Proposal: Canton Spring Boot Starter for Ledger Apps

OPENPull Request

by deepthi-253123-03-2026Needs Champion

canton-apis

Development Fund Proposal Submission

Proposal file: /proposals/canton-spring-boot-starter-for-ledger-apps.md

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Summary

This proposal requests funding for an open-source Spring Boot starter and backend integration toolkit for Canton-connected ledger applications. It delivers reusable Spring-native runtime patterns for participant connectivity, projection checkpointing, replay-safe processing, idempotent submission, health and metrics integration, local Testcontainers-based testing, and reference backend services that reduce adoption friction for enterprise JVM teams.

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Checklist

[x] Proposal file added under /proposals/
[x] Milestones and funding amounts defined
[x] Acceptance criteria included
[x] Alignment with Canton priorities described

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Notes for Reviewers

This proposal is scoped to the backend service-runtime layer for JVM/Spring teams, not as a replacement for general-purpose SDKs, AppKit, or DevKit-style tooling. The first release is deliberately narrow and reviewable, with an explicit v1 support matrix, two concrete reference-service archetypes, and a documented pilot evaluation run used to harden the starter before final release.