# Connect Postgres for Quarkus

## Summary

Database connection for a Quarkus app on Ample. Verified on Quarkus: a managed PostgreSQL database auto-provisioned and injected as DATABASE_URL, with real queries succeeding at request time (records=ok). Build and start: `./mvnw -q -DskipTests package` producing one uber-jar (quarkus.package.jar.type=uber-jar), then `java -jar` on the jvm-21 template (Temurin JDK 21) with `quarkus.http.port` read from PORT.

## Infrastructure requirements

- [Compute](#): verified (Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.)
- [Postgres](#): verified (Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.)

## Prerequisites

- A Quarkus project (`./mvnw -q -DskipTests package` producing one uber-jar (quarkus.package.jar.type=uber-jar), then `java -jar` on the jvm-21 template (Temurin JDK 21) with `quarkus.http.port` read from PORT)
- A PostgreSQL driver reading DATABASE_URL at runtime
- An Ample account token with servers:write, databases:read

## Exact tested configuration

- template: `jvm-21`
- runtime: `java`
- size: `s-1vcpu-2gb`
- build: `./mvnw -q -DskipTests package`
- start: `java -jar $(ls target/*.jar | grep -v -- '-plain' | head -n 1)`

## Steps

1. **Build and start.** `./mvnw -q -DskipTests package` producing one uber-jar (quarkus.package.jar.type=uber-jar), then `java -jar` on the jvm-21 template (Temurin JDK 21) with `quarkus.http.port` read from PORT; the server must bind 0.0.0.0 on PORT.
2. **Read DATABASE_URL at runtime.** Open connections from the environment inside handlers or a pool; omit DATABASE_URL to auto-provision a managed database or pass `--env DATABASE_URL=...` for an existing one.
3. **Verify.** Fetch the live URL and `/p/relational-records` on the example; on failure read the build and runtime logs.

```
   ample logs <deployment_id> --kind build
   ```

## Tested examples

- **Quarkus pattern fixture** (tests/deploy-canaries/quarkus-patterns): Verified database connection on Quarkus.

## Success checks

- app responds on its public URL (`/` on the live URL, expect ample canary quarkus patterns)
- relational-records check from the example (`/p/relational-records` on the live URL, expect see the pattern fixture checks)

## Limitations

- Verified on the jvm-21 template at s-1vcpu-2gb; other sizes and Quarkus major versions are not verified.
- Region, compliance attestations and request-duration limits are unknown and not claimed.
- Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures are not verified.

## Cost estimate

Estimated 10.00 USD per month (size prices from pricing.toml at build revision a1b8c38919e59cd035ebabaced73cf84ece24371).
- app server x1 `s-1vcpu-1gb`: 5.00 USD
- managed PostgreSQL database x1 `s-1vcpu-1gb`: 5.00 USD

Always-on monthly price of the tested sizes; apps auto-pause when idle. Buckets are allocation-priced per quota and not included.

## Verification evidence

- canary_run on 2026-09-21T00:35:31Z at revision `c6c81daa9272c95c5ce381005ba7347a341e578f-dirty (CLI 0.1.21)`: Quarkus pattern fixture deployed on Ample (`./mvnw -q -DskipTests package` producing one uber-jar (quarkus.package.jar.type=uber-jar), then `java -jar` on the jvm-21 template (Temurin JDK 21) with `quarkus.http.port` read from PORT); for this guide: a managed PostgreSQL database auto-provisioned and injected as DATABASE_URL, with real queries succeeding at request time (records=ok). (expires 2027-03-20T00:35:31Z)

Last verified: 2026-09-21T00:35:31Z

## Execution binding

MCP tool `ample_deploy` (registry `mcp:ample_deploy`), schema hash `876465fce906da0c` observed 2026-09-21T03:19:59.461917+00:00 at revision `49962bcade4f`, binding state `current`, required scopes: servers:write, databases:read.