Plugins not running in maven project

<?xml version="1.0" encoding="UTF-8"?>

<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>it.unimol.monopoli</groupId>
  <artifactId>monopoli</artifactId>
  <version>1.0</version>

  <name>monopoli</name>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.9</maven.compiler.source>
    <maven.compiler.target>1.9</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.13.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <distributionManagement>
    <repository>
      <id>deploy.repo</id>
      <name>Deploy repository</name>
      <url>file://..\deploy\</url>
    </repository>
  </distributionManagement>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-site-plugin</artifactId>
        <version>3.7.1</version>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-project-info-reports-plugin</artifactId>
        <version>3.0.0</version>
      </plugin>

      <plugin>
        <artifactId>maven-jar-plugin</artifactId>
        <version>3.0.2</version>
        <configuration>
          <archive>
            <manifest>
              <addClasspath>true</addClasspath>
              <classpathPrefix>target/classes/</classpathPrefix>
              <mainClass>it.unimol.monopoli.MainGui</mainClass>
            </manifest>
          </archive>
        </configuration>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-checkstyle-plugin</artifactId>
        <version>3.2.0</version>
        <configuration>
          <configLocation>checkstyle.xml</configLocation>
          <consoleOutput>true</consoleOutput>
          <failsOnError>true</failsOnError>
          <failOnViolation>false</failOnViolation>
        </configuration>
        <executions>
          <execution>
            <?m2e execute onConfiguration,onIncremental?>
            <id>validate</id>
            <phase>validate</phase>
            <goals>
              <goal>check</goal>
            </goals>
          </execution>
        </executions>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-pmd-plugin</artifactId>
        <version>3.20.0</version>
      </plugin>

      <plugin>
        <groupId>com.github.spotbugs</groupId>
        <artifactId>spotbugs-maven-plugin</artifactId>
        <version>4.7.3.0</version>
        <configuration>
          <xmlOutput>true</xmlOutput>
          <xmlOutputDirectory>target/site</xmlOutputDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>
    
  <reporting>
    <plugins>
      <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-jxr-plugin</artifactId>
          <version>3.3.0</version>
      </plugin>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-pmd-plugin</artifactId>
        <version>3.20.0</version>
        <configuration>
          <linkXref>true</linkXref>
          <inputEncoding>utf-8</inputEncoding>
          <minimumTokens>100</minimumTokens>
          <targetJdk>1.5</targetJdk>
          <excludes>
            <exclude>**/*Bean.java</exclude>
            <exclude>**/generated/*.java</exclude>
          </excludes>
          <excludeRoots>
            <excludeRoot>target/generated-sources/stubs</excludeRoot>
          </excludeRoots>
        </configuration>
        <reportSets>
          <reportSet>
            <reports>
              <report>pmd</report>
              <report>cpd</report>
            </reports>
          </reportSet>
          <reportSet>
            <id>aggregate</id>
            <inherited>false</inherited>
            <reports>
              <report>aggregate-pmd</report>
              <report>aggregate-cpd</report>
            </reports>
          </reportSet>
        </reportSets>
      </plugin>

      <plugin>
        <groupId>com.github.spotbugs</groupId>
        <artifactId>spotbugs-maven-plugin</artifactId>
        <version>4.7.3.0</version>
      </plugin>

    </plugins>
  </reporting>
</project>