FilteredList在更新时提供java.lang.ArrayIndexOutOfBoundsException

Question

我创建了一个简单的应用程序来测试过滤列表及其相应源列表更改时的行为.我也想测试更新更改,所以我创建ObservableList了ObservableLists.它比创建具有可观察字段的其他类(如Person)更快更简单.

代码看起来如此:

    ListChangeListener<ObservableList<String>> changeNotifier = new ListChangeListener<ObservableList<String>>() {
        @Override
        public void onChanged(Change<? extends ObservableList<String>> c) {
            while (c.next()) {
                if (c.wasPermutated()) {
                    System.out.println("permutation");
                } else if (c.wasUpdated()) {
                    System.out.println("update");
                } else {
                    if (c.wasRemoved()) {
                        System.out.println("remove");
                    }
                    if (c.wasAdded()) {
                        System.out.println("add");
                    }
                    if (c.wasReplaced()) {
                        System.out.println("replace");
                    }
                }
            }
        }
    };
    Callback<ObservableList<String>, Observable[]> identityExtractor = new Callback<ObservableList<String>, Observable[]>() {
        @Override
        public Observable[] call(ObservableList<String> param) {
            return new Observable[]{param};
        }
    };
    Predicate<ObservableList<String>> nonEmptyFilter = new Predicate<ObservableList<String>>() {
        @Override
        public boolean test(ObservableList<String> obsl) {
            boolean nonEmpty = ! obsl.isEmpty();
            for (String item : obsl) {
                nonEmpty = nonEmpty && (null != item) && ("" != item);
            };
            return nonEmpty;
        }
    };

    ObservableList<ObservableList<String>> basicSimple = FXCollections.observableArrayList();
    ObservableList<ObservableList<String>> basicComposed = FXCollections.observableArrayList( identityExtractor );

    ObservableList<ObservableList<String>> filteredSimple = basicSimple.filtered( nonEmptyFilter );
    ObservableList<ObservableList<String>> filteredComposed = basicComposed.filtered( nonEmptyFilter );

    System.out.println("Basic testing");

    System.out.println("Add invalid");
    basicSimple.addAll( FXCollections.observableArrayList("") );
    System.out.println( basicSimple );
    System.out.println( filteredSimple );

    System.out.println("Make it valid");
    basicSimple.get(0).addAll("first");
    System.out.println( filteredSimple );

    System.out.println("Add valid");
    basicSimple.addAll( FXCollections.observableArrayList("Second") );
    System.out.println( filteredSimple );

    System.out.println("Composed testing");

    System.out.println("Add invalid");
    basicComposed.addAll( FXCollections.observableArrayList("") );
    System.out.println( basicComposed );
    System.out.println( filteredComposed );

    System.out.println("Make it valid");
    basicComposed.get(0).addAll("first");
    System.out.println( filteredComposed );

    System.out.println("Add valid");
    basicComposed.addAll( FXCollections.observableArrayList("Second") );
    System.out.println( filteredComposed );

我在测试期间发现了一个奇怪的错误:

[info] Running helloworld.HelloWorld 
Basic testing
Add invalid
[[]]
[]
Make it valid
[]
Add valid
[[Second]]
Composed testing
Add invalid
[[]]
[]
Make it valid
[error] (JavaFX Application Thread) java.lang.ArrayIndexOutOfBoundsException
java.lang.ArrayIndexOutOfBoundsException
        at java.lang.System.arraycopy(Native Method)
        at javafx.collections.transformation.FilteredList.updateFilter(FilteredList.java:298)
        at javafx.collections.transformation.FilteredList.update(FilteredList.java:239)
        at javafx.collections.transformation.FilteredList.sourceChanged(FilteredList.java:137)
        at javafx.collections.transformation.TransformationList.lambda$getListener$16(TransformationList.java:106)
        at javafx.collections.transformation.TransformationList$$Lambda$63/1596532574.onChanged(Unknown Source)
        at javafx.collections.WeakListChangeListener.onChanged(WeakListChangeListener.java:88)
        at com.sun.javafx.collections.ListListenerHelper$SingleChange.fireValueChangedEvent(ListListenerHelper.java:164)
        at com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:73)
        at javafx.collections.ObservableListBase.fireChange(ObservableListBase.java:233)
        at javafx.collections.ListChangeBuilder.commit(ListChangeBuilder.java:485)
        at javafx.collections.ListChangeBuilder.endChange(ListChangeBuilder.java:541)
        at javafx.collections.ObservableListBase.endChange(ObservableListBase.java:205)
        at com.sun.javafx.collections.ObservableListWrapper.access$200(ObservableListWrapper.java:45)
        at com.sun.javafx.collections.ObservableListWrapper$1$1.invalidated(ObservableListWrapper.java:75)
        at com.sun.javafx.collections.ListListenerHelper$SingleInvalidation.fireValueChangedEvent(ListListenerHelper.java:126)
        at com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:73)
        at javafx.collections.ObservableListBase.fireChange(ObservableListBase.java:233)
        at javafx.collections.ListChangeBuilder.commit(ListChangeBuilder.java:482)
        at javafx.collections.ListChangeBuilder.endChange(ListChangeBuilder.java:541)
        at javafx.collections.ObservableListBase.endChange(ObservableListBase.java:205)
        at javafx.collections.ModifiableObservableListBase.addAll(ModifiableObservableListBase.java:102)
        at javafx.collections.ObservableListBase.addAll(ObservableListBase.java:245)
        at helloworld.HelloWorld.start(HelloWorld.java:87)
        at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$153(LauncherImpl.java:821)
        at com.sun.javafx.application.LauncherImpl$$Lambda$55/7143454.run(Unknown Source)
        at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$166(PlatformImpl.java:323)
        at com.sun.javafx.application.PlatformImpl$$Lambda$51/397137382.run(Unknown Source)
        at com.sun.javafx.application.PlatformImpl.lambda$null$164(PlatformImpl.java:292)
        at com.sun.javafx.application.PlatformImpl$$Lambda$53/1802784360.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.javafx.application.PlatformImpl.lambda$runLater$165(PlatformImpl.java:291)
        at com.sun.javafx.application.PlatformImpl$$Lambda$52/1184782272.run(Unknown Source)
        at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
        at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
        at com.sun.glass.ui.gtk.GtkApplication.lambda$null$45(GtkApplication.java:126)
        at com.sun.glass.ui.gtk.GtkApplication$$Lambda$43/450111611.run(Unknown Source)
        at java.lang.Thread.run(Thread.java:745)
[trace] Stack trace suppressed: run last compile:run for the full output.
[]
Add valid
[[Second]]

basicSimple和之间的区别basicComposed是后者定义了一个提取器,因此它接收更新事件.在处理更新事件的过程中,本机代码抛出异常.我应该考虑使示例代码正常工作？

---

一点调试

我已经将println插入到nonEmptyFilter谓词测试的末尾.它正常工作,并传递给它的ObservableList是刚刚更新的预期新值.稍后当FilteredList的某些iternal代码正在执行时发生错误.

Answer 1

这看起来像一个bug; 我认为它可能与这个相同,bug报告称其为JavaFX 8u60修复(对于8u40来说可能太晚了).

我测试了1.8.0_40-ea-b23 ?? 和1.9.0-ea-b49两个版本都出现了错误.如果目前有一个1.8.0u60的ea版本,我不知道在哪里可以找到它.