ReadMeFeed / Community knowledge
Real questions. Useful conversations. Find the people who know your stack.
Frameworks & web · #vertx
The goal is to decide whether the Vert.x SQL client connection pool should proactively evict idle connections after a period of inactivity or rely solely on PostgreSQL's idle-in-transaction session timeout to avoid intermittent pool exhaustion during burst traffic. Constraints include using Vert.x 4 with its HikariCP‑backed pool (configurable maxSize, idleTi
Vert.x Web’s DateHeaderHandler parses the HTTP Date header only when the value matches the RFC1123 format in GMT (e.g., Tue, 15 Nov 1994 08:12:31 GMT ). A header with a non‑GMT offset, such as Tue, 15 Nov 1994 08:12:31 +0200 , results in a parsing exception. Developers must drop the header or implement a custom handler using java.time.DateTimeFormatter to ap
Vert.x 4 has shifted toward a more modular approach for selecting the underlying discovery mechanism within the Cluster Manager, moving away from the tightly coupled defaults of previous versions. When scaling the Event Bus across multiple JVMs, the choice of cluster manager directly impacts how nodes discover each other and maintain shared state. There is u
Authentication goal and constraint Enforce least-privilege access in a Vert.x application while ensuring expired credentials produce explicit HTTP 401 responses instead of silent failures. The Vert.x AuthProvider interface permits timestamp validation inside authenticate, but the framework does not enforce a default token lifetime. Native JWT expiry keeps va
A Vert.x application using the event bus operates in a single-node local setup without explicit clustering configuration. The same application is intended to run as a multi-node deployment where the event bus should be clustered via Hazelcast. Vert.x delegates cluster formation to Hazelcast and leaves the choice of discovery mechanism to the operator. In env
When building a Vert.x HTTP application, developers must supply the Date header as an RFC‑1123 formatted string. Vert.x validates this value in HttpServerResponseImpl.putDateHeader and throws java.lang.IllegalArgumentException with the message "Invalid date format" if the string does not match the expected pattern. Because Vert.x does not provide a built‑in
A design is needed to fail service calls that exceed an SLA without leaving work running on the event loop or worker threads. Vert.x Promise API supports promise.setTimeout(long, TimeUnit) which fails the Future with a TimeoutException when the duration elapses. The underlying async task is not cancelled by the timeout. The EventBus request/response pattern
Goal Define an alerting strategy for Vert.x 4.x that captures genuine lifecycle failures — such as the IllegalStateException: Vert.x instance is closed thrown when any Vertx API is invoked after vertx.close() — while avoiding notification storms caused by repeated misuse of a closed instance. Constraints and uncertainty The exception is a clear signal of pro
When measuring the Vert.x EventBus vertx.eventbus.send.timer metric while increasing the number of concurrent sender verticles, the observed latency shows a noticeable increase. The goal is to determine whether this rise stems from contention on the shared EventBus event‑loop thread, from the overhead of the metrics instrumentation, or from a combination of