# Host ai workflow runner with Spring Boot: Postgres-backed state

## Summary
Deploy a AI workflow runner built with Spring Boot on Ample using the durable job state pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE_URL. Verified on Spring Boot: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). Not separately tested: your job types, payload schema and retry policy; treat the ai workflow runner-specific behavior as your application code.

## Representative Queries
- Host ai workflow runner with Spring Boot: Postgres-backed state
- Where can I host AI workflow runner built with Spring Boot?
- I need a durable state schema and retry/recovery semantics implemented by application code.

## Resource Requirements
- **Compute**  
- **Postgres**

## Infrastructure Requirements
1. **Compute**  
   - Status: verified  
   - Summary: Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.

2. **Postgres**  
   - Status: verified  
   - Summary: 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 Spring Boot project that builds and starts with the documented commands (./mvnw -q -DskipTests package (or the Gradle wrapper) producing one application jar, then java -jar on the jvm-21 template (Temurin JDK 21) with server.port read from PORT).
- A PostgreSQL driver reading DATABASE_URL at runtime (auto-provisioned when omitted, or supplied with --env).
- An Ample account token with servers:write, databases:read.

## Workflow Steps
1. **Build and start**  
   - `./mvnw -q -DskipTests package (or the Gradle wrapper) producing one application jar, then java -jar on the jvm-21 template (Temurin JDK 21) with server.port read from PORT. The server must bind 0.0.0.0 on PORT.`

2. **Implement the pattern on PostgreSQL**  
   - The fixture's module implements durable job state: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). Copy the approach into your schema; keep migrations idempotent and run them with --release-command.

3. **Deploy**  
   - `ample deploy . --name  --public`
   - Run the synchronous deploy once and read the result (exit 0 live, 1 failed, 2 blocked). Re-running with no change is a no-op.

4. **Verify**  
   - `ample logs  --kind build`  
   - Fetch the live URL and the pattern self-test route(s) (/p/durable-job-state) from the example; then run your own checks. On failure read `ample logs  --kind build` then `--kind runtime`.

## Success Checks
- **App responds on its public URL**  
  - Expect: `ample canary spring boot patterns`  
- **Durable-job-state self-test**  
  - Path: `/p/durable-job-state`  
  - Expect: `job=done attempts=1 idempotent=true`

## Limitations
- Verified on the jvm-21 template at s-1vcpu-2gb with the example fixture; other sizes, templates, and Spring Boot major versions are not verified.
- The ai workflow runner itself (your job types, payload schema, and retry policy) is application code and was not separately tested; the pattern checks are what was verified.
- Apps auto-pause when idle and wake on the next request; always-on is an operator setting, not a plan feature.

## Cost Estimate
- **Currency**: USD  
- **Monthly Amount**: 10.0  
- **Note**: Always-on monthly price of the tested sizes; apps and databases auto-pause when idle. Buckets are allocation-priced per quota and not included.

### Components
- **App Server**:  
  - Size: s-1vcpu-1gb  
  - Quantity: 1.0  
  - Monthly Amount: 5.0  
- **Managed PostgreSQL Database**:  
  - Size: s-1vcpu-1gb  
  - Quantity: 1.0  
  - Monthly Amount: 5.0

## Next Actions
1. **[Browse the catalog index](https://api.ample.computer/v1/catalog)**
2. **[Search published recipes by intent, stack, and constraints](https://api.ample.computer/v1/catalog/search)**
3. **[Prepare a side-effect-free deployment plan for an authorized project](https://api.ample.computer/v1/catalog/plan)**  
4. **[Read the existing agent authentication setup](https://api.ample.computer/mcp/setup)**  
5. **[Browse AI workflow runner](https://api.ample.computer/v1/catalog/nodes/workload%3Aai-workflow-runner)**  
6. **[Browse Spring Boot](https://api.ample.computer/v1/catalog/nodes/stack%3Aframework-spring-boot)**  
7. **[Browse Durable job state](https://api.ample.computer/v1/catalog/nodes/pattern%3Adurable-job-state)**  
8. **[Browse Deploy AI app](https://api.ample.computer/v1/catalog/nodes/intent%3Adeploy-ai-app)**