使用Java 9模块（JPMS）时java.lang.NoSuchMethodError

Question

我正在尝试使用JPMS模块将JavaFX，Spring Boot和VLCJ结合在一起。如果没有Spring Boot，则在我的module-info.java文件中一切正常：

module myapplication.module {
    requires javafx.controls;
    requires javafx.fxml;
    requires javafx.web;
    requires vlcj;

    requires org.kordamp.iconli.core;
    requires org.kordamp.ikonli.javafx;
    requires org.kordamp.ikonli.fontawesome5;

    exports com.company.app;
}

但是，如果现在结合使用Spring Boot，则我将其更新module-info.java为包括Spring相关模块：

    requires spring.beans;
    requires spring.context;
    requires spring.core;
    requires spring.boot.autoconfigure;
    requires spring.boot;

但是，我在运行时遇到此异常：

java.lang.NoSuchMethodError: com.sun.jna.Native.load(Ljava/lang/String;Ljava/lang/Class;)Lcom/sun/jna/Library;
    at vlcj.natives@4.1.0/uk.co.caprica.vlcj.binding.LibC.<clinit>(LibC.java:38)
    at vlcj@4.2.0/uk.co.caprica.vlcj.factory.discovery.strategy.OsxNativeDiscoveryStrategy.setPluginPath(OsxNativeDiscoveryStrategy.java:72)
    at vlcj@4.2.0/uk.co.caprica.vlcj.factory.discovery.strategy.BaseNativeDiscoveryStrategy.onSetPluginPath(BaseNativeDiscoveryStrategy.java:126)
    at vlcj@4.2.0/uk.co.caprica.vlcj.factory.discovery.NativeDiscovery.tryPluginPath(NativeDiscovery.java:176)
    at vlcj@4.2.0/uk.co.caprica.vlcj.factory.discovery.NativeDiscovery.discover(NativeDiscovery.java:117)
    at vlcj@4.2.0/uk.co.caprica.vlcj.factory.MediaPlayerFactory.discoverNativeLibrary(MediaPlayerFactory.java:187)
    at vlcj@4.2.0/uk.co.caprica.vlcj.factory.MediaPlayerFactory.<init>(MediaPlayerFactory.java:119)
    at vlcj@4.2.0/uk.co.caprica.vlcj.factory.MediaPlayerFactory.<init>(MediaPlayerFactory.java:174)
    at myapplication.module/com.company.app.MyApplication.mediaPlayerFactory(MyApplicationConfiguration.java:18)
    at myapplication.module/com.company.app.MyApplication$$EnhancerBySpringCGLIB$$702eae01.CGLIB$mediaPlayerFactory$0(<generated>)
    at myapplication.module/com.company.app.MyApplication$$EnhancerBySpringCGLIB$$702eae01$$FastClassBySpringCGLIB$$af782040.invoke(<generated>)
    at spring.core@5.1.9.RELEASE/org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244)
    at spring.context@5.1.9.RELEASE/org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363)
    at myapplication.module/com.company.app.MyApplication$$EnhancerBySpringCGLIB$$702eae01.mediaPlayerFactory(<generated>)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at spring.beans@5.1.9.RELEASE/org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
    ... 34 more

com.sun.jna.Native 是属于依赖项树的类，因为它是VLCJ的可传递依赖项：

[INFO] +- uk.co.caprica:vlcj:jar:4.2.0:compile
[INFO] |  \- uk.co.caprica:vlcj-natives:jar:4.1.0:compile
[INFO] |     +- net.java.dev.jna:jna:jar:4.5.2:compile
[INFO] |     \- net.java.dev.jna:jna-platform:jar:4.5.2:compile

我也尝试添加requires jna;模块描述符，但这不会改变任何内容。

Answer 1

发布问题 10 分钟后我自己找到了答案:-)

问题不在于 Java 模块系统，而在于 Spring Boot 引入的 JNA 版本比 VLCJ 所需的版本更旧。不知道为什么 Maven 决定这样做，也不知道为什么 Spring Boot 声明 JNA 版本，但添加依赖项显式修复了它：

        <dependency>
            <groupId>net.java.dev.jna</groupId>
            <artifactId>jna</artifactId>
            <version>5.4.0</version>
        </dependency>
        <dependency>
            <groupId>net.java.dev.jna</groupId>
            <artifactId>jna-platform</artifactId>
            <version>5.4.0</version>
        </dependency>