src/java.compiler/share/classes/javax/lang/model/element/PackageElement.java

*** 81,92 ****
       * @jls 7.4.2 Unnamed Packages
       */
      boolean isUnnamed();
  
      /**
!      * Returns the enclosing module.
       *
!      * @return the enclosing module
       */
      @Override
      Element getEnclosingElement();
  }
--- 81,99 ----
       * @jls 7.4.2 Unnamed Packages
       */
      boolean isUnnamed();
  
      /**
!      * Returns the enclosing module if such a module exists; otherwise
!      * returns {@code null}.
       *
!      * One situation where a module does not exist for a package is if
!      * the environment does not include modules, such as an annotation
!      * processing environment configured for a {@linkplain
!      * javax.annotation.processing.ProcessingEnvironment#getSourceVersion
!      * source version} without modules.
!      *
!      * @return the enclosing module or {@code null} if no such module exists
       */
      @Override
      Element getEnclosingElement();
  }