这是我尝试启动我的spring Boot 应用程序时出现的错误iam。操作：考虑在配置中定义一个类型为“java.lang.String”的bean。
我的代码

@Repository
public class ProductRepository {
@Autowired
JdbcTemplate jdbcTemplate;
@Bean
public void addProduct(String name) {
    String sql = "INSERT INTO product VALUES (NULL, ?)";
    jdbcTemplate.update(sql, name);
}
}
@Service
public class ProductService {
@Autowired
ProductRepository productRepository;
public void addProduct(String name) {
    productRepository.addProduct(name);
}
}
@RestController
@RequestMapping(path="product")
public class ProductController {
@Autowired
ProductService productService;
@PostMapping(path="/add/{name}")
public void addProduct(@PathVariable 
String name) {
    productService.addProduct(name);
}
}

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