eclipse-vertx/vert.x

NoStackTraceTimeoutException during connection to Kubernetes API server after upgrade to Spring Boot 4.0.3

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#6,252 opened on Jul 21, 2026

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Description

Version

vertx: 4.5.14

Context

Hello Vertx team,

We have met a strange issue since upgrade the Spring Boot to 4.0.3 that calling fabric8 kubernetes client serverSideApply() method failed with a request timeout during connection to the cluster API service.

Caused by: io.vertx.core.impl.NoStackTraceTimeoutException: The timeout period of 10000ms has been exceeded while executing GET /apis/cluster.x-k8s.io/v1beta1 for server E6F777209F3DCDD41D556D462490F7D4.gr7.us-east-1.eks.amazonaws.com:443

Which is similar with an issue reported before.

And even the workaround mentioned there to use a okhttp client instead of vert.x works for us...

However, the difference is we don't have such issue with kubernetes 7.X until upgrade the Spring Boot version to 4.0.3 ( or the latest available version 4.1.0 ).

We have raised an issue for Spring Boot team, but they preferred the issue from vertx...

Thanks!

Steps to reproduce

No response

Do you have a reproducer?

No response

Contributor guide

Research direction
Investigate the root cause of the NoStackTraceTimeoutException in Vert.x HTTP client when connecting to Kubernetes API server after Spring Boot upgrade. Compare with issue #5484 and check for changes in Vert.x HTTP client configuration or Spring Boot's auto configuration that may affect connection timeouts or TLS handling.
Tech stack
java
Domain
backendapicloud
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaVert.xSpring Boot
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50