Build your project with Maven and use that kind of pom.xml:
<?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>tld.group</groupId>
    <artifactId>artifact</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>artifact</name>
    <description>My artifact</description>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>11</java.version>
        <javafx.main.class>your.package.YourJavaFxAppMainClass</javafx.main.class>
        <main.class>your.package.YourMainClass</main.class>
    </properties>
    
    <dependencies>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-controls</artifactId>
            <version>11.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-graphics</artifactId>
            <version>11.0.2</version>
            <classifier>win</classifier>
        </dependency>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-fxml</artifactId>
            <version>11.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-web</artifactId>
            <version>11.0.2</version>
        </dependency>
    </dependencies>
    
    <build>
        <!-- Jar's final name -->
        <finalName>${project.artifactId}</finalName>
        <plugins>
            <!-- Build source and target -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <compilerArgs>
                        <!--<arg>--add-modules=java.smartcardio</arg>-->
                    </compilerArgs>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <showDeprecation>true</showDeprecation>
                    <showWarnings>true</showWarnings>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-maven-plugin</artifactId>
                <version>0.0.4</version>
                <configuration>
                    <mainClass>${javafx.main.class}</mainClass>
                </configuration>
            </plugin>
            <!-- Distributable archive building -->
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <!-- Main class -->
                            <mainClass>${main.class}</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <!--  Includes project's dependencies -->
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                    <appendAssemblyId>false</appendAssemblyId>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>
You have to provide two application classes.
The Javafx one:
public class YourJavaFxAppMainClass extends javafx.application.Application {
    @Override
    public void start(Stage stage) throws IOException {
        // ...
    }
    public static void main(String[] args) {
        launch();
    }
    // ...
}
The other which is used to run your program from your IDE (for instance IntelliJ):
public class YourMainClass {
    public static void main(final String[] args) {
        YourJavaFxAppMainClass.main(args);
    }
}
Then you can package your jar using mvn clean package and run it with java -jar target/artifact.jar.