内容简介：今天发现一个很诡异的事情，就是本地写死的FeignClient的url属性配置进行feign调用没问题，但是把配置迁移到Ctrip Apollo配置中心feign调用就有问题。我们从报错日志发现，api.service.baseUrl这个配置注入失败。我为了验证，专门写一个测试接口，查看配置到底有没有加载：
今天发现一个很诡异的事情，就是本地写死的FeignClient的url属性配置进行feign调用没问题，但是把配置迁移到Ctrip Apollo配置中心feign调用就有问题。
代码片段
@FeignClient(url = "${api.service.baseUrl}",name = "sms-service")
public interface SmsClient {
/**
* 发送短信验证码,4位数字,5分钟有效
*/
@PostMapping("xxxx/xxxxx")
ApiResult<String> sendSmsVerifyCode(String xxx, Integer xxx) ;
/**
* 校验短信验证码
*/
@PostMapping("xxxx/xxxxx")
ApiResult<String> checkSmsVerifyCode(String xxx, Integer codeType, String xxx) ;
}
报错日志
feign.RetryableException: ${api.service.baseUrl} executing POST http://${api.service.baseUrl}/xxx/xxx?xxx=18800009999&xxx=8
at feign.FeignException.errorExecuting(FeignException.java:65)
at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:105)
at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:77)
at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:102)
at com.sun.proxy.$Proxy148.sendSmsVerifyCode(Unknown Source)
at com.yimi.darwin.biz.open.copartner.service.impl.SmsServiceImpl.sendVerifyCode(SmsServiceImpl.java:33)
at com.yimi.darwin.biz.open.copartner.controller.SmsController.sendVerifyCode(SmsController.java:62)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:877)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:665)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129)
at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at com.yimi.tools.filter.RequestAndResponseLoggingFilter.doFilterWrapped(RequestAndResponseLoggingFilter.java:55)
at com.yimi.tools.filter.RequestAndResponseLoggingFilter.doFilterInternal(RequestAndResponseLoggingFilter.java:47)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at org.springframework.cloud.sleuth.instrument.web.ExceptionLoggingFilter.doFilter(ExceptionLoggingFilter.java:48)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at brave.servlet.TracingFilter.doFilter(TracingFilter.java:86)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:155)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:123)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:108)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:65)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:132)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:336)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.net.UnknownHostException: ${api.service.baseUrl}
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:184)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:589)
at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:463)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:558)
at sun.net.www.http.HttpClient.<init>(HttpClient.java:242)
at sun.net.www.http.HttpClient.New(HttpClient.java:339)
at sun.net.www.http.HttpClient.New(HttpClient.java:357)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1220)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1156)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1050)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:984)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1564)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1492)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at feign.Client$Default.convertResponse(Client.java:150)
at feign.Client$Default.execute(Client.java:72)
at org.springframework.cloud.sleuth.instrument.web.client.feign.TracingFeignClient.execute(TracingFeignClient.java:91)
at org.springframework.cloud.sleuth.instrument.web.client.feign.LazyTracingFeignClient.execute(LazyTracingFeignClient.java:55)
at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:98)
... 89 common frames omitted
问题分析与解决
我们从报错日志发现，api.service.baseUrl这个配置注入失败。
我为了验证，专门写一个测试接口，查看配置到底有没有加载：
@Value("${api.service.baseUrl}")
private String url;
@GetMapping("/url")
public String getUrl() {
return url;
}
通过调用localhost:8301/url，接口响应了结果： https://xxx.com/ ,
此时，我们发现，项目中api.service.baseUrl却能拿到值，说明整个项目配置是OK的。
紧接着我们去apollo官方的github上找答案，也是在官方 issue 和 wiki 找到答案的。
当项目启动时候，会扫描@FeignClient注解，扫描的过程中，会注入url的值。但此时apollo配置是在Feign扫描后加载的，其实解决方案就是让apollo先于feign的扫描加载，即apollo配置饥饿加载。
# will inject 'application' namespace in bootstrap phase apollo.bootstrap.enabled = true # put apollo initialization before logging system initialization apollo.bootstrap.eagerLoad.enabled=true
Spring Boot除了支持上述两种集成方式以外，还支持通过application.properties/bootstrap.properties来配置，该方式能使配置在更早的阶段注入，比如使用@ConditionalOnProperty的场景或者是有一些spring-boot-starter在启动阶段就需要读取配置做一些事情（如dubbo-spring-boot-project），所以对于Spring Boot环境建议通过以下方式来接入Apollo(需要0.10.0及以上版本）。
从1.2.0版本开始，如果希望把日志相关的配置（如logging.level.root=info或logback-spring.xml中的参数）也放在Apollo管理，那么可以额外配置apollo.bootstrap.eagerLoad.enabled=true来使Apollo的加载顺序放到日志系统加载之前，不过这会导致Apollo的启动过程无法通过日志的方式输出(因为执行Apollo加载的时候，日志系统压根没有准备好呢！所以在Apollo代码中使用Slf4j的日志输出便没有任何内容)，更多信息可以参考PR 1614。参考配置示例如下：
# will inject ‘application’ namespace in bootstrap phase
apollo.bootstrap.enabled = true
# put apollo initialization before logging system initialization
apollo.bootstrap.eagerLoad.enabled=true
值得注意的是，如果您的apollo client依赖版本是1.1.0及以下的，加了以上的配置，发现是没有用的。我们可以尝试手动去加载。
import com.ctrip.framework.apollo.ConfigService;
public class ClientUrlConfig {
public void init() {
this.initSet("此处写你需要提前初始化的key");
}
private void initSet(String... keys) {
for (String key : keys) {
String val = ConfigService.getAppConfig().getProperty(key, null);
System.setProperty(key, val);
}
}
}
然后在 SpringApplication.run()
之前加载
public static void main(String[] args) {
new ClientUrlConfig().init();
SpringApplication.run(Application.class, args);
}
手动加载后，我们就可以正常使用 ${api.service.baseUrl}进行加载以及Feign调用了。
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