问使用Matlab控件的Java句柄设置“text”属性时出错

EN

我使用Yair的findjobj函数将Java回调添加到我的Matlab中。我的目标是，编辑文本中的每个按键(特别是向上箭头，向下箭头)将编辑文本的字符串更改为不同的东西(增量，减少一个数字)。

问题是Javaobject的文本set-ting触发了一个奇怪的-ting错误。下面是一个极小的(也是荒谬的)例子，它显示了这个问题：

function keypress_callback_test()
hf = figure();
he=uicontrol('Parent',hf,'Style','edit', 'String', '0');

jhe = findjobj(he, 'nomenu');
set(jhe,'KeyPressedCallback', @change_text);

function change_text(hObject, event)
set(hObject, 'text', num2str(rand(1)))

代码可以工作，但是Matlab会显示以下(相当长的)错误消息：

线程"AWT-EventQueue-0“中的异常( javax.swing.text.JTextComponent.getSelectionStart(Unknown源)、javax.swing.text.PlainView.paint(未知源)、javax.swing.text.FieldView.paint(未知源)、javax.swing.plaf.basic.BasicTextUI.paintSafely(Unknown源( javax.swing.plaf.basic.BasicTextUI.paint(Unknown源))中的异常在javax.swing.plaf.basic.BasicTextUI.update(Unknown源)在javax.swing.JComponent.paintComponent(未知源)在javax.swing.JComponent.paint(未知源)在javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown源(在javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown源)在javax.swing.RepaintManager$PaintManager.paint(Unknown源)在javax.swing.RepaintManager.paint(未知源)在javax.swing.JComponent._paintImmediately(Unknown源)(在javax.swing.JComponent.paintImmediately(Unknown源)在javax.swing.RepaintManager.paintDirtyRegions(Unknown源)在javax.swing.RepaintManager.paintDirtyRegions(Unknown源)在javax.swing.RepaintManager.prePaintDirtyRegions(Unknown源)在javax.swing.RepaintManager.access$700(未知源)在javax.swing.RepaintManager$ProcessingRunnable.run(Unknown来源)在java.awt.event.InvocationEvent.dispatch(Unknown源)在java.awt.EventQueue.dispatchEventImpl(未知源)(未知源)在java.awt.EventQueue$3.运行(未知源)在java.awt.EventQueue$3.运行(未知源)在java.security.AccessController.doPrivileged(Native方法)在java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown源)在java.awt.EventQueue.dispatchEvent(未知源)在java.awt.EventDispatchThread.pumpEventsForFilter(Unknown源)在java.awt ).EventDispatchThread.pumpEventsForHierarchy(Unknown源)在java.awt.EventDispatchThread.pumpEvents(Unknown源)在java.awt.EventDispatchThread.pumpEvents(Unknown源)在java.awt.EventDispatchThread.run(未知源)

是什么导致了这个错误，我如何避免它？