Plugin execution not covered by lifecycle configuration

refer:

• https://stackoverflow.com/questions/6352208/how-to-solve-plugin-execution-not-covered-by-lifecycle-configuration-for-sprin

• https://stackoverflow.com/questions/19432073/plugin-execution-not-covered-by-lifecycle-configuration-error-in-eclipse-with-pl

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在Eclipse中，在pom文件中，如果加了 execution，会报错误：

Plugin execution not covered by lifecycle configuration: 
org.codehaus.mojo:build-helper-maven-plugin:1.5:add-source (execution: add-source, phase: generate-sources)

问题如下：

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具体解决方案是，将plugins包在 pluginManagement 中:

<pluginManagement>
    <plugins>
       <plugin>
       </plugin>
    </plugins>
</pluginManagement>