com.sun.javafx com.sun.javafx.fxml不存在

使用idea基于maven在写JavaFX demo的时候，fxml路径正确，但是运行的时候一直报错fxml文件不存在，试了多种路径，仍然不行，后来发现在src的目录下的文件，除了.java的，都不会编译。

Exception in Application start method
 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 com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
     at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
     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$FXHelper.main(LauncherHelper.java:767)
 Caused by: java.lang.RuntimeException: Exception in Application start method
     at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
     at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
     at java.lang.Thread.run(Thread.java:748)
 Caused by: java.lang.NullPointerException: Location is required.
     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207)
     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
     at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
     at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
     at org.gmk.App.start(App.java:22)
     at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
     at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
     at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
     at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
     at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
     at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
     ... 1 more

 写的代码和文件目录如下所示：

public class App extends Application {
    public static void main( String[] args )
    {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setTitle("代码生成器");
        Parent root = FXMLLoader.load(getClass().getResource("main.fxml"));
        Scene scene=new Scene(root,818.4,399);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

 根据这种情况，需要在maven中进行配置，声明编译的时候需要编译的文件：

<build>
    <resources>
            <!--两个resource节点都加上吧，如果你两个目录下都有配置文件的话。只加一个resource节点，只会编译这个节点配置的目录下的xml,properties文件-->
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.fxml</include>
                    <include>**/*.properties</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.fxml</include>
                    <include>**/*.properties</include>
                </includes>
            </resource>
    </resources>
</build>

然后刷新maven，重新编译的时候，就会把fxml也进行编译。