eclipse - 如何在 Eclipse 中使用 Maven exec 插件？

Question

我是 Maven 的新手，我正在尝试使用 exec:java 运行一个项目.我的构建失败了，大概是因为我没有 exec 插件。我下载了插件 ( http://mvnrepository.com/artifact/org.codehaus.mojo/exec-maven-plugin )，但现在我不知道如何处理它才能在 Eclipse 中使用它。我尝试将它添加到构建路径中，但这似乎不起作用。这可能是一个非常愚蠢的问题，但我如何让插件工作？

这是我的构建输出:

[INFO] Scanning for projects...
[INFO] 
[INFO] Using the builder org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder with a thread count of 1
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Twitter2 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- exec-maven-plugin:1.4.0:java (default-cli) @ Twitter2 ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.826 s
[INFO] Finished at: 2015-06-11T14:24:29-06:00
[INFO] Final Memory: 10M/114M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.4.0:java (default-cli) on project Twitter2: The parameters 'mainClass' for goal org.codehaus.mojo:exec-maven-plugin:1.4.0:java are missing or invalid -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginParameterException

Answer 1

正如错误所说，似乎是 mainClass告诉插件运行哪个类的参数设置不正确。见 http://www.mojohaus.org/exec-maven-plugin/java-mojo.html用于 java 的用法插件的目标。尝试在 POM 配置中添加参数:

<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>exec-maven-plugin</artifactId>
    <configuration>
         <mainClass>fully.qualified.class.name</mainClass>
    </configuration>
</plugin>

或通过属性(property) -Dexec.mainClass=fullClassName在命令行中。