[2482824077] Upstream Reporter: Long Zhang
Upstream issue status: Closed
Upstream description:

Describe the bug

As mentioned in the documentation here, we need to set up the Backstage permission framework first.

For the new Backend system, I added the following code to packages/backend/src/index.ts:

backend.add(import('@backstage/plugin-permission-backend/alpha'));
backend.add(import('@janus-idp/backstage-plugin-rbac-backend'));

When run yarn dev from the root folder, I get the following error:

[1]             throw new Error(`Plugin '${r.pluginId}' is already registered`);
[1]                   ^
[1] Error: Plugin 'permission' is already registered

I find that both @backstage/plugin-permission-backend/alpha and @janus-idp/backstage-plugin-rbac-backend use the same plugin id (permission), but I am not sure about how to fix it.

Expected Behavior

Backstage is up and running.

What are the steps to reproduce this bug?

1. Follow the example here to setup Backstage permission framework
2. Add @janus-idp/backstage-plugin-rbac-backend
3. run yarn dev from the root folder

Versions of software used and environment

• Backstage 1.27.0
• @backstage/plugin-permission-backend 0.5.42
• @janus-idp/backstage-plugin-rbac-backend@npm 4.10.0