page:guides:spring boot:database connection

Connect Postgres for Spring Boot

Database connection for a Spring Boot app on Ample. Verified on Spring Boot: 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 (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.

Prerequisites

• A Spring Boot project (./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
• 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. 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. Command: ample logs --kind build

Examples

• Spring Boot pattern fixture
  Verified database connection on Spring Boot.
  Source: tests/deploy-canaries/spring-boot-patterns

Success Checks

• app responds on its public URL
  Kind: http_get
  Path: /
  Expect: ample canary spring boot patterns
• relational-records check from the example
  Kind: http_get
  Path: /p/relational-records
  Expect: see the pattern fixture checks

Limitations

• Verified on the jvm-21 template at s-1vcpu-2gb; other sizes and Spring Boot 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

• Currency: USD
• Monthly Amount: $10.00
• 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: $5.00
  • Managed PostgreSQL database
    Size: s-1vcpu-1gb, Quantity: 1.0, Monthly Amount: $5.00
• Note: Always-on monthly price of the tested sizes; apps auto-pause when idle. Buckets are allocation-priced per quota and not included.

Evidence Summary

• Kind: canary_run
  Summary: Spring Boot pattern fixture deployed on Ample (...); for this guide: a managed PostgreSQL database auto-provisioned and injected as DATABASE_URL, with real queries succeeding at request time (records=ok).
  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/relational-records
  • Template: jvm-21

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.