What is ai-instructions spring-boot-async.instructions.md?

A set of project rules for handling background work in Spring Boot with the @Async annotation. It covers enabling asynchronous execution, worker methods, and APIs that start or report jobs.

Use it when adding Spring Boot workers, asynchronous event listeners, or request-and-job APIs. It guides @EnableAsync, container-managed worker methods, and the boundary between request processing and background work.

It prevents background work from being wired incorrectly, such as expecting a method call within the same class to run in the background. It also keeps request handling, events, logging, and error responses under the rules that own them.

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Model	Per session	Once invoked
Fable 5.1	$0.00563	$0.00563
Opus 5.5	$0.00225	$0.00225
Sonnet 5.5	$0.00113	$0.00113
Haiku 4.5	$0.00056	$0.00056

Measured 1mo ago against content hash 41209041a557, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

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ai-instructions spring-boot-async.instructions.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

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.github/instructions/spring-boot-async.instructions.md · 58 lines

How it starts

The opening of the file, as written. The whole thing — 58 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Spring Boot Async Contract

Apply this contract when the application uses Spring @Async (background methods or async event listeners). Virtual-thread enablement stays in the virtual-threads contract. Application-event when to listen async stays in the events contract; this file owns @EnableAsync and how @Async methods behave.

Architecture owns feature packages and constructor injection. Controller owns REST boundaries. Logging and i18n own log keys. Exception handling owns API error mapping.

Enablement

Add @EnableAsync on the Spring Boot application class when any @Async method or async @EventListener exists.
Do not add a custom TaskExecutor bean unless the product needs a named executor beyond Boot's default (virtual-threads contract).

@Async methods

Put @Async on Spring-managed beans called through the container proxy (for example a dedicated worker bean). Self-invocation on the same class does not run asynchronously.
Prefer @Async for work that should leave the request thread (for example job processing or blocking/latency-sensitive listeners). Keep trivial in-memory reactions synchronous (events contract).
Return CompletableFuture (or another CompletionStage) when the caller must observe completion (for example a worker method completed via whenComplete in the service).
Do not put @Async on REST controller methods.

Request-scoped async jobs

When HTTP clients submit work that finishes later:

Accept the job in the service, start the @Async worker, and return quickly (for example 202 Accepted with a Location to a status resource).
Track lifecycle in a feature store (for example queued → running → succeeded/failed).
Surface executor rejection as a feature exception (for example TaskRejectedException mapped to a domain submission-rejected exception).
Record failures from the completion callback; do not leave jobs stuck in running forever after worker errors.

Forbidden

Read the full file on GitHub · 58 lines

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1mo ago Changed · -1 lines · -47 tokens per session 41209041a557
1mo ago First seen · 59 lines · 610 tokens per session scan A 4e9272aa7ab2

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ai-instructions spring-boot-async.instructions.md is an instructions file published in the GitHub repository lsampaioweb/ai-instructions (1 stars, last pushed 5d ago), licensed MIT. It adds 563 tokens to every session, about $0.0023 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-30.

Backend and APIs

ai-instructions spring-boot-async.instructions.md next to 6 instructions from other repositories
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