This is my module:

module DEMO {
    requires javafx.graphics;
    requires javafx.controls;
    requires javafx.fxml;
    requires javafx.swing;
    requires java.desktop;
    requires org.apache.pdfbox;

    opens org.example to javafx.fxml;
    opens controller to javafx.fxml;

    exports org.example;

}

This is my 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>org.example</groupId>
    <artifactId>DEMO</artifactId>
    <version>1.0-SNAPSHOT</version>
    <name>DEMO</name>

    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <javafx.version>20</javafx.version> <!-- Updated to the latest version -->
        <pdfbox.version>2.0.28</pdfbox.version>
    </properties>

    <dependencies>
        <!-- JavaFX dependencies -->
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-controls</artifactId>
            <version>${javafx.version}</version>
        </dependency>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-fxml</artifactId>
            <version>${javafx.version}</version>
        </dependency>
        <dependency>
            <groupId>org.openjfx</groupId>
            <artifactId>javafx-swing</artifactId>
            <version>${javafx.version}</version>
        </dependency>
        <!-- Apache PDFBox dependency -->
        <dependency>
            <groupId>org.apache.pdfbox</groupId>
            <artifactId>pdfbox</artifactId>
            <version>${pdfbox.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.13.0</version>
                <configuration>
                    <source>17</source>
                    <target>17</target>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>3.6.0</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <artifactSet>
                                <excludes>
                                    <exclude>junit:junit</exclude>
                                    <exclude>jmock:*</exclude>
                                    <exclude>*:xml-apis</exclude>
                                    <exclude>org.apache.maven:lib:tests</exclude>
                                    <exclude>org.apache.logging.log4j:log4j-core</exclude>
                                    <exclude>org.apache.logging.log4j:log4j-api</exclude>
                                </excludes>
                            </artifactSet>
                            <filters>
                                <filter>
                                    <artifact>*:*</artifact>
                                    <excludes>
                                        <exclude>META-INF/*.SF</exclude>
                                        <exclude>META-INF/*.DSA</exclude>
                                        <exclude>META-INF/*.RSA</exclude>
                                        <exclude>META-INF/substrate/config/*.json</exclude> <!-- Exclude conflicting resources -->
                                    </excludes>
                                </filter>
                            </filters>
                            <transformers>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass>org.example.TocParserApplication</mainClass>
                                </transformer>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-maven-plugin</artifactId>
                <version>0.0.8</version> <!-- Updated to the latest version -->
                <configuration>
                    <mainClass>org.example.TocParserApplication</mainClass> <!-- Replace with your main class -->
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>run</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

And when I’m using this command:
java -jar target/DEMO-1.0-SNAPSHOT.jar

This is what is showing:
Error: JavaFX runtime components are missing, and are required to run this application

I am expecting an outcome for an executable file in JAR FILE. I also maven command.