WebClient调用中的Webflux微服务错误；

Question

我试图通过使用Java+Spring+WebFlux开始反应性编程。

@RestController
@RequestMapping("/customers")
public class CustomerController {

@GetMapping("/{id}")
    public Mono<Customer> customerById(@PathVariable String id){
        return customerService.findById(id);
    }
}

public class Customer {

    public Customer(String id, String fullName) {
        this.id = id;
        this.fullName = fullName;
    }

    @Id
    private String id;
    @NotNull(message = "The name must not be null")
    private String fullName;
    private String email;
    private String document;
}

//Service Class
public Mono<Customer> findById(String id){
        return Mono.just(new Customer(id, "Joseph"));
    }

//Method on Controller
@RestController
@RequestMapping("v1/customers")
public class CustomerController {

@GetMapping("/{id}")
    public Mono<Customer> customerById(@PathVariable String id){
        return customerService.findById(id);
    }
}

{
id: "123",
fullName: "Joseph",
email: null,
document: null
}

当我在customer consumerendpoint上调用get时，我得到一个httpcode=500

下面是客户消费者上的服务层

    private String BASE_URL = "http://localhost:8060/";

    public Mono<Customer> findById(String id){
        WebClient.Builder builder = WebClient.builder();
       return builder               
                .baseUrl(BASE_URL)
                .build()
                .get()
                .uri("customers/{id}", id)
                .retrieve()
                .bodyToMono(Customer.class);
    }

我还尝试删除.baseurl(BASE_URL)和.uri()中的concinting，但没有成功。

2019-12-01 22:21:45.910 ERROR 16788 --- [ctor-http-nio-2] a.w.r.e.AbstractErrorWebExceptionHandler : [1510eee8]  500 Server Error for HTTP GET "/v1/customers/123"

java.lang.NullPointerException: null at com.poc.controller.CustomerController.findById(CustomerController.java:19) ~[classes/:na]
    Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException: 
Error has been observed at the following site(s):
    |_ checkpoint ? HTTP GET "/v1/customers/123" [ExceptionHandlingWebHandler]
Stack trace:
        at com.poc.webportal.controller.CustomerController.findById(CustomerController.java:19) ~[classes/:na]

Answer 1

这很尴尬，但我忘了在控制器上注入CustomerService。

所以，autowired解决了这个问题。