Hacktoberfest 2026: the issues maintainers tagged for October, open and beginner-friendly. Browse Hacktoberfest issues

Firebase Messaging throws exception and doesn't get back until server restart

Open
#794 3 comments 0 reactions 0 assignees View on GitHub

Nobody has claimed this yet.

Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
java
Domain
api, authentication, backend

Research direction

Start with the pom.xml dependency on firebase-admin 9.1.1 and trace the FirebaseMessagingException path for service-account access-token failures. Gather logs around the intermittent failure and compare behavior before and after a WildFly restart; done means identifying a reproducible cause and documenting a reliable fix or confirming an SDK issue.

Written by the indexing model from the issue text.

Description

api: messaging needs-triage

I have a system built with spring boot, java 8 and hosted on google cloud using compute engine.
My server app is wildfly 21.0.1.Final.
I am using firebase messaging 9.1.1 to deliver notifications to the application users.
The service is working fine most of the time, however, I get this error from time to time.

com.google.firebase.messaging.FirebaseMessagingException: Failed to establish a connection: Error getting access token for service account: IP_OF_PROXY_HOST_GOES_HERE, iss: firebase-adminsdk-project@projectname.iam.gserviceaccount.com

As a workaround, I do a full server (wildfly) restart to get the service back.

In my pom file, I have:

com.google.firebase
firebase-admin
9.1.1

I have searched for similar issues and checked:
1- The system clock is synchronized
2- Firewall access to firebase
3- The service works well and the issue happens randomly from time to time.
4- I can not reproduce since I don't know the cause.

Note: I don't use any other firebase service in this product.

Does anyone know what is happening and how to overcome this issue?

Dominant language
Java
Stars
620
Forks
305
Avg merge
4d 9h
Merged PRs (30d)
4

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

More from firebase/firebase-admin-java

All issues in firebase/firebase-admin-java

Similar issues

More Java issues

Get new issues in your inbox

A short digest of beginner-friendly GitHub issues.