今天在使用 SpringCloud 時遇到了一個問題，感覺有不少小伙伴會遇到，所以記錄下來
版本說明
SpringBoot 2.2.4.RELEASE
SpringCloud Greenwich.SR1
情景復現
在 pom.xml 中加入如下依賴
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
啟動項目后報錯 The following method did not exist: org.springframework.boot.actuate.health.CompositeHealthIndicator
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APPLICATION FAILED TO START
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Description:
An attempt was made to call a method that does not exist. The attempt was made from the following location:
org.springframework.cloud.client.discovery.health.DiscoveryCompositeHealthIndicator.<init>(DiscoveryCompositeHealthIndicator.java:42)
The following method did not exist:
org.springframework.boot.actuate.health.CompositeHealthIndicator.<init>(Lorg/springframework/boot/actuate/health/HealthAggregator;)V
The method's class, org.springframework.boot.actuate.health.CompositeHealthIndicator, is available from the following locations:
jar:file:/Volumes/Others/MVNrepository/org/springframework/boot/spring-boot-actuator/2.2.4.RELEASE/spring-boot-actuator-2.2.4.RELEASE.jar!/org/springframework/boot/actuate/health/CompositeHealthIndicator.class
It was loaded from the following location:
file:/Volumes/Others/MVNrepository/org/springframework/boot/spring-boot-actuator/2.2.4.RELEASE/spring-boot-actuator-2.2.4.RELEASE.jar
Action:
Correct the classpath of your application so that it contains a single, compatible version of org.springframework.boot.actuate.health.CompositeHealthIndicator
問題分析
問題所在就是——版本沖突
我使用的 SpringBoot 版本是2.2.4，而 SpringCloud 版本是 Greenwich，二者的兼容還是有一定問題的，所以在啟動時會報錯：在 spring-boot-actuator-2.2.4.RELEASE.jar 下找不到 CompositeHealthIndicator.class
解決方法
解決方法有如下兩種，我都已經測試過，這兩種方法都可以解決問題
- 降級 SpringBoot
把 SpringBoot 從 2.2.4.RELEASE 降級成 2.1.4.RELEASE - 升級 SpringCloud
把 SpringCloud 從 Greenwich.SR1 升級成 Hoxton.SR1
按如上所示即可成功解決問題，小伙伴們趕緊去試一下吧~