SpringBoot启动报错：排除常见错误后，解决方案来了！

SpringBoot 启动时报过的那些奇葩错

SpringBoot 作为当今流行的 Java 框架，以其轻量级、易上手的特点深受开发者喜爱。然而，在实际开发过程中，我们难免会遇到各种各样的启动错误，让人头疼不已。今天，我们就来盘点一下那些年 SpringBoot 启动时遇到的奇葩报错，并探讨如何解决它们。

一、命名空间错误

当 SpringBoot 项目中有多个命名空间时，启动时可能会遇到类似这样的报错：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'xxxController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.example.demo.service.UserService com.example.demo.controller.UserController.userService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.demo.service.UserService' available: expected at least 1 bean which qualifies as autowire candidate for this dependency

这种错误通常是由于没有正确配置命名空间造成的。解决方法是在 SpringBoot 启动类中添加以下代码：

@ComponentScan(basePackages = {"com.example.demo.controller", "com.example.demo.service"})

通过该注解，SpringBoot 会扫描指定的包及其子包，并自动装配其中的 Bean。

二、包扫描错误

如果没有正确配置包扫描，SpringBoot 启动时可能会遇到类似这样的报错：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'xxxController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.example.demo.service.UserService com.example.demo.controller.UserController.userService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.example.demo.service.UserService' available: expected at least 1 bean which qualifies as autowire candidate for this dependency

这种错误通常是由于没有正确配置包扫描路径造成的。解决方法是在 SpringBoot 启动类中添加以下代码：

@SpringBootApplication(scanBasePackages = {"com.example.demo.controller", "com.example.demo.service"})

通过该注解，SpringBoot 会自动扫描所有标注了 @SpringBootApplication 注解的类及其所在包，并自动装配其中的 Bean。

三、mapper 错误

如果没有正确配置 MyBatis mapper，SpringBoot 启动时可能会遇到类似这样的报错：

Caused by: org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.binding.BindingException: Parameter 'xxx' not found. Available parameters are [arg0, arg1, param1, param2]

这种错误通常是由于没有正确配置 mapper 的包扫描路径造成的。解决方法是在 SpringBoot 启动类中添加以下代码：

@MapperScan("com.example.demo.mapper")

通过该注解，SpringBoot 会扫描指定的包及其子包，并自动注册其中的 mapper 接口。

四、xml 格式错误

如果没有正确配置 MyBatis xml 文件，SpringBoot 启动时可能会遇到类似这样的报错：

Caused by: org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. Cause: org.apache.】写一篇相关的博客，写作要求：100%独特、SEO优化的文章，包含子标题，并覆盖提示中提供的主题。请用自己的话来写文章，而不是从其他来源复制和粘贴。在创建内容时，一定要考虑复杂性和连贯性，确保两者都很高，同时不失特定性和上下文。请使用充分详细的段落来吸引读者，并以人类写作的对话风格写作。这包括使用非正式的语气，利用人称代词，保持简单、吸引读者，使用主动语态，简洁明了，使用修辞问题，并融入比喻和隐喻。最后，以结论段落和5个独特的常见问题解答结束文章。请务必加粗文章的所有标题。
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