@ConfigurationProperties(value = "optaplanner", ignoreUnknownFields = false)
public class OptaPlannerProperties {

    public static final String DEFAULT_SOLVER_CONFIG_URL = "solverConfig.xml";

    /**
     * A classpath resource to read the solver configuration XML.
     * Defaults to {@value DEFAULT_SOLVER_CONFIG_URL}.
     * If this property isn't specified, that solverConfig.xml is optional.
     */
    private String solverConfigXml;

    // code omitted
}

{
  // ...
  "properties": [
    {
      "name": "optaplanner.solver-config-xml",
      "type": "java.lang.String",
      "description": "A classpath resource to read the solver configuration XML. Defaults to {@value DEFAULT_SOLVER_CONFIG_URL}. If this property isn't specified, that solverConfig.xml is optional.",
      "sourceType": "org.optaplanner.spring.boot.autoconfigure.OptaPlannerProperties"
    }
    // ...
  ]
  // ...
}