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copied!<p>Investigated this. The reason is breakSpots caching. Looks like <code>LabelView</code> stores them and don't recalculate offsets on previos text edit. If I reset them manually the bug does not happen.</p> <p>A workaround (very dirty because of private breakSpots fields) is following</p> <pre><code>import java.awt.Dimension; import java.lang.reflect.Field; import javax.swing.*; import javax.swing.event.*; import javax.swing.text.*; public class BugWrapJava7 { private JFrame frame = new JFrame(); private JTextPane jtp; private StyledDocument doc; public BugWrapJava7() { jtp = new JTextPane(); jtp.setEditorKit(new MyStyledEditorKit()); jtp.setText("\ntype some text in the above empty line and check the wrapping behavior"); doc = jtp.getStyledDocument(); doc.addDocumentListener(new DocumentListener() { public void insertUpdate(DocumentEvent e) { insert(); } public void removeUpdate(DocumentEvent e) { insert(); } public void changedUpdate(DocumentEvent e) { insert(); } public void insert() { SwingUtilities.invokeLater(new Runnable() { public void run() { Style defaultStyle = jtp.getStyle(StyleContext.DEFAULT_STYLE); doc.setCharacterAttributes(0, doc.getLength(), defaultStyle, false); } }); } }); JScrollPane scroll = new JScrollPane(jtp); scroll.setPreferredSize(new Dimension(200, 200)); frame.add(scroll); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { BugWrapJava7 bugWrapJava7 = new BugWrapJava7(); } }); } } class MyStyledEditorKit extends StyledEditorKit { private MyFactory factory; public ViewFactory getViewFactory() { if (factory == null) { factory = new MyFactory(); } return factory; } } class MyFactory implements ViewFactory { public View create(Element elem) { String kind = elem.getName(); if (kind != null) { if (kind.equals(AbstractDocument.ContentElementName)) { return new MyLabelView(elem); } else if (kind.equals(AbstractDocument.ParagraphElementName)) { return new ParagraphView(elem); } else if (kind.equals(AbstractDocument.SectionElementName)) { return new BoxView(elem, View.Y_AXIS); } else if (kind.equals(StyleConstants.ComponentElementName)) { return new ComponentView(elem); } else if (kind.equals(StyleConstants.IconElementName)) { return new IconView(elem); } } // default to text display return new LabelView(elem); } } class MyLabelView extends LabelView { public MyLabelView(Element elem) { super(elem); } public View breakView(int axis, int p0, float pos, float len) { if (axis == View.X_AXIS) { resetBreakSpots(); } return super.breakView(axis, p0, pos, len); } private void resetBreakSpots() { try { // HACK the breakSpots private fields Field f=GlyphView.class.getDeclaredField("breakSpots"); f.setAccessible(true); f.set(this, null); } catch (Exception e) { e.printStackTrace(); } } } </code></pre> <p>Less hack without the reflection. Based on usual reset of breakSpots on model change.</p> <pre><code>class MyLabelView extends LabelView { boolean isResetBreakSpots=false; public MyLabelView(Element elem) { super(elem); } public View breakView(int axis, int p0, float pos, float len) { if (axis == View.X_AXIS) { resetBreakSpots(); } return super.breakView(axis, p0, pos, len); } private void resetBreakSpots() { isResetBreakSpots=true; removeUpdate(null, null, null); isResetBreakSpots=false; // try { // Field f=GlyphView.class.getDeclaredField("breakSpots"); // f.setAccessible(true); // f.set(this, null); // } catch (Exception e) { // e.printStackTrace(); // } } public void removeUpdate(DocumentEvent e, Shape a, ViewFactory f) { super.removeUpdate(e, a, f); } public void preferenceChanged(View child, boolean width, boolean height) { if (!isResetBreakSpots) { super.preferenceChanged(child, width, height); } } } </code></pre> <p>UPDATE: This one fixes TextSamplerDemo as well. I reset all spots for all labels views.</p> <pre><code>class MyStyledEditorKit extends StyledEditorKit { private MyFactory factory; public ViewFactory getViewFactory() { if (factory == null) { factory = new MyFactory(); } return factory; } } class MyFactory implements ViewFactory { public View create(Element elem) { String kind = elem.getName(); if (kind != null) { if (kind.equals(AbstractDocument.ContentElementName)) { return new MyLabelView(elem); } else if (kind.equals(AbstractDocument.ParagraphElementName)) { return new MyParagraphView(elem); } else if (kind.equals(AbstractDocument.SectionElementName)) { return new BoxView(elem, View.Y_AXIS); } else if (kind.equals(StyleConstants.ComponentElementName)) { return new ComponentView(elem); } else if (kind.equals(StyleConstants.IconElementName)) { return new IconView(elem); } } // default to text display return new LabelView(elem); } } class MyParagraphView extends ParagraphView { public MyParagraphView(Element elem) { super(elem); } public void removeUpdate(DocumentEvent e, Shape a, ViewFactory f) { super.removeUpdate(e, a, f); resetBreakSpots(); } public void insertUpdate(DocumentEvent e, Shape a, ViewFactory f) { super.insertUpdate(e, a, f); resetBreakSpots(); } private void resetBreakSpots() { for (int i=0; i<layoutPool.getViewCount(); i++) { View v=layoutPool.getView(i); if (v instanceof MyLabelView) { ((MyLabelView)v).resetBreakSpots(); } } } } class MyLabelView extends LabelView { boolean isResetBreakSpots=false; public MyLabelView(Element elem) { super(elem); } public View breakView(int axis, int p0, float pos, float len) { if (axis == View.X_AXIS) { resetBreakSpots(); } return super.breakView(axis, p0, pos, len); } public void resetBreakSpots() { isResetBreakSpots=true; removeUpdate(null, null, null); isResetBreakSpots=false; } public void removeUpdate(DocumentEvent e, Shape a, ViewFactory f) { super.removeUpdate(e, a, f); } public void preferenceChanged(View child, boolean width, boolean height) { if (!isResetBreakSpots) { super.preferenceChanged(child, width, height); } } } </code></pre>

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