Unrecognised tag: 'snapshotPolicy'

问题：[WARNING] Unrecognised tag: 'snapshotPolicy' (position: START_TAG seen ...</layout>          <snapshotPolicy>... @286:27)  @ D:maven-3.6.1in..confsettings.xml, line 286, column 27

出错位置：

    <profile>
      
      <id>jdk-1.7</id>

      <activation>
        <jdk>1.7</jdk>
      </activation>

      <repositories>
        <repository>
          <id>jdk17</id>
          <name>Repository for JDK 1.7 builds</name>
          <url>http://www.myhost.com/maven/jdk17</url>
          <layout>default</layout>
          <snapshotPolicy>always</snapshotPolicy>
        </repository>
      </repositories>
    </profile>

解决方法，将该段替换为：

<profile>
      <id>nexus</id>
        <activation>
            <activeByDefault>true</activeByDefault>
        </activation>
        <repositories>
            <repository>
                <id>nexus</id>
                <name>Nexus</name>
                <url>http://172.16.1.79:8082/repository/maven-public/</url>
 
                <releases>
                    <enabled>true</enabled>
                    <updatePolicy>always</updatePolicy>
                </releases>
                <snapshots>
                    <enabled>true</enabled>
                    <updatePolicy>daily</updatePolicy>
                </snapshots>
            </repository>
        </repositories>
    </profile>

不要问我为什么，我也不知道。。。