## Host csv import tool with Spring Boot: relational workflow state

### Summary
Deploy a csv import tool built with Spring Boot on Ample using the transactional workflows 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: an optimistic version check and an event row written in the same transaction, a stale update rejected, and a history query over the application-owned events (history=2 conflict=rejected). Not separately tested: your domain records, validation rules and concurrency policy; treat the csv import tool-specific behavior as your application code.

### Representative Queries
- Host csv import tool with Spring Boot: relational workflow state
- Where can I host CSV import tool built with Spring Boot?
- I need a domain record schema, validation rules and concurrency behavior.

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

### Infrastructure Requirements
#### 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.

#### 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.

### Framework
**Spring Boot**

### Workload
**CSV import tool**

### Release Status
**Published**

### Support Status
**Verified**

### Execution Status
**Ready**

### 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**: ./mvnw -q -DskipTests package
- **Start**: 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**  
   `The fixture's module implements transactional workflows: an optimistic version check and an event row written in the same transaction, a stale update rejected, and a history query over the application-owned events (history=2 conflict=rejected). 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/transactional-workflows) from the example; then run your own checks. On failure read `ample logs  --kind build` then `--kind runtime`.`  
   Command: `ample logs  --kind build`

### Example
- **Title**: Spring Boot pattern fixture
  - **Description**: Multi-pattern Spring Boot app whose transactional workflows module was checked live; the module is under tests/deploy-canaries/_pattern-modules.
  - **Source Reference**: tests/deploy-canaries/spring-boot-patterns

### Success Checks
1. **App responds on its public URL**  
   - **Kind**: http_get
   - **Path**: / 
   - **Expect**: ample canary spring boot patterns
2. **Transactional-workflows self-test**  
   - **Kind**: http_get
   - **Path**: /p/transactional-workflows 
   - **Expect**: tx=ok history=2 conflict=rejected

### 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 csv import tool itself (your domain records, validation rules and concurrency policy) 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.

### Cost Estimate
- **Currency**: USD
- **Monthly Amount**: 10.0
- **Authoritative**: true
- **Basis**: size prices from pricing.toml (loaded by the API) at build revision 1ac5595375130d45290090e82ed0f554ccd45405-dirty.
- **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. Buckets are allocation-priced per quota and not included.

### Evidence Summary
1. **Kind**: canary_run
   - **Summary**: Spring Boot pattern fixture deployed on Ample (./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); checks passed for transactional-workflows 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
   - **Scope**: 
     - **Checks**: /p/transactional-workflows
     - **Pattern**: pattern:transactional-workflows
     - **Template**: jvm-21
2. **Kind**: canary_run
   - **Summary**: 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
   - **Scope**: 
     - **Pattern**: pattern:transactional-workflows

### Last Verified At
2026-09-21T02:34:39Z

### Unknowns
- Region availability is unknown until a verified region fact is recorded.
- Compliance attestations are unknown; none are claimed.

### Formats
- **HTML**: [Link](/content/recipes/csv-import-tool/spring-boot/relational-workflow/index.html)
- **Markdown**: [Link](/content/recipes/csv-import-tool/spring-boot/relational-workflow.md)
- **JSON**: [Link](https://api.ample.computer/v1/catalog/recipes/page%3Arecipes%3Acsv-import-tool%3Aspring-boot%3Arelational-workflow)

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  - **Operation ID**: plan_deployment  
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  - **Label**: Browse CSV import tool  
  - **Operation ID**: browse_node  
  - **Method**: GET  
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  - **Origin**: api  
  - **Parameters**: {"nodeId":"workload:csv-import-tool"}
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- **Action ID**: browse:pattern:transactional-workflows  
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  - **Operation ID**: browse_node  
  - **Method**: GET  
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