## Host approval workflow with Spring Boot: private attachments

### Summary
Deploy a approval workflow built with Spring Boot on Ample using the private document library 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, a private S3-compatible bucket holds objects with credentials delivered as encrypted environment variables. Verified on Spring Boot: a role-to-document access model with negative tests (401 without identity, 403 for the wrong role) and a private-bucket round-trip for the allowed role (private=ok). Not separately tested: your identity integration and role assignments; treat the approval workflow-specific behavior as your application code.

### Representative Queries
- Host approval workflow with Spring Boot: private attachments
- Where can I host Approval workflow built with Spring Boot?
- I need attachment metadata, access checks and a tested private object access path.

### Resource Requirements
- primitive:compute
- primitive:postgres
- primitive:s3-compatible-object-storage

### 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.
3. **S3-compatible object storage**  
   **Status**: verified  
   **Summary**: Buckets are S3-compatible with issued credentials; PutObject and GetObject are verified by canary. Other S3 operations are not verified.

### 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)
- A bucket from `ample bucket create` with its credentials passed as encrypted S3_* environment variables
- An Ample account token with servers:write, databases:read, buckets:read

### Workflow Steps
1. **Build and start**  
   Body: `./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**  
   Body: `The fixture's module implements private document library: a role-to-document access model with negative tests (401 without identity, 403 for the wrong role) and a private-bucket round-trip for the allowed role (private=ok). Copy the approach into your schema; keep migrations idempotent and run them with --release-command.`
3. **Wire object storage**  
   Body: `Create the bucket(s), then pass endpoint, region, bucket and keys as --env values. Use path-style addressing. Keep private data in an unpublished bucket.`
4. **Deploy**  
   Body: `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 --env S3_ENDPOINT=... --env S3_REGION=... --env S3_BUCKET=... --env S3_ACCESS_KEY_ID=... --env S3_SECRET_ACCESS_KEY=...`
5. **Verify**  
   Body: `Fetch the live URL and the pattern self-test route(s) (/p/private-document-library) from the example; then run your own checks. On failure read 
   
   `ample logs  --kind build` then `--kind runtime`. `
   Command: `ample logs  --kind build`

### 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 approval workflow itself (your identity integration and role assignments) is application code and was not separately tested; the pattern checks are what was verified.
- Region, compliance attestations and request-duration limits are unknown and not claimed.
- Apps auto-pause when idle and wake on the next request; always-on is an operator setting, not a plan feature.
- Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures are not verified; apps and their databases are placed together.
- PutObject and GetObject with path-style addressing are verified; multipart upload, listing, presigned URLs and lifecycle rules are not verified.

### Cost Estimate
- **Currency**: USD  
- **Monthly Amount**: 10.0  
- **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.

### Next Actions
1. **Browse the catalog index**  
   Method: GET  
   Relative Path: /v1/catalog  
   Requires Authentication: false

2. **Search published recipes by intent, stack and constraints**  
   Method: POST  
   Relative Path: /v1/catalog/search  
   Requires Authentication: false  
   Parameters: 
   - body: {"limit":5,"query":"Host approval workflow with Spring Boot: private attachments"}

3. **Prepare a side-effect-free deployment plan for an authorized project**  
   Method: POST  
   Relative Path: /v1/catalog/plan  
   Requires Authentication: true  
   Parameters:  
   - body: {"inputs":{},"projectId":"","recipeId":"page:recipes:approval-workflow:spring-boot:private-attachments","recipeRevision":"r1"}

4. **Read the existing agent authentication setup**  
   Method: GET  
   Relative Path: /mcp/setup  
   Requires Authentication: false

5. **Browse Approval workflow**  
   Method: GET  
   Relative Path: /v1/catalog/nodes/workload%3Aapproval-workflow  
   Requires Authentication: false

6. **Browse Spring Boot**  
   Method: GET  
   Relative Path: /v1/catalog/nodes/stack%3Aframework-spring-boot  
   Requires Authentication: false

7. **Browse Private document library**  
   Method: GET  
   Relative Path: /v1/catalog/nodes/pattern%3Aprivate-document-library  
   Requires Authentication: false

8. **Browse Deploy web app**  
   Method: GET  
   Relative Path: /v1/catalog/nodes/intent%3Adeploy-web-app  
   Requires Authentication: false