SB了!给注解的数组属性赋值，我竟然...

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项目中用到了mybatis-plus。springboot集成mybatis-plus项目，通常会使用内置mybatis工具包的org.mybatis.spring.annotation.MapperScan注解，来完成Mapper类的扫描。MapperScan注解源码见下。

public @interface MapperScan {/*** Alias for the {@link #basePackages()} attribute. Allows for more concise* annotation declarations e.g.:* {@code @MapperScan("org.my.pkg")} instead of {@code @MapperScan(basePackages = "org.my.pkg"})}.** @return base package names*/String[] value() default {};/*** Base packages to scan for MyBatis interfaces. * Note that only interfaces with at least one method will be registered; concrete classes will be ignored.* 翻译：用于扫描MyBatis接口的基础package（可多个）。请注意，只有具有至少一个方法的接口才会被注册；具体类将被忽略。** @return base package names for scanning mapper interface*/String[] basePackages() default {};
}

项目使用这个MapperScan注解来决定扫描Mapper类所在的包。见下方MybatisPlusConfig配置类。

package springtrans;import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;@Configuration
@MapperScan(value={"springtrans.**.mapper"})
public class MybatisPlusConfig {/***  分页插件*/@Beanpublic PaginationInterceptor paginationInterceptor() {// 设置sql的limit为无限制，默认是500return new PaginationInterceptor().setLimit(-1);}}

近期在对项目中的结算代码进行优化，这里，我们先设定结算表仓储类名称是SettlementMapper。这次重构涉及到需要屏蔽SettlementMapper的update操作。实现途径是将SettlementMapper从现有package移出去，并且让mybatis-plus追加扫描SettlementMapper所在的package。

于是，修改MybatisPlusConfig中MapperScan的value值。

@Configuration
@MapperScan(value={"springtrans.**.mapper, springtrans.transtest.manager"})
public class MybatisPlusConfig {...
}

不料，运行testcase出现了下面的NoSuchBeanDefinitionException异常。

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'springtrans.transtest.entity.OrderMapper' available: 
expected at least 1 bean which qualifies as autowire candidate. 
Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1695)at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1253)at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207)at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:636)... 44 more

聪明的你，是不是看出了其中的端倪？

哈哈，我竟然犯了如此低级失误。
正确姿势是：

@Configuration
@MapperScan(value={"springtrans.**.mapper", "springtrans.transtest.manager"})
public class MybatisPlusConfig {...
}

EOF，感谢阅读！

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