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copied!<p>Edited to add full solution</p> <p>You have to add a JScrollPane first. Then, if you don't want the scrollbars to be visible, but you want the text area to autoscroll, set </p> <pre><code>scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER); </code></pre> <p>on the scrollpane. This will hide the scrollbars, but provide you with autoscrolling.</p> <p>Here's how you'd implement auto scrolling with scroll pane, and automatic resize upto a given maximum. </p> <pre><code>import java.awt.BorderLayout; import java.awt.Dimension; import javax.swing.JEditorPane; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.ScrollPaneConstants; import javax.swing.event.CaretEvent; import javax.swing.event.CaretListener; public class SPTest extends JFrame { private static final long serialVersionUID = 1L; private JEditorPane editor; private JScrollPane scrollPane; private JPanel topPanel; private JLabel labelTop; public SPTest() { super("Editor test"); initComponents(); setDefaultCloseOperation(EXIT_ON_CLOSE); setVisible(true); } private void initComponents() { editor = new JEditorPane("text/plain", null); scrollPane = new JScrollPane(editor); topPanel = new JPanel(); labelTop = new JLabel("main contents here"); topPanel.add(labelTop); setSize(600, 400); editor.setMinimumSize(new Dimension(100, 30)); editor.setPreferredSize(new Dimension(100, 60)); scrollPane.setPreferredSize(new Dimension(600, 60)); scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER); scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER); scrollPane.setMinimumSize(new Dimension(100, 30)); final int MAX_HEIGHT_RSZ = 120; editor.addCaretListener(new CaretListener() { public void caretUpdate(CaretEvent e) { int height = Math.min(editor.getPreferredSize().height, MAX_HEIGHT_RSZ); Dimension preferredSize = scrollPane.getPreferredSize(); preferredSize.height = height; scrollPane.setPreferredSize(preferredSize); SPTest.this.validate(); } }); setLayout(new BorderLayout()); add(topPanel, BorderLayout.NORTH); add(scrollPane, BorderLayout.SOUTH); } public static void main(String[] args) { new SPTest(); } } </code></pre> <p>You could resize You can use this JScrollPane instead of the JPanel as the container for the editor.</p>

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