public boolean isRestartable() {
        boolean restartable;
        try {
            restartable = Class.forName(WRAPPER_CLASSNAME) != null;
        }
        catch (ClassNotFoundException e) {
            restartable = false;
        }
        return restartable;
    }
Stops the server only if running in standalone mode. Do nothing if the server is running
inside of another server.
xmppserver/src/main/java/org/jivesoftware/openfire/XMPPServer.java