在maven项目中使用add-source时，pom.xml报如下错误：
Plugin execution not covered by lifecycle configuration: org.codehaus.mojo:build-helper-maven-plugin:1.8:add-source (execution: add-source, phase: generate-sources)
加入的代码如下：
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>1.8</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>${basedir}/src/main/entity</source>
<source>${basedir}/src/main/modules</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
原因是eclipse的m2e插件还没支持到execution，解决办法如下
在pom.xml文件中，<plugins></plugins>后加入如下代码：
<pluginManagement>
<plugins>
<!--This plugin's configuration is used to store Eclipse m2e settings only. It has no influence on the Maven build itself.-->
<plugin>
<groupId>org.eclipse.m2e</groupId>
<artifactId>lifecycle-mapping</artifactId>
<version>1.0.0</version>
<configuration>
<lifecycleMappingMetadata>
<pluginExecutions>
<pluginExecution>
<pluginExecutionFilter>
<groupId>
org.codehaus.mojo
</groupId>
<artifactId>
build-helper-maven-plugin
</artifactId>
<versionRange>
[1.8,)
</versionRange>
<goals>
<goal>add-source</goal>
</goals>
</pluginExecutionFilter>
<action>
<ignore></ignore>
</action>
</pluginExecution>
</pluginExecutions>
</lifecycleMappingMetadata>
</configuration>
</plugin>
</plugins>
</pluginManagement>
然后maven -> Update Project 即可