The parameters 'mainClass' for goal org.codeh aus.mojo:exec-maven-plugin:1.6.0:java are missing or

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在使用maven插件exec-maven-plugin编译Echo服务器出现

[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java (default-cli) on project zaidunduan: The parameters 'mainClass' for goal org.codehaus.mojo:exec-maven-plugin:1.6.0:java are missing or invalid -> [Help 1]

因为插件还没配置,注意配置引导路径
解决方法:在echo服务器的pom文件添加

<build>    <plugins>        <plugin>            <groupId>org.codehaus.mojo</groupId>            <artifactId>exec-maven-plugin</artifactId>            <version>1.2.1</version>            <executions>                <execution>                    <goals>                        <goal>java</goal>                    </goals>                </execution>            </executions>            <configuration>                <mainClass>client.EchoClient</mainClass>            </configuration>        </plugin>    </plugins></build>
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