我正在为idea构建一个插件。一般来说，我的插件包含一个工具窗口。toolwindow包含jfxpanel，其中包含从url加载其内容的javafx.scene.web.webview。
我面临的问题是，当我第一次调试并选择webview toolwindow标记时，javafx webview可以正常显示，但当我切换到其他标记，如“termainal”，然后切换回webview时，javafx webview无法正常显示，出现如下异常：

2021-06-09 13:00:41,176 [  31967]  ERROR - ellij.util.text.DateFormatUtil - IntelliJ IDEA 2019.3  Build #IC-193.5233.102 
2021-06-09 13:00:41,176 [  31967]  ERROR - ellij.util.text.DateFormatUtil - JDK: 11.0.4; VM: OpenJDK 64-Bit Server VM; Vendor: JetBrains s.r.o 
2021-06-09 13:00:41,176 [  31967]  ERROR - ellij.util.text.DateFormatUtil - OS: Mac OS X 
2021-06-09 13:00:41,180 [  31971]  ERROR - ellij.util.text.DateFormatUtil - Last Action:  
2021-06-09 13:00:49,549 [  40340]  ERROR - terminal.emulator.JediEmulator - Error processing OSC 1;..ts/PluginOpen 
2021-06-09 13:00:49,563 [  40354]  ERROR - terminal.emulator.JediEmulator - Unhandled Control sequence
parsed                        :ESC[?2004h
bytes read                    :ESC[ 
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
    at javafx.graphics/com.sun.glass.ui.Screen.initScreens(Screen.java:412)
    at javafx.graphics/com.sun.glass.ui.Screen.notifySettingsChanged(Screen.java:381)

public class CJDesignerToolWindow implements ToolWindowFactory  {
    private final MyBrowser myBrowser = new MyBrowser();
    @Override
    public void createToolWindowContent(@NotNull Project project, @NotNull ToolWindow toolWindow) {

        JComponent component = toolWindow.getComponent();
        component.getParent().add(myBrowser);
        load();
    }
    public void load() {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                myBrowser.setVisible(true);
                myBrowser.loadURL("www.baidu.com");
            }
        });
    }
}

这是webview定义

package com.fss.webview;

import javax.swing.*;

import com.fss.biz.handler.JavaClassInfoParseHandler;
import javafx.application.Platform;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.concurrent.Worker;
import javafx.embed.swing.JFXPanel;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebEvent;
import javafx.scene.web.WebView;
import netscape.javascript.JSObject;

import java.awt.*;
import java.awt.event.*;
import java.net.MalformedURLException;
import java.net.URL;

import static javafx.concurrent.Worker.State.FAILED;

/**
 * @author fangshusen
 */
public class MyBrowser extends JPanel {
    private final JFXPanel webView = new JFXPanel();
    private WebEngine engine;
    private final JPanel nestedBrowser = new JPanel(new BorderLayout());
    private final JLabel lblStatus = new JLabel();
    private final JButton btnGo = new JButton("Go");
    private final JTextField txtURL = new JTextField();
    private final JProgressBar progressBar = new JProgressBar();

    JavaClassInfoParseHandler javaSourceHandler = new JavaClassInfoParseHandler();

    public MyBrowser() {
        super();
        initComponents();
    }

    private void initComponents() {
        createScene();

        ActionListener al = new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                loadURL(txtURL.getText());
            }
        };

        btnGo.addActionListener(al);
        txtURL.addActionListener(al);

        progressBar.setPreferredSize(new Dimension(150, 18));
        progressBar.setStringPainted(true);

        JPanel topBar = new JPanel(new BorderLayout(5, 0));
        topBar.setBorder(BorderFactory.createEmptyBorder(3, 5, 3, 5));
        topBar.add(txtURL, BorderLayout.CENTER);
        topBar.add(btnGo, BorderLayout.EAST);

        JPanel statusBar = new JPanel(new BorderLayout(5, 0));
        statusBar.setBorder(BorderFactory.createEmptyBorder(3, 5, 3, 5));
        statusBar.add(lblStatus, BorderLayout.CENTER);
        statusBar.add(progressBar, BorderLayout.EAST);

        nestedBrowser.add(topBar, BorderLayout.NORTH);
        nestedBrowser.add(webView, BorderLayout.CENTER);
        nestedBrowser.add(statusBar, BorderLayout.SOUTH);

        //getContentPane().add(panel);
        this.add(nestedBrowser);

        setPreferredSize(new Dimension(1024, 1024));

        //setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //pack();

    }

    private void createScene() {

        Platform.runLater(new Runnable() {
            @Override
            public void run() {

                WebView view = new WebView();
                engine = view.getEngine();

                engine.titleProperty().addListener(new ChangeListener<String>() {
                    @Override
                    public void changed(ObservableValue<? extends String> observable, String oldValue, final String newValue) {
                        SwingUtilities.invokeLater(new Runnable() {
                            @Override
                            public void run() {
                                //MyBrowser.this.setTitle(newValue);
                            }
                        });
                    }
                });

                engine.setOnStatusChanged(new EventHandler<WebEvent<String>>() {
                    @Override
                    public void handle(final WebEvent<String> event) {
                        SwingUtilities.invokeLater(new Runnable() {
                            @Override
                            public void run() {
                                lblStatus.setText(event.getData());
                            }
                        });
                    }

                });

                //注册Java方法处理器
                engine.getLoadWorker().stateProperty().addListener(new ChangeListener<Worker.State>() {
                    @Override
                    public void changed(ObservableValue<? extends Worker.State> observable, Worker.State oldValue, Worker.State newValue) {
                        if (newValue == Worker.State.SUCCEEDED) {
                            JSObject win = (JSObject) engine.executeScript("window");
                            win.setMember("apps", javaSourceHandler);//设置变量
                        }
                    }
                });

                engine.locationProperty().addListener(new ChangeListener<String>() {
                    @Override
                    public void changed(ObservableValue<? extends String> ov, String oldValue, final String newValue) {
                        SwingUtilities.invokeLater(new Runnable() {
                            @Override
                            public void run() {
                                txtURL.setText(newValue);
                            }
                        });
                    }
                });

                engine.getLoadWorker().workDoneProperty().addListener(new ChangeListener<Number>() {
                    @Override
                    public void changed(ObservableValue<? extends Number> observableValue, Number oldValue, final Number newValue) {
                        SwingUtilities.invokeLater(new Runnable() {
                            @Override
                            public void run() {
                                progressBar.setValue(newValue.intValue());

                            }
                        });
                    }
                });

                engine.getLoadWorker().exceptionProperty().addListener(new ChangeListener<Throwable>() {

                    public void changed(ObservableValue<? extends Throwable> o, Throwable old, final Throwable value) {
                        if (engine.getLoadWorker().getState() == FAILED) {
                            SwingUtilities.invokeLater(new Runnable() {
                                @Override
                                public void run() {
                                    JOptionPane.showMessageDialog(
                                            nestedBrowser,
                                            (value != null) ?
                                                    engine.getLocation() + "\n" + value.getMessage() :
                                                    engine.getLocation() + "\nUnexpected error.",
                                            "Loading error...",
                                            JOptionPane.ERROR_MESSAGE);
                                }
                            });
                        }
                    }
                });

                webView.setScene(new Scene(view));
                webView.setPreferredSize(new Dimension(1024, 1024));
            }
        });
    }

    public void loadURL(final String url) {
        Platform.runLater(new Runnable() {
            @Override
            public void run() {
                String tmp = toURL(url);

                if (tmp == null) {
                    tmp = toURL("http://" + url);
                }

                engine.load(tmp);
            }
        });
    }

    private static String toURL(String str) {
        try {
            return new URL(str).toExternalForm();
        } catch (MalformedURLException exception) {
            return null;
        }
    }

    public static void run() {
        SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                MyBrowser browser = new MyBrowser();
                browser.setVisible(true);
                browser.loadURL("http://google.com");
            }
        });
    }
}

由于不允许设置断点，因此无法通过设置断点获得更多信息，我想知道是什么原因导致此问题，以及如何修复它？
先谢谢你，方树森