--- /dev/null	2018-03-13 16:58:30.000000000 +0200
+++ new/modules/javafx.base/src/main/java/com/sun/javafx/binding/BooleanConstant.java	2018-03-13 16:58:16.620252100 +0200
@@ -0,0 +1,48 @@
+package com.sun.javafx.binding;
+
+import javafx.beans.InvalidationListener;
+import javafx.beans.value.ChangeListener;
+import javafx.beans.value.ObservableBooleanValue;
+
+public class BooleanConstant implements ObservableBooleanValue {
+
+    private final boolean value;
+
+    private BooleanConstant(boolean value) {
+        this.value = value;
+    }
+
+    public static BooleanConstant valueOf(boolean value) {
+        return new BooleanConstant(value);
+    }
+
+    @Override
+    public boolean get() {
+        return value;
+    }
+
+    @Override
+    public Boolean getValue() {
+        return value;
+    }
+
+    @Override
+    public void addListener(ChangeListener<? super Boolean> listener) {
+        // no-op
+    }
+
+    @Override
+    public void removeListener(ChangeListener<? super Boolean> listener) {
+        // no-op
+    }
+
+    @Override
+    public void addListener(InvalidationListener listener) {
+        // no-op
+    }
+
+    @Override
+    public void removeListener(InvalidationListener listener) {
+        // no-op
+    }
+}