Describe the bug
UI of the Java application doesn’t show up when -XstartOnFirstThread is enabled (This option is enabled by default for SWT)
To Reproduce
Run the below snippet with :
Use the -XstartOnFirstThread arguement when launching with swtoption enabled (This is enabled by default); The UI doesn't show up; When the option is disabled, the UI shows up
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
public class HtmlHeaderLafScrollTest {
private static JFrame frame;
private static JTable table;
public static void main(String[] args) {
SwingUtilities.invokeLater(HtmlHeaderLafScrollTest::createAndShowGUI);
}
private static void createAndShowGUI() {
frame = new JFrame("Swing HTML Header + Scrollbars + L&F Switcher");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(1000, 400);
frame.setLocationRelativeTo(null);
// Top panel with Look and Feel selector
JPanel topPanel = new JPanel();
JComboBox<String> lafSelector = new JComboBox<>(new String[] {
"System (Aqua on macOS)",
"Nimbus",
"Metal"
});
JButton applyButton = new JButton("Apply Look & Feel");
applyButton.addActionListener((ActionEvent e) -> {
String selected = (String) lafSelector.getSelectedItem();
try {
switch (selected) {
case "Nimbus":
UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
break;
case "Metal":
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
break;
default:
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
break;
}
SwingUtilities.updateComponentTreeUI(frame);
} catch (Exception ex) {
ex.printStackTrace();
JOptionPane.showMessageDialog(frame, "Failed to apply Look and Feel.");
}
});
topPanel.add(new JLabel("Select Look & Feel:"));
topPanel.add(lafSelector);
topPanel.add(applyButton);
// Column headers using HTML
String[] columnNames = {
"<html>ID</html>",
"<html>Name<br>(First Last)</html>",
"<html>Age</html>",
"<html>Occupation<br>(Job Title)</html>",
"<html>Department<br>(Short Name)</html>",
"<html>Country</html>",
"<html>Hire Date<br>(YYYY-MM-DD)</html>"
};
// Create data with 50 rows
Object[][] data = new Object[50][columnNames.length];
for (int i = 0; i < 50; i++) {
data[i][0] = i + 1;
data[i][1] = "Employee " + (i + 1);
data[i][2] = 25 + (i % 10);
data[i][3] = "Job Title " + (i % 5);
data[i][4] = "Dept " + (i % 3);
data[i][5] = "Country " + (i % 4);
data[i][6] = "2021-01-" + String.format("%02d", (i % 28 + 1));
}
DefaultTableModel model = new DefaultTableModel(data, columnNames);
table = new JTable(model);
// Enable horizontal scrollbars by forcing wider column widths
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
for (int i = 0; i < table.getColumnCount(); i++) {
table.getColumnModel().getColumn(i).setPreferredWidth(150);
}
JScrollPane scrollPane = new JScrollPane(table,
JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
frame.setLayout(new BorderLayout());
frame.add(topPanel, BorderLayout.NORTH);
frame.add(scrollPane, BorderLayout.CENTER);
frame.setVisible(true);
}
}
Expected behavior
The UI should show up even when the default enabled option Use the -XstartOnFirstThread arguement when launching with swt is present.
Environment:
- Select the platform(s) on which the behavior is seen:
-
Additional OS info (e.g. OS version, Linux Desktop, etc)
-
JRE/JDK version
Workaround (or) Additional context
No
Describe the bug
UI of the Java application doesn’t show up when
-XstartOnFirstThreadis enabled (This option is enabled by default for SWT)To Reproduce
Run the below snippet with :
Use the -XstartOnFirstThread arguement when launching with swtoption enabled (This is enabled by default); The UI doesn't show up; When the option is disabled, the UI shows upExpected behavior
The UI should show up even when the default enabled option
Use the -XstartOnFirstThread arguement when launching with swtis present.Environment:
Additional OS info (e.g. OS version, Linux Desktop, etc)
JRE/JDK version
Workaround (or) Additional context
No