JDA how to send a message after enabling bot?

Question

Java

I use Java for the bot and accordingly jda, and I want that when the bot is turned on, it sends a message to a specific channel on a specific server, I'm trying to use

jda.awaitready().getGuildsById("id").getChanellsById("id").sendmessage("message").submit();

as a result, the message was not sent.