page:recipes:mcp server:spring boot:response streaming

Host MCP Server with Spring Boot: Streamed Responses

Deploy a MCP server built with Spring Boot on Ample using the streaming response service 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 Server-Sent Events endpoint read incrementally through the public HTTPS gateway: five one-second chunks arrived spread over time with the first within seconds (not buffered), a 70-second stream of 36 chunks completed past common 60-second idle timeouts, and a client that disconnected after two chunks was observed and recorded by the server (disconnected=true). Not separately tested: your event schema, reconnection strategy and any per-request duration ceiling beyond the 70 seconds measured; treat the MCP server-specific behavior as your application code.

Summary

• Deploy a MCP server with auto-provisioned PostgreSQL.
• Verify server behavior and response streaming pattern.

Representative Queries

• Host MCP server with Spring Boot: streamed responses.
• Where can I host the MCP server built with Spring Boot?
• I need a tested end-to-end streaming transport, timeout behavior and client disconnect handling.

Resource Requirements

• Compute
• Postgres

Infrastructure Requirements

Compute: Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.

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.

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.

2. Implement the pattern on PostgreSQL:

   • The fixture's module implements streaming response service: a Server-Sent Events endpoint.

3. Deploy:

   • Run the synchronous deploy once and read the result (exit 0 live, 1 failed, 2 blocked).
   • ample deploy . --name <yourAppName> --public

4. Verify:

   • Fetch the live URL and the pattern self-test route(s) from the example; then run your own checks.
   • ample logs --kind build

Examples

• Spring Boot pattern fixture:
  • Multi-pattern Spring Boot app whose streaming response service module was checked live.

Success Checks

• App responds on its public URL.
• Streaming-response-service self-test: checks for outcomes of data transmission.

Limitations

• Verified on the jvm-21 template; other sizes and versions not verified.
• MCC server checks are application code and not tested separately.

Cost Estimate

• Monthly Amount: $10.00
  • Breakdown:
    • App server: $5.00
    • Managed PostgreSQL database: $5.00

Evidence Summary

• Spring Boot pattern fixture deployed on Ample with passed checks for streaming-response-service and configuration-secrets.

Unknowns

• Region availability and compliance attestations are unknown.