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  1. JDK
  2. JDK-8224475

JTextPane does not show images in HTML rendering

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    • b07
    • x86_64
    • linux

        ADDITIONAL SYSTEM INFORMATION :
        System/OS :
        Debian 9, 4.9.0-8-amd64 #1 SMP Debian 4.9.144-3.1 (2019-02-19) x86_64 GNU/Linux
        Java :
        OpenJDK Runtime Environment (build 1.8.0_212-8u212-b01-1~deb9u1-b01)
        OpenJDK 64-Bit Server VM (build 25.212-b01, mixed mode)

        A DESCRIPTION OF THE PROBLEM :
        In a JTextPane I put HTML with some images. Those images were previously put in the JTextPane images cache using "jTextPane.getDocument().putProperty("imageCache",cache)". It has been working fine for years, and works with Oracle JDK. But since OpenJDK 8 212 (may be on earlier releases too) it seems images get lost. It works randomly at the very beginning displaying some of the images, then if I refresh the component images are nor displayed anymore.

        STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
        Run the below provided code with java version :
        openjdk version "1.8.0_212"
        OpenJDK Runtime Environment (build 1.8.0_212-8u212-b01-1~deb9u1-b01)
        OpenJDK 64-Bit Server VM (build 25.212-b01, mixed mode)

        EXPECTED VERSUS ACTUAL BEHAVIOR :
        EXPECTED -
        Green arrow is displayed on all iterations.
        ACTUAL -
        With java version OpenJDK the green arrow is not displayed after a few iteration.
        With java version Oracle Java(TM) SE Runtime Environment (build 1.8.0_172-b11) the green arrow in displayed on all iterations.

        ---------- BEGIN SOURCE ----------
        import java.awt.BorderLayout;
        import java.awt.Image;
        import java.net.URL;
        import java.util.Dictionary;
        import java.util.Hashtable;
        import javax.swing.ImageIcon;
        import javax.swing.JFrame;
        import javax.swing.JPanel;
        import javax.swing.JTextPane;
        import javax.swing.text.EditorKit;

        public class MainBug implements Runnable {
        private static JFrame frame;
        public static JPanel contentPanel;
        static Dictionary<URL, Image> cache;
        static JTextPane jTextPane;
            static URL urlArrow;

        public static void main(String[] args) {
        try
        {
        urlArrow = new URL("http:\\arrow.png");

        frame = new JFrame();
        frame.setBounds(200, 200, 800, 600);
        frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        frame.getContentPane().setLayout(new BorderLayout(0, 0));
        frame.setTitle("JTextPane HTML Images bug demo");
        jTextPane = new JTextPane();
        frame.getContentPane().add(contentPanel = new JPanel());
        contentPanel.setLayout(new BorderLayout(0, 0));
        contentPanel.add(jTextPane);
        final EditorKit l_kit = jTextPane.getEditorKitForContentType("text/html");
        jTextPane.setEditable(false);
        jTextPane.setEditorKit(l_kit);
        frame.getContentPane().add(jTextPane, BorderLayout.CENTER);
        cache = (Dictionary<URL, Image>)jTextPane.getDocument().getProperty("imageCache");
                    if (cache==null) {
        cache=new Hashtable<URL, Image>();
        jTextPane.getDocument().putProperty("imageCache",cache);
        }
        Image l_greenequalImage = new ImageIcon(MainBug.class.getResource("arrow.png")).getImage().getScaledInstance(24, 24, java.awt.Image.SCALE_SMOOTH);
        cache.put(urlArrow, l_greenequalImage);
        frame.setVisible(true);
        new Thread(new MainBug()).start();
        }
        catch(Exception e)
        {
        System.err.println(e);
        e.printStackTrace();
        }

        }
        public void run() {
        for (int i=0; i < 5; i++)
        {
        jTextPane.setText("<html><body bgcolor=\"#666666\"><center>Iteration " + i + " -> <img src=\"" + urlArrow + "\"> </center></body></html>");
        jTextPane.validate();
        jTextPane.repaint();
        try {
        Thread.currentThread().sleep(2000);
        } catch (InterruptedException e) { System.err.println(e); }
        }
        }
        }

        ---------- END SOURCE ----------

        CUSTOMER SUBMITTED WORKAROUND :
        Use java version:
        java version "1.8.0_172"
        Java(TM) SE Runtime Environment (build 1.8.0_172-b11)
        Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode)


        FREQUENCY : always


          1. arrow.png
            arrow.png
            6 kB
          2. MainBug.java
            3 kB
          3. NOT_OK-iteration0-java-8-openjdk-amd64-1.8.0_212.png
            NOT_OK-iteration0-java-8-openjdk-amd64-1.8.0_212.png
            25 kB
          4. OK-iteration0-OracleJDK1.8.0_201.PNG
            OK-iteration0-OracleJDK1.8.0_201.PNG
            60 kB

              pbansal Pankaj Bansal (Inactive)
              webbuggrp Webbug Group
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                Created:
                Updated:
                Resolved: