备忘：maven 错误信息： Plugin execution not covered by lifecycle configuration

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>mymaven</groupId>
  <artifactId>mymaven</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <dependencies>
   <dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate</artifactId>
    <version>3.5.4-Final</version>
    <type>pom</type>
   </dependency>
   <dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-annotations</artifactId>
    <version>3.5.4-Final</version>
   </dependency>
   <dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-core</artifactId>
    <version>3.5.4-Final</version>
   </dependency>
   <dependency>
    <groupId>org.javassist</groupId>
    <artifactId>javassist</artifactId>
    <version>3.18.2-GA</version>
   </dependency>
   <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-api</artifactId>
    <version>1.7.7</version>
   </dependency>
   <dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-classic</artifactId>
    <version>1.1.2</version>
   </dependency>
   <dependency>
    <groupId>ch.qos.logback</groupId>
    <artifactId>logback-core</artifactId>
    <version>1.1.2</version>
   </dependency>
   <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.31</version>
   </dependency>
   <dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.2.7</version>
   </dependency>
  </dependencies>
  <build>
   
    <plugins>
         <plugin>
          <groupId>org.mybatis.generator</groupId>
          <artifactId>mybatis-generator-maven-plugin</artifactId>
           <version>1.3.1</version>
               <configuration> 
                   <verbose>true</verbose> 
                   <overwrite>true</overwrite> 
               </configuration> 
           <executions>
             <execution>
               <id>Generate MyBatis Artifacts</id>
               <goals>
                 <goal>generate</goal>
               </goals>
             </execution>
           </executions>
         </plugin>
      </plugins>
  </build>
</project>

红字出错了。错误信息是：Plugin execution not covered by lifecycle configuration. 在网上找了一些解决方案，结果是把plugins包括在pluginManagement里。

<pluginManagement>