小编And*_*rdi的帖子

我真的很绝望。\n我不\xe2\x80\x99不知道为什么，但每次我尝试运行我的程序时都会出现此错误。\n我正在使用 Netbeans 和 Java 10.0.2，以便已经安装了 JavaFX。\ n我认为\xe2\x80\x99s是由于FXML文件的一些问题造成的。\n你能帮助我吗？

java.lang.reflect.InvocationTargetException\n    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)\n    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n    at java.base/java.lang.reflect.Method.invoke(Method.java:564)\n    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:473)\n    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:372)\n    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)\n    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)\n    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)\n    at java.base/java.lang.reflect.Method.invoke(Method.java:564)\n    at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:941)\nCaused by: java.lang.RuntimeException: Exception in Application start method\n    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:973)\n    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:198)\n    at java.base/java.lang.Thread.run(Thread.java:844)\nCaused by: javafx.fxml.LoadException: Root hasn't been set. Use method setRoot() before load.\nfile:/C:/Users/User/Documents/NetBeansProjects/gruppo71/dist/run2124011701/gruppo71.jar!/gruppo71/FXMLDocument.fxml:13\n\n    at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2621)\n    at javafx.fxml/javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:105)\n    at javafx.fxml/javafx.fxml.FXMLLoader$RootElement.constructValue(FXMLLoader.java:1338)\n    at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:754)\n    at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)\n    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)\n    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)\n    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3253)\n    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3210)\n    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3179)\n    at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3152)\n    at …