- 問題出現：
當消費者客戶端調用提供者的服務時，會出現以下錯誤，調用方出現以下錯誤
2020-11-27 17:03:51.996 ERROR 11536 --- [p-nio-80-exec-5] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.client.HttpServerErrorException$InternalServerError: 500 : [{"timestamp":"2020-11-27T09:03:51.952+00:00","status":500,"error":"Internal Server Error","trace":"com.netflix.hystrix.contrib.javanica.exception.FallbackDefinitionException: fallback method wasn't fo... (8286 bytes)]] with root cause
org.springframework.web.client.HttpServerErrorException$InternalServerError: 500 : [{"timestamp":"2020-11-27T09:03:51.952+00:00","status":500,"error":"Internal Server Error","trace":"com.netflix.hystrix.contrib.javanica.exception.FallbackDefinitionException: fallback method wasn't fo... (8286 bytes)]
at org.springframework.web.client.HttpServerErrorException.create(HttpServerErrorException.java:100) ~[spring-web-5.2.7.RELEASE.jar:5.2.7.RELEASE]
而提供接口服務的一方報的錯誤如下：
2020-11-27 17:03:51.937 ERROR 376 --- [nio-8001-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is com.netflix.hystrix.contrib.javanica.exception.FallbackDefinitionException: fallback method wasn't found: processHystrixGetDept([long])] with root cause
com.netflix.hystrix.contrib.javanica.exception.FallbackDefinitionException: fallback method wasn't found: processHystrixGetDept([long])
從上面的報錯信息可以看出來 fallback method wasn't found: processHystrixGetDept([long]) ，說明是fallback method 方法有問題，后來發現是Long和long的問題，代碼如下：
@GetMapping("/dept/get/{id}")
@HystrixCommand(fallbackMethod = "processHystrixGetDept")
public Dept dept(@PathVariable("id") long id) {
Dept dept = deptService.queryById(id);
if (dept == null) {
throw new RuntimeException("該id" + id + "沒有對應的信息");
}
return dept;
}
public Dept processHystrixGetDept(Long id) {
return new Dept().setDeptno(id)
.setDname("該id：" + id + "沒有對應的信息，null@HystrixCommand")
.setDb_source("沒有該數據庫信息");
}
- 問題解決，定義的備用方法中是Long包裝類，但是原始方法中是long基本類型，這就是報錯的源頭，我將其統一之后就沒有報錯了