我在A工程中引入了B.jar（由B工程执行maven-install打包而来），使用了B中的Service，我想在A工程中重写B工程中的“CustomerButtonService”类，但是将B工程中的“CustomerButtonService”类拷贝到A工程中后，在启动A工程时，初始化“customerButtonController”时报了下面的异常，在线求救中。
2020-06-15 15:46:08,761 [restartedMain] WARN o.s.b.w.s.c.AnnotationConfigServletWebServerApplicationContext 557 - Exception encountered dur
ing context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating be
an with name 'customerButtonController': Unsatisfied dependency expressed through field 'customerButtonService'; nested exception is org.spr
ingframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.test.os.management.customerButton.service.Custo
merButtonService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.b
eans.factory.annotation.Autowired(required=true)}
APPLICATION FAILED TO START
Description:
Field customerButtonService in com.test.os.management.customerButton.controller.CustomerButtonController required a bean of type 'com.test.os.management.customerButton.service.CustomerButtonService' that could not be found.
Action:
Consider defining a bean of type 'com.test.os.management.customerButton.service.CustomerButtonService' in your configuration.
谢谢“Timor_D”的回答，我按照您的建议查了一遍，都没有问题，不过在检查过程中发现我A工程的pom.xml文件里引入了【devtools】工具，去掉下面这个引用就好了
<!-- spring boot devtools -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
