code: protected void unsetJcaRuntimeVersion(JCARuntimeVersion ref) {
          Version toUnset = ref.getVersion();
  
          // If we are removing the jca feature completely, unset jca version to DEFAULT_VERSION
          if (runtimeVersion.getVersion().compareTo(toUnset) == 0)
              runtimeVersion = DEFAULT_VERSION;
      }
docs: Declarative Services method for unsetting the JCA feature version
  
  @param ref the version