Add non maven jar in maven way

pom.xml

<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>com.demo.app</groupId>
	<artifactId>demo-app</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<properties>
		<version.maven-install-plugin>2.5.2</version.maven-install-plugin>
		<version.non-maven1>1.0.0</version.non-maven1>
		<version.non-maven2>1.0.0</version.non-maven2>
		<version.non-maven3>1.0.0</version.non-maven3>
	</properties>
	
	<dependencies>
		<dependency>
			<groupId>jar1.group</groupId>
			<artifactId>non-maven1</artifactId>
			<version>${version.non-maven1}</version>
		</dependency>
		<dependency>
			<groupId>jar2.group</groupId>
			<artifactId>non-maven2</artifactId>
			<version>${version.non-maven2}</version>
		</dependency>
		<dependency>
			<groupId>jar3.group</groupId>
			<artifactId>non-maven3</artifactId>
			<version>${version.non-maven3}</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>

			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-install-plugin</artifactId>
				<version>${version.maven-install-plugin}</version>
				<executions>

					<execution>
						<id>install-external-non-maven1-jar</id>
						<phase>clean</phase>
						<configuration>
							<repositoryLayout>default</repositoryLayout>
							<groupId>jar1.group</groupId>
							<artifactId>non-maven1</artifactId>
							<version>${version.non-maven1}</version>
							<file>${project.basedir}/libs/non-maven1.jar</file>
							<packaging>jar</packaging>
							<generatePom>true</generatePom>
						</configuration>
						<goals>
							<goal>install-file</goal>
						</goals>
					</execution>
					<execution>
						<id>install-external-non-maven2-jar</id>
						<phase>clean</phase>
						<configuration>
							<repositoryLayout>default</repositoryLayout>
							<groupId>jar2.group</groupId>
							<artifactId>non-maven2</artifactId>
							<version>${version.non-maven2}</version>
							<file>${project.basedir}/libs/non-maven2.jar</file>
							<packaging>jar</packaging>
							<generatePom>true</generatePom>
						</configuration>
						<goals>
							<goal>install-file</goal>
						</goals>
					</execution>
					<execution>
						<id>install-external-non-maven3-jar</id>
						<phase>clean</phase>
						<configuration>
							<repositoryLayout>default</repositoryLayout>
							<groupId>jar3.group</groupId>
							<artifactId>non-maven3</artifactId>
							<version>${version.non-maven3}</version>
							<file>${project.basedir}/libs/non-maven3.jar</file>
							<packaging>jar</packaging>
							<generatePom>true</generatePom>
						</configuration>
						<goals>
							<goal>install-file</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>
</project>