问题

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.zjp.mapper.UserMapper.selectAll

application.yml

mybatis-plus:
  mapper-locations:
  - com.zjp.mapper/*.xml

启动类

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.zjp.mapper")
public class app {
     public static void main(String[] args) {
           SpringApplication.run(app.class, args);
      }
}

解决方案

在pom文件中增加配置

 <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*</include>
                </includes>
            </resource>
        </resources>
    </build>

后记

如果不是上述情况多半是扫描mapper时路径错误的问题