example.demo.service;
import com.example.demo.dto.Invoicedto;
import com.example.demo.model.Item;
import com.example.demo.repository.ItemRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class InvoiceService implements InvoiceServiceInterface {
    @Autowired
    private ItemRepository itemRepository;
    public void createInvoice(Invoicedto invoiceDto) {
        try {
            List<Item> itemList = this.itemRepository.findAll();
            for (Item item : itemList) {
                System.out.println(item.getId());
            }
        } catch (Exception e) {
            System.out.println("Exception occurred "   e.getMessage());
        }
    }
}

this is my repository

package com.example.demo.repository;
import com.example.demo.model.Item;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import java.util.List;

@Repository
public interface ItemRepository   extends JpaRepository<Item, Long> {

    List<Item> findAll();

    @Modifying
    @Query("DELETE Item c WHERE c.id = ?1")
    void deleteById(long id); 
}

Though I added necessary annotations this always give

Exception occurred Cannot invoke "com.example.demo.repository.ItemRepository.findAll()" because "this.itemRepository" is null

Why is this happening what is the fix?

CodePudding user response：

Maybe Spring Component Scan is not finding your repository bean due to your package structure.

Make sure the main class with the @SpringBootApplication annotation is in this package: package com.example.demo;

CodePudding user response：

Here two things I can see in your code which are not required.

    1. List<Item> itemList = this.itemRepository.findAll();

    List<Item> itemList = itemRepository.findAll();

As you are extending JpaRepository no need to declare findAll() and deleteById() methods in repository interface. So please change as below and try once.
```
public interface ItemRepository extends JpaRepository<Item, Long> {

}
```

References: findAll deleteById

CodePudding user response：

You can try to manually specify directory of your repositories with: @EnableJpaRepositories("some.root.package") //path to repository package

CodePudding user response：

1)List<Item> findAll();
you don't have to write this line inside the repository you will get this from JPA JpaRepository<ClassName,Long> Interface;.

2)List<Item> getAllItem();this line declare inside your service package 

3) List<Item> itemList = this.itemRepository.findAll();
            for (Item item : itemList) {
                System.out.println(item.getId());}
and here you don't have to user this before item itemRepository.findAll().
you can directly use  List<Item> itemList = itemRepository.findAll();