报错：2024-08-12T18:39:35.313+08:00 ERROR 29668 --- [demo2] [ main] o.s.boot.SpringApplication : Application run failed

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [com.example.demo.DemoApplication]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:179) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:417) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:290) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:349) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:118) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:789) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:607) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.3.2.jar:3.3.2]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-3.3.2.jar:3.3.2]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456) ~[spring-boot-3.3.2.jar:3.3.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:335) ~[spring-boot-3.3.2.jar:3.3.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1363) ~[spring-boot-3.3.2.jar:3.3.2]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1352) ~[spring-boot-3.3.2.jar:3.3.2]
at com.example.demo.DemoApplication.main(DemoApplication.java:16) ~[classes/:na]
Caused by: org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'gameController' for bean class [com.example.gomoku.GameController] conflicts with existing, non-compatible bean definition of same name and class [com.example.demo.GameController]
at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.checkCandidate(ClassPathBeanDefinitionScanner.java:361) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:288) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:128) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:306) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:246) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:197) ~[spring-context-6.1.11.jar:6.1.11]
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:165) ~[spring-context-6.1.11.jar:6.1.11]
... 13 common frames omitted

方案：这个错误是由于存在两个相同名称的 GameController 类导致的。一个在 com.example.gomoku 包中，另一个在 com.example.demo 包中。Spring 无法决定使用哪一个，因此抛出了冲突异常。
要解决这个问题，需要重命名其中一个 GameController 类。

错误信息中最关键的部分是：
Caused by: org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'gameController' for bean class [com.example.gomoku.GameController] conflicts with existing, non-compatible bean definition of same name and class [com.example.demo.GameController]

这个错误信息明确指出了冲突的原因：
有两个名为 'gameController' 的 bean。
一个来自 com.example.gomoku.GameController。
另一个来自 com.example.demo.GameController。
这两个 bean 具有相同的名称但不兼容，导致了冲突。