当我尝试做 java -jar app.jar 我得到这个：
Exception in thread "JavaFX Application Thread" Exception in thread "main"
java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
at tao.qaflash.GUI.<clinit>(GUI.java:14)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplicationWithArgs$156(LauncherImpl.java:352)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 12 more
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.NullPointerException
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:383)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
... 5 more
我的环境是：Java 1.8.0_92、Gradle 2.16、Eclipse Mars 4.5.0、Java FX。我也用谷歌搜索了这个错误，我从那里尝试了一切，但没有成功。我尝试将 build.gradle 添加为依赖项 slfj-simple、log4j、logback-classic、slf4j-jdk14、junit、vaadin-slf4j-jdk14，但错误一直出现。
当我从 Eclipse 运行应用程序时，一切正常，日志被写入，只有当我尝试从命令行运行 jar 时，我才得到这个 ClassNotFoundException。
build.gradle 看起来像：
dependencies {
compile 'net.sf.staf:jstaf:3.4.4'
// SLF4J API module which will be used for logging
compile 'org.slf4j:slf4j-api:1.7.21'
// Log4J2 logging framework including the binding module to slf4j
compile 'org.apache.logging.log4j:log4j-slf4j-impl:2.5'
compile 'org.apache.logging.log4j:log4j-api:2.5'
compile 'org.apache.logging.log4j:log4j-core:2.5'
testCompile 'junit:junit:4.12'
testCompile "org.testfx:testfx-core:4.0.+"
testCompile "org.testfx:testfx-junit:4.0.+"
}
非常感谢任何帮助。