CEF seems to lock up?

[jgcodes]

https://github.com/jgcodes2020/JChrome

When I run the program, JCEF loads the page I coded it to. However, the program seems to not respond to input. I can't interact with JCEF or the Swing controls. What causes this and how can I fix it?

[magreenblatt]

The linked repository is empty.

[jgcodes]

The repo is set up now.

[magreenblatt]

Does the problem reproduce with the JCEF sample apps? If not, how does your app differ from the sample apps?

[jgcodes]

It doesn't reproduce with the detailed sample.

In my app:
If I remove the Swing UI, it's fine. It locks up if I use Swing Components. I can't drag the window, click the buttons, or use the browser.

[magreenblatt]

The sample apps also use Swing. I suggest that you start with a sample app and try adding the functionality that you need, noting at what point you start having problems.

[jgcodes]

Apparently, this seems to lock up as well. There are no calls to the look and feel library or anything outside JCEF.

Code: Select all

public class JCLauncher {
  public static void main(String[] args) {
    SwingUtilities.invokeLater(() -> {
      JCFrame jcFrame = new JCFrame("www.google.ca");
    });
  }
}


Code: Select all

public class JCFrame extends JFrame {
  CefClient client; CefBrowser browser;
  public JCFrame(String url) {
    CefApp cef = CefApp.getInstance();
    client = cef.createClient();
    browser = client.createBrowser(url, false, false);

    this.add(browser.getUIComponent(), BorderLayout.CENTER);

    this.setSize(800, 600);
    this.setVisible(true);

    this.addWindowListener(new WindowAdapter() {
      @Override
      public void windowClosing(WindowEvent e) {
        JCFrame.this.dispose();
        CefApp.getInstance().dispose();
      }
    });
  }
}


[magreenblatt]

What OS, CEF and JVM version? Are the browser web contents loading and displaying? Did you create the required directory structure? Are there any console messages?

You’re not calling CefApp.startup. See the minimal sample app for reference: https://bitbucket.org/chromiumembedded/ ... Frame.java

[jgcodes]

The browser loads and displays the webpage, however I cannot use input. I made a call to CefApp.startup() and that doesn't seem to solve the problem. I am running Windows 10 update 2004, using JCEF 81.2.24.251, with OpenJDK 14.0.1.

[jgcodes]

I tested a reduced version of the simple sample app and it works. I think it has to do with the introduction of an AppHandler.
Here's the new JCFrame class for reference:

Code: Select all

public class JCFrame extends JFrame {
  private final CefApp cefInstance;
  CefClient client; CefBrowser browser;
  public JCFrame(String... cefArgs) {
    CefApp.addAppHandler(new CefAppHandlerAdapter(null) {
      @Override
      public void stateHasChanged(CefApp.CefAppState state) {
        if (state == CefApp.CefAppState.TERMINATED) System.exit(0);
      }
    });

    CefSettings settings = new CefSettings();
    boolean useOSR = (Arrays.binarySearch(cefArgs, "-osr") >= 0);
    settings.windowless_rendering_enabled = useOSR;

    cefInstance = CefApp.getInstance(settings);
    client = cefInstance.createClient();

    browser = client.createBrowser("www.google.ca", useOSR, false);

    this.add(browser.getUIComponent());
    this.setVisible(true);
    this.setExtendedState(JFrame.MAXIMIZED_BOTH);

    this.addWindowListener(new WindowAdapter() {
      @Override
      public void windowClosing(WindowEvent e) {
        cefInstance.dispose();
        dispose();
      }
    });
  }
}