Unrecognised tag: snapshotPolicy (position: START

在对SpringBoot应用程序进行打包的过程中，报了这个错
在对应的setting.xml中，报错的代码为：

   <profile>  <id>spring plugins</id>  <activation>  <jdk>spring plugins</jdk>  </activation>  <pluginRepositories>  <pluginRepository>  <id>spring plugins</id>  <name>Spring plugins</name>  <url>https://maven.aliyun.com/repository/spring-plugin</url>  <layout>default</layout>  <snapshotPolicy>always</snapshotPolicy></pluginRepository>  </pluginRepositories>  </profile>

将其更改为：

   <profile>  <id>spring plugins</id>  <activation>  <jdk>spring plugins</jdk>  </activation>  <pluginRepositories>  <pluginRepository>  <id>spring plugins</id>  <name>Spring plugins</name>  <url>https://maven.aliyun.com/repository/spring-plugin</url>  <layout>default</layout>  <snapshots><enabled>true</enabled><updatePolicy>daily</updatePolicy></snapshots></pluginRepository>  </pluginRepositories>  </profile>

和CSDN以及StackOverFlow上的代码不一样，但核心一致的，大概就是snapShot标签的写法，我按照别人的代码发现无法解决问题，于是自己更改了标签的写法。

但是之后报：
No goals have been specified for this build. You must specify a valid lifecycle phase or a goal in 这个错
解决方式是在pom.xml文件中指定build的目标：<defaultGoal>package</defaultGoal>
完整代码如下：

    <build><defaultGoal>package</defaultGoal><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>

问题解决，生成jar包

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