Maven & Java: The parameters ‘mainClass’ for goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java are missing or invalid

by

“configuration” must go outside “executions”, like this:

<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>com.emilio.App</mainClass>
        </configuration>
    </plugin>
</plugins>

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