Refresh printers in Java while application is running

Question

As the title says, I would like to refresh the printers that are registered in the settings of the computer while my Java application is running. Normally, I can use P

Answer 1

There is no need to restart the application in order to refresh the list of print services.

Here I found the solution:

/**
 * Printer list does not necessarily refresh if you change the list of 
 * printers within the O/S; you can run this to refresh if necessary.
 */
public static void refreshSystemPrinterList() {
    Class[] classes = PrintServiceLookup.class.getDeclaredClasses();
    for (Class clazz : classes) {
        if ("javax.print.PrintServiceLookup$Services".equals(clazz.getName())) {
            // sun.awt.AppContext.getAppContext().remove(clazz);
            // Use reflection to avoid "Access restriction" error message
            try {
                Class acClass = Class.forName("sun.awt.AppContext");
                Object appContext = acClass.getMethod("getAppContext").invoke(null);
                acClass.getMethod("remove", Object.class).invoke(appContext, clazz);
            } catch (Exception e) {
            }
            break;
        }
    }
}

Basically, the static class PrintServiceLookup.Services maintains the list of print services. So, if you remove this class from the AppContext, you force PrintServiceLookup to create a new instance again. Thus, the list of print services gets refreshed.