How to get the real exception in the exception handler

[david.cediel.ext (David Cediel)]

I’m implementing an exception handler using AbstractUiExceptionHandler, and I want to show the message of the exception, the problem with this is that the original exception is wrapped in vaadin exceptions. I attatch an example:

Default exception message:

New message using AbstractUiExceptionHandler:

This is my code:

@Override
    protected void doHandle(String className, String message, @Nullable Throwable throwable, UiContext context) {

        final User user = (User) currentAuthentication.getUser();

        boolean isAdminUser = user.getAuthorities().stream()
                .anyMatch(authority -> Objects.equals(authority.getAuthority(), FullAccessRole.CODE));

        ExceptionScreen exceptionScreen = context.getScreens()
                .create(ExceptionScreen.class, OpenMode.DIALOG);

        exceptionScreen.setExceptionCaptionMessage(messageBundle.getMessage("unexpectedError"));

        if (isAdminUser) {

            exceptionScreen.setExceptionDescriptionMessage(message);

            if (throwable != null) {
                StringWriter stringWriter = new StringWriter();
                PrintWriter printWriter = new PrintWriter(stringWriter);
                throwable.printStackTrace(printWriter);
                exceptionScreen.setStackTraceMessage(stringWriter.toString());
            }
        } else {
            exceptionScreen.setExceptionDescriptionMessage(messageBundle.getMessage("contactAdministrator"));
        }

        context.getScreens().show(exceptionScreen);

    }