[Question] Cannot find local jar class after maven package

[Meltryllis163]

Summary:
When I run the package exe file with local jar, I get exception info below (My system is Microsoft Windows
Version24H2 26100.3775)

E:\CodeProjects\Java\NovelFormatterFX\target\NovelFormatter>NovelFormatter.exe
May 04, 2025 5:45:12 PM com.sun.javafx.application.PlatformImpl startup
警告: Unsupported JavaFX configuration: classes were loaded from 'unnamed module @2928854b'
Exception in Application start method
Exception in thread "main" java.lang.RuntimeException: Exception in Application start method
        at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:893)
        at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:196)
        at java.base/java.lang.Thread.run(Unknown Source)

// Here is my question
Caused by: java.lang.NoClassDefFoundError: xss/it/nfx/NfxWindow
        at cc.meltryllis.nf.ui.MainApplication.start(MainApplication.java:45)
        at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:839)
        at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:483)
        at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:456)
        at java.base/java.security.AccessController.doPrivileged(Unknown Source)
        at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:455)
        at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
        at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
        at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:184)
        ... 1 more
Caused by: java.lang.ClassNotFoundException: xss.it.nfx.NfxWindow
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
        at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
        ... 10 more

Detail:
I want to import a local jar nfx-core-1.0.2.jar to my maven project.
Here 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cc.meltryllis</groupId>
    <artifactId>NovelFormatterFX</artifactId>
    <version>1.2.1</version>
    <name>NovelFormatter</name>
    <description>JavaFX Novel Formatter.</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <junit.version>5.10.2</junit.version>
    </properties>

    <dependencies>
        ......
        <dependency>
            <groupId>xss.it.nfx</groupId>
            <artifactId>nfx-core</artifactId>
            <version>1.0.2</version>
            <scope>system</scope>
            <systemPath>${project.basedir}/libs/nfx-core-1.0.2.jar</systemPath>
        </dependency>
    </dependencies>

    <build>
        ......
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.13.0</version>
                <configuration>
                    <source>21</source>
                    <target>21</target>
                    <annotationProcessorPaths>
                        <!-- 这里必须声明lombok，否则编译时lombok会无效 -->
                        <path>
                            <groupId>org.projectLombok</groupId>
                            <artifactId>lombok</artifactId>
                            <version>1.18.36</version>
                        </path>
                    </annotationProcessorPaths>
                    <compilerArguments>
                        <extdirs>${project.basedir}/libs</extdirs>
                    </compilerArguments>
                </configuration>
            </plugin>
            <plugin>
                <groupId>io.github.fvarrui</groupId>
                <artifactId>javapackager</artifactId>
                <version>1.7.6</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>package</goal>
                        </goals>
                        <configuration>
                            <!-- 必须 -->
                            <mainClass>cc.meltryllis.nf.Main</mainClass>
                            <!-- 可选 -->
                            <bundleJre>true</bundleJre>
                            <generateInstaller>false</generateInstaller>
                            <url>https://github.com/Meltryllis163/NovelFormatterFX</url>
                            <licenseFile>${basedir}/LICENSE</licenseFile>
                            <winConfig>
                                <copyright>Github@Meltryllis163</copyright>
                                <generateSetup>false</generateSetup>
                                <generateMsi>false</generateMsi>
                                <generateMsm>false</generateMsm>
                                <fileVersion>${project.version}.0</fileVersion>
                                <productVersion>${project.version}.0</productVersion>
                                <!-- 用于开启控制台，然后在CMD窗口中输入NovelFormatter.exe，运行EXE程序来查看控制台 -->
                                <headerType>console</headerType>
                            </winConfig>
                            <additionalModules>
                                <!-- 详见 https://github.com/fvarrui/JavaPackager/issues/429 -->
                                <additionalModule>java.naming</additionalModule>
                                <!-- 否则找不到GBK2312字符集 -->
                                <additionalModule>jdk.charsets</additionalModule>
                            </additionalModules>
                            <additionalResources>
                                <additionalResource>${project.basedir}/libs</additionalResource>
                            </additionalResources>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.openjfx</groupId>
                <artifactId>javafx-maven-plugin</artifactId>
                <version>0.0.8</version>
                <configuration>
                    <!-- 格式：模块/主类 -->
                    <mainClass>cc.meltryllis.nf/cc.meltryllis.nf.Main</mainClass>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

Some situations I tried:

• If I run it in IDEA, the program is fine. But if I package and then run exe, it can't find nfx-core.jar.
• You can get the complete project from the package-test branch

[Meltryllis163]

I have achieved my goal by installing this jar into my local maven repository, so this problem is not urgent :) I just want to know why the above method does not work.