Same symptom as the open thread "Railpack / Metal builder fails before application build - secret N not found" (station.railway.com/questions/railpack-metal-builder-fails-before-ap-1a946b05), but on a Java 21 + Maven service, EU West, and the missing secret name is an empty string instead of N.

Build log:

using build driver railpack-v0.38.0

load build definition from ./railpack-plan.json

install mise packages: java (136ms)

install mise packages: java, maven (115ms)

Build Failed: build daemon returned an error < failed to solve: secret ID missing for '' environment variable >

Fails before Maven even runs, same as the linked thread fails before dependency install.

What I ruled out:

• No Dockerfile / railway.json / nixpacks.toml in the repo, Railpack default detection only.
• • Compared against the last successful deploy from 3 days ago: no build-related config changed since then, only app code and one new Maven dependency.
• • Checked all 6 custom Service Variables (CORS_ALLOWED_ORIGINS, DATABASE_URL, JWT_SECRET, SPRING_DATASOURCE_PASSWORD, SPRING_DATASOURCE_URL, SPRING_DATASOURCE_USERNAME) plus the 8 Railway-provided ones, none empty or malformed.
• • status.railway.com shows Fully Operational for EU West Builds/Deployments.
• • Retried 3 times including a fresh empty commit to force a new build, same failure every time within 12-14s on a Metal builder.

Project: content-healing / production / sportzlink-backend

Repo: redesvanessa88/sportzlink (private), root directory /backend

Region: EU West

Railpack: 0.38.0