--- a/jdk/src/java.base/share/classes/java/nio/channels/spi/AbstractSelector.java	Tue Aug 01 15:30:13 2017 -0700
+++ b/jdk/src/java.base/share/classes/java/nio/channels/spi/AbstractSelector.java	Tue Aug 01 16:08:17 2017 -0700
@@ -70,7 +70,7 @@
     extends Selector
 {
 
-    private AtomicBoolean selectorOpen = new AtomicBoolean(true);
+    private final AtomicBoolean selectorOpen = new AtomicBoolean(true);
 
     // The provider that created this selector
     private final SelectorProvider provider;