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  1. JDK
  2. JDK-8187606

Single step bindings created via Bindings.select*(...) do not update on change

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    • Subcomponent:
    • CPU:
      generic
    • OS:
      generic

      Description

      FULL PRODUCT VERSION :
      java version "1.8.0_144"
      Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
      Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

      ADDITIONAL OS VERSION INFORMATION :
      Microsoft Windows [Version 6.1.7601]

      A DESCRIPTION OF THE PROBLEM :
      If I create a single step binding via Bindings.select, e.g. Bindings.select(a, "b"), then modifications of member a.b are not propagated to the binding. As a consequence, the binding is neither invalidated nor updated when binding.getValue() is called.

      However, multi step bindings (a.b.c) work as expected.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Create and run the JUnit test posted in the "source code for an executable test case" below.


      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      All three unit test cases complete successfully.
      ACTUAL -
      The following test case fails: testBindings_select_MenuItem_text

      Failure: org.junit.ComparisonFailure: expected:<item[_changed]> but was:<item[]>
      at org.junit.Assert.assertEquals(Assert.java:115)
      at org.junit.Assert.assertEquals(Assert.java:144)
      at PropertyBindingTest.testBindings_select_MenuItem_text(PropertyBindingTest.java:27)






      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import static org.junit.Assert.assertEquals;

      import org.junit.Before;
      import org.junit.Test;

      import javafx.beans.binding.Bindings;
      import javafx.beans.binding.StringBinding;
      import javafx.scene.control.Menu;
      import javafx.scene.control.MenuItem;

      public class PropertyBindingTest {

      private Menu menu = new Menu("menu");
      private MenuItem item = new MenuItem("item");

      @Before
      public void setUp() {
      menu.getItems().add(item);
      }

      @Test
      public void testBindings_select_MenuItem_text() {
      StringBinding binding = Bindings.selectString(item, "text");
      assertEquals("item", binding.getValue());

      item.setText("item_changed");
      assertEquals("item_changed", binding.getValue());
      }

      @Test
      public void testBindings_select_MenuItem_parentMenu_text() {
      StringBinding binding = Bindings.selectString(item, "parentMenu", "text");
      assertEquals("menu", binding.getValue());

      menu.setText("menu_changed");
      assertEquals("menu_changed", binding.getValue());
      }
      }

      ---------- END SOURCE ----------

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            • Assignee:
              Unassigned
              Reporter:
              webbuggrp Webbug Group
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              • Created:
                Updated: