Firebase Cloud Messaging notification from Java instead of Firebase Console

Question

I am new to Firebase and I am running into errors such as mismatch sender id and Authentication Error with HTTP status 401 when my Java application tries to send a notificat

Answer 1

I needed to send FCM notification from my java EE application and I found this very helpful. Might save someone some time.

...The github repo is a library interface for Firebase Cloud Messaging (FCM) API (NB// I am not the author). So I followed instructions in the readme: added the jar file as a dependency to my project and could just invoke the library methods with respective parameters.

e.g. Pushraven.setKey(my_key); to set your server key and

Notification raven = new Notification();
raven.title("MyTitle")
     .text("Hello World!")
     .color("#ff0000")
     .to(client_key);

to build a notification. The instructions from the repo are pretty much clear and helpful.