src/java.compiler/share/classes/javax/lang/model/util/AbstractTypeVisitor7.java

*** 87,93 ****
--- 87,94 ----
       *
       * @param t  {@inheritDoc}
       * @param p  {@inheritDoc}
       * @return the result of the visit as defined by a subclass
       */
+     @Override
      public abstract R visitUnion(UnionType t, P p);
  }