# Host AI Chat Application with Spring Boot: Postgres-backed State

## Summary
Deploy an AI chat application 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 chat application-specific behavior as your application code.

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

## Resource Requirements
- **Compute**: primitive:compute
- **Postgres**: primitive:postgres

## Infrastructure Requirements
1. **Compute**: 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**: 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.

## Tested Configuration
- **Template**: jvm-21
- **Runtime**: java
- **Size**: s-1vcpu-2gb
- **Build Command**: ./mvnw -q -DskipTests package
- **Start Command**: java -jar $(ls target/*.jar | grep -v -- '-plain' | head -n 1)

## 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**: Copy the approach into your schema; keep migrations idempotent and run them with --release-command.
3. **Deploy**: 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. Command: `ample deploy . --name  --public`
4. **Verify**: 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`. Command: `ample logs  --kind build`

## Examples
- **Spring Boot Pattern Fixture**: Multi-pattern Spring Boot app whose durable job state module was checked live; the module is under tests/deploy-canaries/_pattern-modules.

## Success Checks
1. App responds on its public URL. Kind: http_get, Path: /, Expect: ample canary spring boot patterns.
2. Durable-job-state self-test. Kind: http_get, 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 chat application itself was not separately tested; the pattern checks are what was verified.

## Cost Estimate
- **Monthly Amount**: $10.00 (currency: USD)
- **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)
- **Note**: Always-on monthly price of the tested sizes; apps and databases auto-pause when idle.

## Evidence Summary
1. **Canary Run**: Spring Boot pattern fixture deployed on Ample with checks passed for durable-job-state and configuration-secrets.
- **Observed At**: 2026-09-21T02:34:39Z
- **Implementation Revision**: 1d28ae0-dirty (CLI 0.1.21)
- **Expires At**: 2027-03-20T02:34:39Z

2. **Canary Run**: The same Spring Boot app deployed with a --release-command migration; the marker it created was readable after activation.
- **Observed At**: 2026-09-20T22:49:19Z
- **Implementation Revision**: af6f45adea26-dirty (CLI af6f45a)
- **Expires At**: 2027-03-19T22:49:19Z

## Next Actions
- **Browse the catalog index**: Browse the catalog index.
- **Search published recipes**: Search published recipes by intent, stack and constraints.
- **Prepare a deployment plan**: Prepare a side-effect-free deployment plan for an authorized project.
- **Read existing authentication setup**: Read the existing agent authentication setup.
- **Browse AI chat application**: Browse AI chat application.
- **Browse Spring Boot**: Browse Spring Boot.
- **Browse Durable job state**: Browse Durable job state.
- **Browse Deploy AI app**: Browse Deploy AI app.