maven-dependency-plugin (goals "copy-dependencies", "unpack") is not supported by m2e.

在maven项目构建时pom.xml文件报错：maven-dependency-plugin (goals "copy-dependencies", "unpack") is not supported by m2e.

报错部分配置如下：

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1. <plugin>  
2.                <artifactId>maven-dependency-plugin</artifactId>  
3.                <version>2.6</version>  
4.                <executions>  
5.                    <execution>  
6.                        <id>copy-dependencies</id>  
7.                        <phase>package</phase>  
8.                        <goals>  
9.                            <goal>copy-dependencies</goal>  
10.                        </goals>  
11.                        <configuration>  
12.                            <outputDirectory>${project.build.directory}/lib</outputDirectory>  
13.                            <overWriteReleases>false</overWriteReleases>  
14.                            <overWriteSnapshots>false</overWriteSnapshots>  
15.                            <overWriteIfNewer>true</overWriteIfNewer>  
16.                            <excludeTransitive>true</excludeTransitive>  
17.                        </configuration>  
18.                    </execution>  
19.                </executions>  
20.            </plugin>  

最终研究得出的原因是Eclipse的M2E插件没有覆盖到这样的execution，为了解决这个问题，我们需要让其在maven的生命周期里不被识别，同时让M2e插件能认识、执行它。

我们需要在build标签里面，在plugins标签前面，加如下配置即可：

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1. <pluginManagement>  
2.  <plugins>  
3.    <plugin>  
4.      <groupId>org.eclipse.m2e</groupId>  
5.      <artifactId>lifecycle-mapping</artifactId>  
6.      <version>1.0.0</version>  
7.      <configuration>  
8.        <lifecycleMappingMetadata>  
9.          <pluginExecutions>  
10.            <pluginExecution>  
11.              <pluginExecutionFilter>  
12.                <groupId>org.apache.maven.plugins</groupId>  
13.                <artifactId>maven-dependency-plugin</artifactId>  
14.                <versionRange>2.6</versionRange>  
15.                <goals>  
16.                  <goal>copy-dependencies</goal>  
17.                </goals>  
18.              </pluginExecutionFilter>  
19.              <action>  
20.                <execute />  
21.              </action>  
22.            </pluginExecution>  
23.          </pluginExecutions>  
24.        </lifecycleMappingMetadata>  
25.      </configuration>  
26.    </plugin>  
27.  </plugins>  
28. </pluginManagement>  

备注:注意顺序!

原文网址：http://blog.csdn.net/xufaxi/article/details/45021129