Vault database - datasource username and password not populated when multiple databases use same vault db role

[nipr-jdoenges]

Describe the bug

When using cloud.vault.databases to configure multiple datasources, it appears that username/password datasource properties don't get set if more than one entry refers to the same vault database role.

Our use case is an application that uses 2 separate databases in some environments, while in other environments rather than using 2 different databases, the application uses 2 different schemas co-located in the same database.

Spring cloud version: 2025.0.0

Sample

Highly abstracted, of course

Does not work:

  cloud:
    vault:
      databases:
        primary:
          enabled: true
          role: db1-dbuser
          backend: database/
          static-role: true
          username-property: spring.datasource.username
          password-property: spring.datasource.password
        other-database:
          enabled: true
          role: db1-dbuser
          backend: database/
          static-role: true
          username-property: spring.secondary-datasource.username
          password-property: spring.secondary-datasource.password

Works:

  cloud:
    vault:
      databases:
        primary:
          enabled: true
          role: db1-dbuser
          backend: database/
          static-role: true
          username-property: spring.datasource.username
          password-property: spring.datasource.password
        other-database:
          enabled: true
          role: db2-dbuser
          backend: database/
          static-role: true
          username-property: spring.secondary-datasource.username
          password-property: spring.secondary-datasource.password