maven profile can't get the site.url

Question

working with java project with Maven and TestNG. Trying to put environment variables into maven profiles and call them on with mvn clean install -Pdevhost

The problen is that browser can't get a siteurl. Error:

java.lang.NullPointerException: null value in entry: url=null

Pom file profiles:

  <build>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.7.0</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>2.21.0</version>
            <configuration>
                <suiteXmlFiles>
                    <file>${project.basedir}/suites/smoke.xml</file>
                </suiteXmlFiles>
                <systemPropertyVariables>
                    <environment.properties>/environment.properties</environment.properties>
                </systemPropertyVariables>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
    <testResources>
        <testResource>
            <directory>src\test\resources</directory>
            <filtering>true</filtering>
        </testResource>
    </testResources>

    <resources>
        <resource>
            <directory>src\test\resources</directory>
            <filtering>true</filtering>
        </resource>
    </resources>

</build>

    <!-- Profiles configuration -->
    <profiles>

        <!--Environments "mvn test -P dev3"-->

        <profile>
            <id>devhost</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <properties>
                <site.url>https://siteurl.com</site.url>
            </properties>
        </profile>
</profiles>

The file with properties called as "environment.properties" file and is located under src/test/resources:

site.url=${site.url}

Java class where driver gets the siteurl:

public void SetUp() {


    driver = new ChromeDriver();
    System.setProperty("webdriver.chrome.driver", 
    ConfigFileReader.getDriverPath());

    driver.manage().window().maximize();

    driver.get(System.getProperty("site.url"));

    driver.manage().timeouts().implicitlyWait(40, TimeUnit.SECONDS);

Answer 1

Added property loader into java class.

 PropertyLoader config = new PropertyLoader();
 baseUrl = config.getProperty("site.url");
 driver.get(baseUrl);