Reports unresolved and deprecated configuration keys and invalid values in Spring Boot application .yaml configuration files, which can lead to runtime errors.

Example:

server:
  port: invalid # Reports 'Cannot convert 'invalid' to java.lang.Integer'

If a deprecated configuration key has a replacement key, you can apply the 'Use replacement key' quick-fix.

Example:

logging:
  path: ${path} # Reports 'Deprecated configuration property 'logging.path''

After the quick-fix is applied:

logging:
  file:
    path: ${path}

If a configuration key is not defined in spring-configuration-metadata.json, you can apply the 'Define configuration key' quick-fix that creates the META-INF/spring-additional-configuration-metadata.json file and defines the necessary key.

Example:

new:
  key: value # Reports 'Cannot resolve configuration property 'new.key''

After the quick-fix is applied, the following is added to META-INF/spring-additional-configuration-metadata.json:

{
  "properties": [
    {
      "name": "new.key",
      "type": "java.lang.String",
      "description": "Description for new.key."
    }
  ]
}

Use the Replacement tokens option to define tokens used for value placeholders in configuration files. These tokens are specified in the form beginToken*endToken. Without the *, the token is assumed to be the same for start and end.

For example, the default is @ for both start and end token, which enables you to define placeholders, such as some.property=@another.property@.

Values inside the replacement token (@property.key@) will not be highlighted.