Java SwingX自动完成转换器JTextField错误
我正在测试SwingX自动完成计算器,我使用的代码如下:Java SwingX自动完成转换器JTextField错误,java,swing,autocomplete,jtextfield,swingx,Java,Swing,Autocomplete,Jtextfield,Swingx,我正在测试SwingX自动完成计算器,我使用的代码如下: import javax.swing.text.JTextComponent; import javax.swing.JFrame; import javax.swing.JTextField; import javax.swing.JPanel; import javax.swing.JList; import org.jdesktop.swingx.autocomplete.*; public class Test extends
import javax.swing.text.JTextComponent;
import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JPanel;
import javax.swing.JList;
import org.jdesktop.swingx.autocomplete.*;
public class Test extends JFrame
{
public Test()
{
this.setTitle("Testing");
JPanel pan = new JPanel();
JTextComponent test = new JTextField();
((JTextField)test).setColumns(20);
String[] data = {"one", "two", "three", "four"};
JList dataList = new JList(data);
AutoCompleteDecorator.decorate(dataList, test);
pan.add(test);
this.setContentPane(pan);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setBounds(280,150,500,200);
}
public static void main(String[] args)
{
Test t = new Test();
}
}
最后,我收到了一条巨大的运行时错误消息,我并不想发布堆栈跟踪,原因是线程“AWT-EventQueue-0”java.lang.NullPointerException中出现异常:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at org.jdesktop.swingx.autocomplete.ListAdaptor.valueChanged(ListAdaptor.java:77)
at javax.swing.JList.fireSelectionValueChanged(JList.java:1798)
at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1812)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:184)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:164)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:211)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:405)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:415)
at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:459)
at javax.swing.JList.setSelectedIndex(JList.java:2212)
at javax.swing.JList.setSelectedValue(JList.java:2362)
at org.jdesktop.swingx.autocomplete.ListAdaptor.setSelectedItem(ListAdaptor.java:99)
at org.jdesktop.swingx.autocomplete.AutoCompleteDocument.setSelectedItem(AutoCompleteDocument.java:355)
at org.jdesktop.swingx.autocomplete.AutoCompleteDocument.insertString(AutoCompleteDocument.java:303)
at javax.swing.text.JTextComponent.replaceSelection(JTextComponent.java:1386)
at javax.swing.text.DefaultEditorKit$DefaultKeyTypedAction.actionPerformed(DefaultEditorKit.java:884)
at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1664)
at javax.swing.JComponent.processKeyBinding(JComponent.java:2879)
at javax.swing.JComponent.processKeyBindings(JComponent.java:2926)
at javax.swing.JComponent.processKeyEvent(JComponent.java:2842)
at java.awt.Component.processEvent(Component.java:6282)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1895)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:762)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1027)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:899)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:727)
at java.awt.Component.dispatchEventImpl(Component.java:4731)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.awt.EventQueue$3.run(EventQueue.java:686)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:702)
at java.awt.EventQueue$4.run(EventQueue.java:700)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
我遗漏了什么?这是一个bug:罪魁祸首是一个null ObjectToStringConverter,它使用两个参数的方法用JList的项来装饰textComponent:
public static void decorate(JList list, JTextComponent textComponent) {
decorate(list, textComponent, null);
}
快速修复方法是使用三参数方法并传入默认转换器:
JTextComponent test = new JTextField(20);
String[] data = {"one", "two", "three", "four"};
JList dataList = new JList(data);
AutoCompleteDecorator.decorate(dataList, test, ObjectToStringConverter.DEFAULT_IMPLEMENTATION);
已存档-自第4305版起已修复
晨思(完全可以忽略:-) 技术原因是不正确的构造函数链接:插入默认值应由do-it-all构造函数处理(或者它应该抛出一个NPE) 根本原因是转换器所有权的微妙变化:其通常所有者是处理自动完成的自定义文档,该文档保护自己不受空值的影响。对于JList变体,它是不习惯这种负担的ListAdapter。。。这种转变并不是不正确的(事实上,确切的方式是这样的),只是引入了一种非常轻微的不一致,很容易被忽视
AutoCompleteDecorator.decorate(dataList, test, false)
只需添加错误的设置
还是像这样
boolean strictMatching = false;
AutoCompleteDecorator.decorate(UName,items,strictMatching);
我已经读过了,但它的答案并不能解决我目前面临的问题。。可能是一个bug,可以用你的例子和SaveLabeDeMo来复制它。你可以考虑在SWIXX问题跟踪器中报告它,这样我们就不会忘记去查看它(把它踢到最优先的位置去踢它):-我想我会坐上一天左右。以防有人看到我设法打破的微妙之处。谢谢你提出这个问题:-)
boolean strictMatching = false;
AutoCompleteDecorator.decorate(UName,items,strictMatching);