Java：如何防止MetalFileChooserUI$INDIDIcon.getIconWidth中的NPE？
在Windows系统上得到了以下NPE FileChooser。http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6342301
Exception in thread "AWT-EventQueue-2" java.lang.NullPointerException at javax.swing.plaf.metal.MetalFileChooserUI$IndentIcon.getIconWidth(Unknown Source) at javax.swing.SwingUtilities.layoutCompoundLabelImpl(Unknown Source) at javax.swing.SwingUtilities.layoutCompoundLabel(Unknown Source) at javax.swing.plaf.basic.BasicLabelUI.layoutCL(Unknown Source) at javax.swing.plaf.basic.BasicLabelUI.getPreferredSize(Unknown Source) at javax.swing.JComponent.getPreferredSize(Unknown Source) at javax.swing.plaf.basic.BasicListUI.updateLayoutState(Unknown Source) at javax.swing.plaf.basic.BasicListUI.maybeUpdateLayoutState(Unknown Source) at javax.swing.plaf.basic.BasicListUI$Handler.valueChanged(Unknown Source) at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source) at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source) at javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source) at javax.swing.DefaultListSelectionModel.changeSelection(Unknown Source) at javax.swing.DefaultListSelectionModel.changeSelection(Unknown Source) at javax.swing.DefaultListSelectionModel.setSelectionInterval(Unknown Source) at javax.swing.JList.setSelectedIndex(Unknown Source) at javax.swing.plaf.basic.BasicComboPopup.setListSelection(Unknown Source) at javax.swing.plaf.basic.BasicComboPopup.access$300(Unknown Source) at javax.swing.plaf.basic.BasicComboPopup$Handler.itemStateChanged(Unknown Source) at javax.swing.JComboBox.fireItemStateChanged(Unknown Source) at javax.swing.JComboBox.selectedItemChanged(Unknown Source) at javax.swing.JComboBox.contentsChanged(Unknown Source)
回答 2
Stack Overflow用户
发布于 2018-09-28 10:52:49
看起来解决方法说明您应该在操作过滤器之前尝试设置UI。这不起作用吗？
如果这不起作用，是否可以在设置UI的同一点创建操纵的FileFilters实例？
Stack Overflow用户
发布于 2018-09-28 11:41:52
在链接到的错误报告中，他们还提到了一种解决方法。似乎归结为按特定顺序调用方法。你试过吗？
问题描述：在明确设置UI和删除所有文件过滤器之间，甚至是暂时的，似乎存在无证的不良互动。如果在设置ui之前完成后者，则尝试显示文件对话框将抛出异常，但如果在弄乱过滤器之前设置了ui则不会。也许有可能使代码更强大，或在文档中包含警告？ 以下重现问题的步骤：运行附加程序：它不会炸弹。然后将setUI行移动到构造函数的底部，然后重试：它会。
https://stackoverflow.com/questions/-100000809
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