问题出现

Spring Boot整合Sleuth+Zipkin，导入依赖后报错、无法处理请求，报错详情如下。项目使用的spring-cloud-dependencies版本为2021.0.6。

java.lang.IllegalStateException: Could not access method or field: Class org.springframework.util.ReflectionUtils can not access a member of class org.springframework.cloud.sleuth.instrument.session.TraceSessionRepository with modifiers "public"
	at org.springframework.util.ReflectionUtils.handleReflectionException(ReflectionUtils.java:107) ~[spring-core-5.3.26.jar:5.3.26]
	at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:285) ~[spring-core-5.3.26.jar:5.3.26]
	at org.springframework.cloud.sleuth.instrument.session.TraceSessionRepositoryAspect.callMethodOnWrappedObject(TraceSessionRepositoryAspect.java:82) ~[spring-cloud-sleuth-instrumentation-3.1.7.jar:3.1.7]
	at org.springframework.cloud.sleuth.instrument.session.TraceSessionRepositoryAspect.wrapSessionRepository(TraceSessionRepositoryAspect.java:66) ~[spring-cloud-sleuth-instrumentation-3.1.7.jar:3.1.7]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_341]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_341]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_341]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_341]
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:634) ~[spring-aop-5.3.26.jar:5.3.26]
	at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:624) ~[spring-aop-5.3.26.jar:5.3.26]
	at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:72) ~[spring-aop-5.3.26.jar:5.3.26]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.26.jar:5.3.26]
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) ~[spring-aop-5.3.26.jar:5.3.26]
	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97) ~[spring-aop-5.3.26.jar:5.3.26]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.26.jar:5.3.26]
	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) ~[spring-aop-5.3.26.jar:5.3.26]
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:708) ~[spring-aop-5.3.26.jar:5.3.26]
	at org.springframework.session.data.redis.RedisIndexedSessionRepository$$EnhancerBySpringCGLIB$$aae8c53c.findById(<generated>) ~[spring-session-data-redis-2.7.1.jar:2.7.1]
	at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getRequestedSession(SessionRepositoryFilter.java:356) ~[spring-session-core-2.7.1.jar:2.7.1]
	at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getSession(SessionRepositoryFilter.java:290) ~[spring-session-core-2.7.1.jar:2.7.1]
	at org.springframework.session.web.http.SessionRepositoryFilter$SessionRepositoryRequestWrapper.getSession(SessionRepositoryFilter.java:193) ~[spring-session-core-2.7.1.jar:2.7.1]
	at org.springframework.web.util.WebUtils.getSessionId(WebUtils.java:359) ~[spring-web-5.3.26.jar:5.3.26]
	at org.springframework.web.servlet.FrameworkServlet.publishRequestHandledEvent(FrameworkServlet.java:1145) ~[spring-webmvc-5.3.26.jar:5.3.26]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1023) ~[spring-webmvc-5.3.26.jar:5.3.26]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.26.jar:5.3.26]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:502) ~[tomcat-embed-core-9.0.73.jar:4.0.FR]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.26.jar:5.3.26]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:596) ~[tomcat-embed-core-9.0.73.jar:4.0.FR]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.26.jar:5.3.26]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.26.jar:5.3.26]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:102) ~[spring-web-5.3.26.jar:5.3.26]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:142) ~[spring-session-core-2.7.1.jar:2.7.1]
	at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:82) ~[spring-session-core-2.7.1.jar:2.7.1]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.springframework.cloud.sleuth.instrument.web.servlet.TracingFilter.doFilter(TracingFilter.java:68) ~[spring-cloud-sleuth-instrumentation-3.1.7.jar:3.1.7]
	at org.springframework.cloud.sleuth.autoconfig.instrument.web.TraceWebServletConfiguration$LazyTracingFilter.doFilter(TraceWebServletConfiguration.java:131) ~[spring-cloud-sleuth-autoconfigure-3.1.7.jar:3.1.7]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:102) ~[spring-web-5.3.26.jar:5.3.26]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:661) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:427) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:357) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:294) ~[tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.StandardHostValve.custom(StandardHostValve.java:373) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.StandardHostValve.status(StandardHostValve.java:237) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.StandardHostValve.throwable(StandardHostValve.java:319) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.springframework.cloud.sleuth.instrument.web.tomcat.TraceValve.invoke(TraceValve.java:103) [spring-cloud-sleuth-instrumentation-3.1.7.jar:3.1.7]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:389) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1791) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.73.jar:9.0.73]
	at java.lang.Thread.run(Thread.java:750) [na:1.8.0_341]

2024-01-23 20:51:58.346  INFO [douyamall-product,,] 10468 --- [192.168.104.148] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.

问题原因及解决

具体原因未知。下面直接介绍解决方法。

方法一：禁用Spring Session检测

看报错第一行，是反射工具（ReflectionUtils）在访问一个TraceSessionRepository类对象成员的时候失败了，这个看名字应该与Spring Session有关。在Sleuth官方文档发现，可以配置是否开启Spring Session检测。将其关闭：

# application.yml
spring:
  sleuth:
   session:
     enabled: false
   # ...其它配置项

发现已无此问题。

方法二：降低Spring Cloud依赖版本

将Spring Cloud依赖版本从2021.0.6降到2021.0.5也可以解决此问题。

方法三：不降级Spring Cloud版本的方式

手动引入sleuth和zipkin及其依赖，全部使用3.1.5版本，而非spring-cloud-dependencies中指定的3.1.7。

<properties>
    <sleuth.version>3.1.5</sleuth.version>
</properties>

<dependencies>
	...其它依赖
	
	<dependency>
	    <groupId>org.springframework.cloud</groupId>
	    <artifactId>spring-cloud-starter-sleuth</artifactId>
	    <version>${sleuth.version}</version>
	</dependency>
	<dependency>
	    <groupId>org.springframework.cloud</groupId>
	    <artifactId>spring-cloud-sleuth-brave</artifactId>
	    <version>${sleuth.version}</version>
	</dependency>
	<dependency>
	    <groupId>org.springframework.cloud</groupId>
	    <artifactId>spring-cloud-sleuth-autoconfigure</artifactId>
	    <version>${sleuth.version}</version>
	</dependency>
	<dependency>
	    <groupId>org.springframework.cloud</groupId>
	    <artifactId>spring-cloud-sleuth-zipkin</artifactId>
	    <version>${sleuth.version}</version>
	</dependency>
	<dependency>
	    <groupId>org.springframework.cloud</groupId>
	    <artifactId>spring-cloud-sleuth-instrumentation</artifactId>
	    <version>${sleuth.version}</version>
	</dependency>
</dependencies>

本文参考：
https://github.com/spring-cloud/spring-cloud-sleuth/issues/2267