为什么使用 JUnit 测试 Feign 客户端案例 java.lang.IllegalStateException: Shutdown in progress答案

【问题标题】：Why use JUnit to test Feign client cases java.lang.IllegalStateException: Shutdown in progress为什么使用 JUnit 测试 Feign 客户端案例 java.lang.IllegalStateException: Shutdown in progress
【发布时间】：2018-07-20 03:45:05
【问题描述】：

我想知道Feign接口是否正确，所以我用JUnit来测试一下。（Spring Boot 版本为 1.5.13.RELEASE）

@RunWith(SpringRunner.class)
@SpringBootTest(classes = App.class)
public class ProductAuthClientTest {
    @Autowired
    private ProductAuthClient productAuthClient;
    @Test
    public void test(){
      ProductAuth productAuth = productAuthClient.getProductAuth(1);
        Assert.assertNotNull(productAuth);
    }
}

JUnit 测试通过，但控制台打印错误消息。

2018-07-20 11:32:16.808  INFO 3272 --- [       Thread-5] c.n.u.concurrent.ShutdownEnabledTimer    : Shutdown hook removed for: NFLoadBalancer-PingTimer-service-cloud-mysql
2018-07-20 11:32:16.812  INFO 3272 --- [       Thread-5] c.n.u.concurrent.ShutdownEnabledTimer    : Exception caught (might be ok if at shutdown)

java.lang.IllegalStateException: Shutdown in progress
    at java.lang.ApplicationShutdownHooks.remove(ApplicationShutdownHooks.java:82) ~[na:1.8.0_171]
    at java.lang.Runtime.removeShutdownHook(Runtime.java:239) ~[na:1.8.0_171]
    at com.netflix.util.concurrent.ShutdownEnabledTimer.cancel(ShutdownEnabledTimer.java:70) ~[netflix-commons-util-0.1.1.jar:na]
    at com.netflix.loadbalancer.BaseLoadBalancer.cancelPingTask(BaseLoadBalancer.java:613) [ribbon-loadbalancer-2.2.5.jar:2.2.5]
    at com.netflix.loadbalancer.BaseLoadBalancer.shutdown(BaseLoadBalancer.java:864) [ribbon-loadbalancer-2.2.5.jar:2.2.5]
    at com.netflix.loadbalancer.DynamicServerListLoadBalancer.shutdown(DynamicServerListLoadBalancer.java:285) [ribbon-loadbalancer-2.2.5.jar:2.2.5]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_171]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_171]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_171]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_171]
    at org.springframework.beans.factory.support.DisposableBeanAdapter.invokeCustomDestroyMethod(DisposableBeanAdapter.java:364) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:287) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:583) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:555) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:961) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:516) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:968) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1032) [spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1008) [spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:958) [spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.cloud.context.named.NamedContextFactory.destroy(NamedContextFactory.java:76) [spring-cloud-context-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:272) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:583) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:555) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:961) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:516) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:968) [spring-beans-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1032) [spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1008) [spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext$2.run(AbstractApplicationContext.java:929) [spring-context-4.3.17.RELEASE.jar:4.3.17.RELEASE]

2018-07-20 11:32:16.821  INFO 3272 --- [       Thread-5] com.netflix.discovery.DiscoveryClient    : Shutting down DiscoveryClient ...
2018-07-20 11:32:16.831  INFO 3272 --- [       Thread-5] com.netflix.discovery.DiscoveryClient    : Completed shut down of DiscoveryClient
2018-07-20 11:32:16.856  WARN 3272 --- [       Thread-5] c.n.c.sources.URLConfigurationSource     : No URLs will be polled as dynamic configuration sources.
2018-07-20 11:32:16.856  INFO 3272 --- [       Thread-5] c.n.c.sources.URLConfigurationSource     : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.

所以我想问为什么会这样，这个错误信息是什么意思？以及如何避免这种情况？

【问题讨论】：

您是否阅读了错误信息？
我不明白你的意思......
Exception caught (might be ok if at shutdown)
我注意到这句话，不影响我正常测试。因为我只想做一个简单的单元测试来确保 Feign 是可调用的。但是有没有办法避免日志中出现这个异常消息？就算没有效果。能不能告诉我在相关微服务启动后有没有更好的方法来测试 FeignClient？
由于它是功能区，它可能与请求的线程调度有关，并且在非常短暂的上下文中是可以预期的。最简单的方法是将该记录器的日志级别设置为WARN 或ERROR。

标签： java spring-boot junit spring-cloud

【解决方案1】：

我也有同样的问题，但这个例外没什么大不了的。如果你想完成测试，你只需添加逻辑代码重复它。像这样：

@Test
public void test(){
    try{
       ProductAuth productAuth = productAuthClient.getProductAuth(1);
       Assert.assertNotNull(productAuth);
    } catch (IllegalStateException illEx) {
       ProductAuth productAuth = productAuthClient.getProductAuth(1);
       Assert.assertNotNull(productAuth);
    }
}

或者：

@Test
public void test(){
    int num = 10;// try to do 10 times
    while(num > 0) {
         num --;
         try {
             ProductAuth productAuth = productAuthClient.getProductAuth(1);
             Assert.assertNotNull(productAuth);
             break;// if don't have throw exception, than stop this while
         } catch (IllegalStateException illEx) {}
    }
}

希望对你有帮助

【讨论】：