src/java.base/share/classes/sun/nio/ch/SelectorImpl.java

*** 50,61 ****
      private Set<SelectionKey> publicKeys;             // Immutable
      private Set<SelectionKey> publicSelectedKeys;     // Removal allowed, but not addition
  
      protected SelectorImpl(SelectorProvider sp) {
          super(sp);
!         keys = new HashSet<SelectionKey>();
!         selectedKeys = new HashSet<SelectionKey>();
          if (Util.atBugLevel("1.4")) {
              publicKeys = keys;
              publicSelectedKeys = selectedKeys;
          } else {
              publicKeys = Collections.unmodifiableSet(keys);
--- 50,61 ----
      private Set<SelectionKey> publicKeys;             // Immutable
      private Set<SelectionKey> publicSelectedKeys;     // Removal allowed, but not addition
  
      protected SelectorImpl(SelectorProvider sp) {
          super(sp);
!         keys = new HashSet<>();
!         selectedKeys = new HashSet<>();
          if (Util.atBugLevel("1.4")) {
              publicKeys = keys;
              publicSelectedKeys = selectedKeys;
          } else {
              publicKeys = Collections.unmodifiableSet(keys);