CasC allows duplicate entries for single valued Describables without warning.

[jtnord]

Jenkins and plugins versions report

Environment

from jenkinsci/oic-auth-plugin#436 , otherwise unknown

What Operating System are you using (both controller, and any agents involved in the problem)?

N/A

Reproduction steps

1. Create a config as code snippet with 2 different conflicting options for a describable.

e.g.

jenkins:
  securityRealm:
    oic:
      serverConfiguration:
        # Automatic config of endpoint
        wellKnown:
          wellKnownOpenIDConfigurationUrl: "https://myid.com/.well-known/openid-configuration"
        # Manual config of endpoint
        manual:
          authorizationServerUrl: "https://myid.com/authorize"
          issuer: "https://myid.com/"
          jwksServerUrl: "https://myid.com/jwks"
          tokenServerUrl: "https://myid.com/token"
          userInfoServerUrl: "https://myid.com/userInfo"
          useRefreshTokens: false
      # Credentials
      clientId: "myclient-01"
      clientSecret: "supersecret"
      # claims

2. start Jenkins with this casc file

serverConfiguration is a single valued Describable, yet the config contains two conflicting values for the above.

Expected Results

the startup should error or warn as the configuration is invalid

Actual Results

no warning / error

Anything else?

No response

[timja]

You don't happen to have the merge strategy enabled?

https://github.com/jenkinsci/configuration-as-code-plugin/blob/8b9efc1b9026942064d5248c92bf89cb00f83ea0/docs/features/mergeStrategy.md