Spring MVC and minify-maven-plugin does not recognize the <id> - spring

Question

I have a running project with Spring MVC.
I'm trying to use the minify-maven-plugin.
I did the download of his sample project and based on the configuration the project I did mine. My pom.xml looked like this:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>MeuProjeto</groupId>
<artifactId>MeuProjeto</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4</version>
<configuration>
<descriptorRefs>
<descriptorRef>src</descriptorRef>
</descriptorRefs>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>2.4</version>
<configuration>
<warSourceExcludes>
**/font-awesome.css,**/magnific-popup.css,**/util.js,**/vuid.min.js
</warSourceExcludes>
</configuration>
</plugin>
<plugin>
<groupId>com.samaxes.maven</groupId>
<artifactId>minify-maven-plugin</artifactId>
<version>1.7.4</version>
<executions>
<id>default-minify</id>
<configuration>
<cssSourceFiles>
<cssSourceFile>font-awesome.css</cssSourceFile>
<cssSourceFile>magnific-popup.css</cssSourceFile>
</cssSourceFiles>
<jsSourceFiles>
<jsSourceFile>util.js</jsSourceFile>
<jsSourceFile>vuid.min.js</jsSourceFile>
</jsSourceFiles>
<jsEngine>CLOSURE</jsEngine>
<closureCreateSourceMap>true</closureCreateSourceMap>
</configuration>
<goals>
<goal>minify</goal>
</goals>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>4.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.1.3</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.2.0</version>
<exclusions>
<exclusion>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>2.1.1</version>
</dependency>
</dependencies>
</project>
The problem is that it is accusing error in this line of pom.xml:
default-minify
Error:
Description Resource Path Location Type cvc-complex-type.2.4.a: Invalid content was found starting with element 'id'. One of '{"http://maven.apache.org/POM/4.0.0":execution}' is expected. pom.xml /MeuProjeto line 53 XML Problem
What am I missing? I can not understand his reason for not accepting that tag.

Answer 1

Ok.. my falt
I forget the <execution> tag.
<executions>
<execution>
<id>default-minify</id>
<configuration>
Including tag it works.