我当前的项目是一个带有 RMI 的 JavaFX 应用程序。目前我有两节三课，我想减少到两节，但我不知道如何减少。
三个类: StartClient.java 横幅 Controller .java AEXBanner.java
代码和错误消息:
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:497) 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:497) at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767) Caused by: java.lang.IllegalStateException: Not on FX application thread; currentThread = main at com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:236) at com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:423) at javafx.stage.Stage.(Stage.java:241) at javafx.stage.Stage.(Stage.java:227) at client.BannerController.(BannerController.java:71) at client.BannerController.main(BannerController.java:174) ... 11 more Exception running application client.BannerController D:\Dropbox\HBO ICT\Leerjaar 2\GSO3\AEXBanner Week 1\nbproject\build-impl.xml:1051: The following error occurred while executing this line: D:\Dropbox\HBO ICT\Leerjaar 2\GSO3\AEXBanner Week 1\nbproject\build-impl.xml:805: Java returned: 1 BUILD FAILED (total time: 17 seconds)
使用 StartClient 启动程序后(当 RMI 服务器正在运行时)一切正常。但是当我直接使用 BannerController 类启动应用程序时，Netbeans 给出了上面发布的错误。
我 100% 确定 RMI 服务器工作正常，因此无需担心。
这三个类可以在下面找到:
启动客户端:
package client;
import javafx.application.Application;
import javafx.stage.Stage;
/**
*
* @author Max
*/
public class StartClient extends Application {
@Override
public void start(Stage primaryStage) {
BannerController.main(null);
}
public static void main(String[] args) {
launch(args);
}
}
横幅 Controller : 包客户端；
/**
*
* @author Max
*/
import shared.IEffectenBeurs;
import shared.IFonds;
import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.util.Scanner;
import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.stage.Stage;
public class BannerController extends Application {
private AEXBanner banner;
private IEffectenBeurs effectenbeurs;
private Timer pollingTimer;
private String bindingName = "Effectenbeurs";
private Registry registry = null;
private static boolean locateRegistry = true;
public BannerController(String ip, int port) {
banner = new AEXBanner();
pollingTimer = new Timer();
System.out.println("Client: IP Address: " + ip);
System.out.println("Client: Port number " + port);
if (locateRegistry) {
// Locate registry at IP address and port number
registry = locateRegistry(ip, port);
// Print result locating registry
if (registry != null) {
printContentsRegistry();
System.out.println("Client: Registry located");
} else {
System.out.println("Client: Cannot locate registry");
System.out.println("Client: Registry is null pointer");
}
if (registry != null) {
effectenbeurs = bindEffectenbeursUsingRegistry();
}
} else {
// Bind fonds using Naming
effectenbeurs = bindEffectenbeursUsingNaming(ip, port);
}
if (effectenbeurs != null) {
System.out.println("Client: Effectenbeurs bound");
} else {
System.out.println("Client: Effectenbeurs is null pointer");
}
banner.start(new Stage());
pollingTimer.schedule(new TimerTask() {
@Override
public void run() {
try {
StringBuilder sb = new StringBuilder();
for (IFonds f : effectenbeurs.getKoersen()) {
sb.append(f.toString() + " ");
}
System.out.println(sb.toString());
banner.setKoersen(sb.toString());
} catch (RemoteException ex) {
Logger.getLogger(BannerController.class.getName()).log(Level.SEVERE, null, ex);
}
}
}, 0, 2000);
}
// Print contents of registry
private void printContentsRegistry() {
try {
String[] listOfNames = registry.list();
System.out.println("Client: list of names bound in registry:");
if (listOfNames.length != 0) {
for (String s : registry.list()) {
System.out.println(s);
}
} else {
System.out.println("Client: list of names bound in registry is empty");
}
} catch (RemoteException ex) {
System.out.println("Client: Cannot show list of names bound in registry");
System.out.println("Client: RemoteException: " + ex.getMessage());
}
}
private IEffectenBeurs bindEffectenbeursUsingRegistry() {
IEffectenBeurs effectenbeurs1 = null;
try {
Object object = registry.lookup(bindingName);
effectenbeurs1 = (IEffectenBeurs) registry.lookup(bindingName);
} catch (RemoteException ex) {
System.out.println("Client: Cannot bind Effectenbeurs");
System.out.println("Client: RemoteException: " + ex.getMessage());
effectenbeurs1 = null;
} catch (NotBoundException ex) {
System.out.println("Client: Cannot bind Effectenbeurs");
System.out.println("Client: NotBoundException: " + ex.getMessage());
effectenbeurs1 = null;
}
return effectenbeurs1;
}
private Registry locateRegistry(String ipAddress, int portNumber) {
Registry registry = null;
try {
registry = LocateRegistry.getRegistry(ipAddress, portNumber);
} catch (RemoteException ex) {
System.out.println("Client: Cannot locate registry");
System.out.println("Client: RemoteException: " + ex.getMessage());
registry = null;
}
return registry;
}
private IEffectenBeurs bindEffectenbeursUsingNaming(String ipAddress, int portNumber) {
IEffectenBeurs Effectenbeurs = null;
try {
Effectenbeurs = (IEffectenBeurs) Naming.lookup("rmi://" + ipAddress + ":" + portNumber + "/" + bindingName);
} catch (MalformedURLException ex) {
System.out.println("Client: Cannot bind Effectenbeurs");
System.out.println("Client: MalformedURLException: " + ex.getMessage());
Effectenbeurs = null;
} catch (RemoteException ex) {
System.out.println("Client: Cannot bind Effectenbeurs");
System.out.println("Client: RemoteException: " + ex.getMessage());
Effectenbeurs = null;
} catch (NotBoundException ex) {
System.out.println("Client: Cannot bind Effectenbeurs");
System.out.println("Client: NotBoundException: " + ex.getMessage());
Effectenbeurs = null;
}
return Effectenbeurs;
}
public static void main(String[] args) {
if (locateRegistry) {
System.out.println("CLIENT USING LOCATE REGISTRY");
} else {
System.out.println("CLIENT USING NAMING");
}
// // Get ip address of server
Scanner input = new Scanner(System.in);
System.out.print("Client: Enter IP address of server: ");
String ipAddress = input.nextLine();
// Get port number
System.out.print("Client: Enter port number: ");
int portNumber = input.nextInt();
// Create client
BannerController client = new BannerController(ipAddress, portNumber);
}
@Override
public void start(Stage primaryStage) throws Exception {
}
}
我非常怀疑第三类与这个问题有什么关系，但以防万一:我把它包括在内。
AEX 横幅: 包客户端；
import java.rmi.RemoteException;
import javafx.animation.AnimationTimer;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.stage.Stage;
public class AEXBanner extends Application {
public static final int WIDTH = 1000;
public static final int HEIGHT = 100;
public static final int NANO_TICKS = 20000000;
// FRAME_RATE = 1000000000/NANO_TICKS = 50;
private Text text;
private double textLength;
private double textPosition;
private BannerController controller;
private AnimationTimer animationTimer;
private Timeline timeline;
private int TIMERTICK = 200;
private int frame = 0;
private String koersen;
public void setController(BannerController banner) {
//controller = banner(this);
}
@Override
public void start(Stage primaryStage) {
Font font = new Font("Arial", HEIGHT);
text = new Text();
//controller = new BannerController(this);
text.setFont(font);
text.setFill(Color.BLACK);
Pane root = new Pane();
root.getChildren().add(text);
Scene scene = new Scene(root, WIDTH, HEIGHT);
primaryStage.setTitle("AEX banner");
primaryStage.setScene(scene);
primaryStage.show();
primaryStage.toFront();
timeline = new Timeline();
timeline.setCycleCount(Timeline.INDEFINITE);
timeline.setAutoReverse(false);
// Start animation: text moves from right to left
animationTimer = new AnimationTimer() {
private long prevUpdate;
@Override
public void handle(long now) {
long lag = now - prevUpdate;
if (lag >= NANO_TICKS) {
// calculate new location of text
// TODO
if (textPosition < 0 - textLength) {
textPosition = WIDTH;
}
textPosition -= 5;
text.relocate(textPosition, 0);
prevUpdate = now;
}
}
@Override
public void start() {
prevUpdate = System.nanoTime();
textPosition = WIDTH;
text.relocate(textPosition, 0);
//setKoersen("Nothing to display");
super.start();
}
};
animationTimer.start();
}
public void setKoersen(String koersen) {
text.setText(koersen);
textLength = text.getLayoutBounds().getWidth();
}
}
结束我的问题(只是为了说清楚):当 RMI 服务器运行时，我需要使用 StartClient 启动这个项目。 StartClient 启动 BannerController。我希望能够直接使用 BannerController 类启动程序。
任何提示或可能的解决方案将不胜感激!
编辑: 在 Lasagna 建议的更改之后，当我启动 BannerController 时，直接出现此错误:
Exception in Application constructor
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:497)
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:497)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Unable to construct Application instance: class client.BannerController
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:907)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NoSuchMethodException: client.BannerController.<init>()
at java.lang.Class.getConstructor0(Class.java:3082)
at java.lang.Class.getConstructor(Class.java:1825)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:818)
at com.sun.javafx.application.PlatformImpl.lambda$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$148(WinApplication.java:191)
... 1 more
Exception running application client.BannerController
D:\Dropbox\HBO ICT\Leerjaar 2\GSO3\AEXBanner Week 1\nbproject\build-impl.xml:1051: The following error occurred while executing this line:
D:\Dropbox\HBO ICT\Leerjaar 2\GSO3\AEXBanner Week 1\nbproject\build-impl.xml:805: Java returned: 1
BUILD FAILED (total time: 0 seconds)
最佳答案
让我们看看您的错误。
sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767) Caused by: java.lang.IllegalStateException: Not on FX application thread; currentThread = main
这表示您没有“FX 应用程序线程”，并且您当前的线程是“主线程”。
这是因为您尝试使用 main 方法作为“主要方法”，但在 FX 中，它不会那样工作(时髦吧？:))。 main 只是启动 FX 应用程序本身的方法，这就是您收到此错误的原因。
<小时/>应用程序的启动方法是事情发生的地方。
在您的第一个类“StartClient”中，您使用“BannerController”的 main，然后在您的 main 中使用“launch(args)”，这就是您启动 FX 应用程序的方式。
在您的横幅应用程序中，您有一个包含一堆内容的主类，但没有 launch(args)
我也不确定为什么“start”会抛出一个内部没有代码的异常。
<小时/>所以你需要做的是
- 从除主类之外的所有类中删除应用程序。
- 确保主类的 main 方法中有
“launch(args)”。 - 确保主类重写“start”方法，并从那里“启动”代码。
因此请使用此代码
public static void main(String[] args) {
if (locateRegistry) {
System.out.println("CLIENT USING LOCATE REGISTRY");
} else {
System.out.println("CLIENT USING NAMING");
}
// // Get ip address of server
Scanner input = new Scanner(System.in);
System.out.print("Client: Enter IP address of server: ");
String ipAddress = input.nextLine();
// Get port number
System.out.print("Client: Enter port number: ");
int portNumber = input.nextInt();
// Create client
BannerController client = new BannerController(ipAddress, portNumber);
}
@Override
public void start(Stage primaryStage) throws Exception {
}
并将其更改为
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
if (locateRegistry) {
System.out.println("CLIENT USING LOCATE REGISTRY");
} else {
System.out.println("CLIENT USING NAMING");
}
// // Get ip address of server
Scanner input = new Scanner(System.in);
System.out.print("Client: Enter IP address of server: ");
String ipAddress = input.nextLine();
// Get port number
System.out.print("Client: Enter port number: ");
int portNumber = input.nextInt();
// Create client
BannerController client = new BannerController(ipAddress, portNumber);
}
关于java - 更改 JavaFX 应用程序启动表单，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36558420/