Full error:
The problem revolves around mapper. There may be many reasons for the problem:
1. The control document is written incorrectly
2. The file generated after compilation does not contain XML file
Solution: manually specify the resource folder in the pop file
<!-- Manually specify the resource folder-->
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
</resources>