No qualifying bean of type 'mapper.BookMapper' available: expected at least 1 bean which qualifies as autowire candidate.

该错误信息表明在Spring应用程序中找不到符合自动装配条件的BookMapper bean。这可能是由于以下原因:

1. 未正确配置BookMapper bean。请确保在Spring配置文件或启动类中添加了正确的配置，以便创建并注册BookMapper bean。

2. BookMapper接口或实现类可能没有被正确扫描到。请检查是否在启动类上添加了@MapperScan注解，并指定了正确的mapper包路径。

3. BookMapper所在的包路径没有被包含在mybatis-plus.mapper-locations配置中。请确保在配置文件中正确设置了mapper-locations属性，以指定mapper接口的XML文件位置。

解决此问题的方法是:

1. 确保已正确配置BookMapper bean。可以通过在启动类上添加@MapperScan注解，并指定正确的mapper包路径来扫描并创建BookMapper bean。

2. 检查BookMapper接口或实现类是否正确扫描到。可以通过查看日志或调试来确认是否成功注册了BookMapper bean。

3. 确保mybatis-plus.mapper-locations属性正确设置了mapper接口的XML文件位置。可以在配置文件中添加如下配置：

mybatis-plus.mapper-locations=classpath:com/example/book/mapper/xml/*.xml

这将告诉MyBatis-Plus框架在指定路径下查找mapper接口的XML文件。

通过以上方法，您应该能够解决"No qualifying bean of type 'mapper.BookMapper' available"的错误。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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