问题概述

在分布式微服务中，由于部署的是多实例，消息来了之后，为了保证在多实例的情况下在同一时刻，只能由一个定时任务来消费，所以，这儿就使用到了Spring Boot中的一款超好用的轻量级分布式锁 ShedLock 来实现分布式锁的情况，但是在SpringBoot分布式项目中集成ShedLock锁时遇到的一个问题 “ No qualifying bean of type 'net.javacrumbs.shedlock.core.LockProvider' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.context.annotation.Lazy(value=true)} ”，如下图：

异常详细信息如下：

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'net.javacrumbs.shedlock.core.LockProvider' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.context.annotation.Lazy(value=true)}
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1506)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101)
	at org.springframework.context.annotation.ContextAnnotationAutowireCandidateResolver$1.getTarget(ContextAnnotationAutowireCandidateResolver.java:90)
	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:193)
	at com.sun.proxy.$Proxy104.lock(Unknown Source)
	at net.javacrumbs.shedlock.core.DefaultLockingTaskExecutor.executeWithLock(DefaultLockingTaskExecutor.java:53)
	at net.javacrumbs.shedlock.core.DefaultLockingTaskExecutor.executeWithLock(DefaultLockingTaskExecutor.java:42)
	at net.javacrumbs.shedlock.core.DefaultLockManager.executeWithLock(DefaultLockManager.java:52)
	at net.javacrumbs.shedlock.core.LockableRunnable.run(LockableRunnable.java:37)
	at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
	at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
	at java.util.concurrent.FutureTask.run(FutureTask.java)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	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)

2019-12-26 17:33:00.003 ERROR 18016 --- [taskScheduler-5] o.s.s.s.TaskUtils$LoggingErrorHandler    : Unexpected error occurred in scheduled task.

解决办法

这个是由于版本过高导致的，降低版本即可解决！

版本兼容更新没更上导致的，最开始我使用的是4.x的，然后经过细微的调整，改到3.x版本就可以了！！！

 好了，关于 No qualifying bean of type 'net.javacrumbs.shedlock.core.LockProvider' available: expected at 的解决办法 就写到这儿了，如果还有什么疑问或遇到什么问题欢迎扫码提问，也可以给我留言哦，我会一一详细的解答的。 
歇后语：“ 共同学习，共同进步 ”，也希望大家多多关注CSND的IT社区。