从不扩展Application的类的Main方法启动JavaFX [英] Starting JavaFX from Main method of class which doesn't extend Application
问题描述
我遇到了从类的Main方法启动JavaFX应用程序的问题，该方法没有扩展 javafx.application.Application
在我的应用程序中有 MainApp.java ，它应该启动覆盖方法 start（）在 MainUIController.java 中，扩展 Applciation
<当我从
MainUIController.java 启动Main方法时，一切正常。 MainApp。 java
public class MainApp {
public static void main（String [] args ）{
PersonJDBCTemplate jdbc = connect（）;
MainUIController mUIc = new MainUIController（jdbc）;
mUIc.start（new Stage（））;
}
public static PersonJDBCTemplate connect（）{
ApplicationContext context = new ClassPathXmlApplicationContext（
Beans.xml）;
PersonJDBCTemplate personJDBCTemplate =（PersonJDBCTemplate）context
.getBean（personJDBCTemplate）;
return personJDBCTemplate;
}
}
MainUIController.java
公共类MainUIController扩展Application {
private Stage stage;
//私人用户登录用户;
私人最终双倍MINIMUM_WINDOW_WIDTH = 800.0;
私人最终双倍MINIMUM_WINDOW_HEIGHT = 570.0;
private String version =0.6;
private PersonJDBCTemplate jdbc;
public MainUIController（PersonJDBCTemplate jdbc）{
this.jdbc = jdbc;
}
@Override
public void start（Stage primaryStage）{
try {
stage = primaryStage;
stage.setTitle（夏普）;
stage.setMinWidth（MINIMUM_WINDOW_WIDTH）;
stage.setMinHeight（MINIMUM_WINDOW_HEIGHT）;
stage.setResizable（false）;
gotoLogin（）;
primaryStage.show（）;
} catch（Exception ex）{
Logger.getLogger（MainUIController.class.getName（））。log（
Level.SEVERE，null，ex）;
}
}
public void gotoLogin（）{
try {
LoginController login =（LoginController）replaceSceneContent（/ fxml / Login.fxml ）;
login.setApp（this）;
} catch（Exception ex）{
Logger.getLogger（MainUIController.class.getName（））。log（
Level.SEVERE，null，ex）;
}
}
}
运行后 MainApp ，我收到以下错误：
线程mainjava中的异常.lang.ExceptionInInitializerError
at javafx.stage.Window。< init>（Window.java:1110）
at javafx.stage.Stage。< init>（Stage.java:236)
at javafx.stage.Stage。< init>（Stage.java:224）
at ch.kit.sharp.main.MainApp.main（MainApp.java:15）
引起： java.lang.IllegalStateException：仅在事件线程上允许此操作; currentThread = main
at com.sun.glass.ui.Application.checkEventThread（Application.java:445）
at com.sun.glass.ui.Screen.setEventHandler（Screen.java:245）
at com.sun.javafx.tk.quantum.QuantumToolkit.setScreenConfigurationListener（QuantumToolkit.java:600）
at javafx.stage.Screen。< clinit>（Screen.java:80）
... 4更多
除了Nejinx所说的，你不能直接调用你的 start（），总是调用 launch（） ，因为它设置了 JavaFX环境，包括创建阶段和调用start（）传递阶段作为它的参数。
文档有一个特别注释at this this
注意：此方法在JavaFX应用程序线程上调用
launch（） 可以从任何类调用，考虑到类是否是直接不扩展 javafx.application.Application ，那么你必须将类扩展为启动方法的参数。
例如，考虑你有类 JavaFXMain 扩展应用程序
class JavaFXMain扩展Application {...}
你可以使用任何其他类，启动JavaFX应用程序。
class Main {
...
public void s omeMethod（）{
...
JavaFXMain.launch（JavaFXMain.class）; //启动JavaFX应用程序
...
}
}
在你的情况下，你可以在 MainApp 的主要方法中尝试这样的事情：
//如果你不打算传递任何参数，你可以删除args
MainUIController.launch（MainUIController.class，args）
I'm having problem to start a JavaFX Application from a Main method of a class which doesn't extend javafx.application.Application
In my application there is the MainApp.java which should start the overriden method start() in the MainUIController.java, which extends Applciation
When I start the Main method from the MainUIController.java everything works fine.
MainApp.java
public class MainApp {
public static void main(String[] args) {
PersonJDBCTemplate jdbc = connect();
MainUIController mUIc = new MainUIController(jdbc);
mUIc.start(new Stage());
}
public static PersonJDBCTemplate connect() {
ApplicationContext context = new ClassPathXmlApplicationContext(
"Beans.xml");
PersonJDBCTemplate personJDBCTemplate = (PersonJDBCTemplate) context
.getBean("personJDBCTemplate");
return personJDBCTemplate;
}
}
MainUIController.java
public class MainUIController extends Application {
private Stage stage;
// private User loggedUser;
private final double MINIMUM_WINDOW_WIDTH = 800.0;
private final double MINIMUM_WINDOW_HEIGHT = 570.0;
private String version = "0.6";
private PersonJDBCTemplate jdbc;
public MainUIController(PersonJDBCTemplate jdbc) {
this.jdbc = jdbc;
}
@Override
public void start(Stage primaryStage) {
try {
stage = primaryStage;
stage.setTitle("Sharp");
stage.setMinWidth(MINIMUM_WINDOW_WIDTH);
stage.setMinHeight(MINIMUM_WINDOW_HEIGHT);
stage.setResizable(false);
gotoLogin();
primaryStage.show();
} catch (Exception ex) {
Logger.getLogger(MainUIController.class.getName()).log(
Level.SEVERE, null, ex);
}
}
public void gotoLogin() {
try {
LoginController login = (LoginController) replaceSceneContent("/fxml/Login.fxml");
login.setApp(this);
} catch (Exception ex) {
Logger.getLogger(MainUIController.class.getName()).log(
Level.SEVERE, null, ex);
}
}
}
After running the MainApp, I get the following Error :
Exception in thread "main" java.lang.ExceptionInInitializerError
at javafx.stage.Window.<init>(Window.java:1110)
at javafx.stage.Stage.<init>(Stage.java:236)
at javafx.stage.Stage.<init>(Stage.java:224)
at ch.kit.sharp.main.MainApp.main(MainApp.java:15)
Caused by: java.lang.IllegalStateException: This operation is permitted on the event thread only; currentThread = main
at com.sun.glass.ui.Application.checkEventThread(Application.java:445)
at com.sun.glass.ui.Screen.setEventHandler(Screen.java:245)
at com.sun.javafx.tk.quantum.QuantumToolkit.setScreenConfigurationListener(QuantumToolkit.java:600)
at javafx.stage.Screen.<clinit>(Screen.java:80)
... 4 more
In addition to what Nejinx said, you must not directly call your start(), always call launch(), because it sets up the JavaFX environment, including creation of stage and calls start() passing the stage as an parameter to it.
The docs has a note specially stating this
NOTE: This method is called on the JavaFX Application Thread
The launch() can be called from any class, taking into consideration if the class is directly not extending javafx.application.Application, then you must pass the class extending it as an argument to the launch method.
For example, consider you have a class JavaFXMain which extends Application
class JavaFXMain extends Application {...}
You can use any other class, to start the JavaFX Application.
class Main {
...
public void someMethod() {
...
JavaFXMain.launch(JavaFXMain.class); // Launch the JavaFX application
...
}
}
In your case, you can try something like this inside the main method of MainApp:
// You may remove args if you don't intend to pass any arguments
MainUIController.launch(MainUIController.class, args)
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