无法加载Java的Maven Socket.IO客户端

Question

我对Maven很陌生。我执行了使用Maven编译的jar文件，而Spigot节已正确编译并执行，而Socket.IO依赖项却没有。编译时未显示任何错误，但在执行时显示： java.lang.NoClassDefFoundError：io / socket / client / IO

这是我的POM：

<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>lutton</groupId>
<artifactId>discordmc</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>discordmc</name>
<url>http://maven.apache.org</url>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.6</maven.compiler.source>
    <maven.compiler.target>1.6</maven.compiler.target>
</properties>

<dependencies>
    <dependency>
        <groupId>io.socket</groupId>
        <artifactId>socket.io-client</artifactId>
        <version>1.0.0</version>
    </dependency>
    <dependency>
        <groupId>org.spigotmc</groupId>
        <artifactId>spigot-api</artifactId>
        <version>1.12.2-R0.1-SNAPSHOT</version>
        <scope>provided</scope>
    </dependency>
</dependencies>

<build>
    <resources>
        <resource>
            <directory></directory>
            <includes>
                <include>plugin.yml</include>
            </includes>
        </resource>
    </resources>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.3</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
    </plugins>
</build>