Browser

A web browser control that allows loading a web page or a local HTML file, accessing DOM and executing JavaScript on the loaded web page, getting notifications about loading progress, dispatching keyboard and mouse events, etc.

The Browser instance itself is running in a separate native process that allocates memory and system resources that must be released. So, when a Browser instance is no longer needed, it must be closed through the close method to release all the allocated memory and system resources. For example:

Browser browser = engine.newBrowser();
...
browser.close();

Any attempt to use an already closed Browser instance will lead to the IllegalStateException.

The Browser instance is closed automatically when its Engine is closed or unexpectedly crashed. If the instance represents a popup window created by JavaScript via the window.open() function, then JavaScript can close the instance using the window.close() function.

To get notifications that the Browser instance has been closed please subscribe to the following event:

browser.on(BrowserClosed.class, event -> {
    // The Browser instance has been closed.
});