X2Go Bug report logs -
#1621
X11 error with Java 17
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Bug#1621
; Package x2goserver
.
(Sat, 13 Jan 2024 18:25:02 GMT) (full text, mbox, link).
Acknowledgement sent
to Avner Tenne <atenne@gmail.com>
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New Bug report received and forwarded. Copy sent to X2Go Developers <x2go-dev@lists.x2go.org>
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(Sat, 13 Jan 2024 18:25:02 GMT) (full text, mbox, link).
Message #5 received at submit@bugs.x2go.org (full text, mbox, reply):
[Message part 1 (text/plain, inline)]
Package: x2goserver
Version: 4.1.0.3-9
I'm running x2go server on Centos 7.5 using KDE desktop manager.
I use the latest client version 4.1.2.2 from windows.
I'm running the following Java code using the Java 17 version.
public class TestDialog extends JDialog {
private static final long serialVersionUID = 1L;
private final JPanel contentPanel = new JPanel();
/**
* Launch the application.
*/
public static void main(String[] args) {
try {
TestDialog dialog = new TestDialog();
dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Create the dialog.
*/
public TestDialog() {
super();
setPreferredSize(getPreferredSize());
setBounds(100, 100, 450, 300);
getContentPane().setLayout(new BorderLayout());
contentPanel.setLayout(new FlowLayout());
contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
getContentPane().add(contentPanel, BorderLayout.CENTER);
{
JLabel lblNewLabel = new JLabel("New label");
contentPanel.add(lblNewLabel);
}
{
JButton btnNewButton = new JButton("New button");
contentPanel.add(btnNewButton);
}
{
JPanel buttonPane = new JPanel();
buttonPane.setLayout(new FlowLayout(FlowLayout.RIGHT));
getContentPane().add(buttonPane, BorderLayout.SOUTH);
{
JButton okButton = new JButton("OK");
okButton.setActionCommand("OK");
buttonPane.add(okButton);
getRootPane().setDefaultButton(okButton);
}
{
JButton cancelButton = new JButton("Cancel");
cancelButton.setActionCommand("Cancel");
buttonPane.add(cancelButton);
}
}
}
}
When I use the x2go session type KDE I don't get any errors running my code.
But, when I use application session type using terminal mode I get the
following exception:
java.lang.NullPointerException: Cannot invoke
"sun.awt.X11.XBaseWindow.isVisible()" because "parent" is null
at java.desktop/sun.awt.X11.XWindowPeer.setToplevelTransientFor(XWindowPeer.java:1688)
at java.desktop/sun.awt.X11.XWindowPeer.postInit(XWindowPeer.java:253)
at java.desktop/sun.awt.X11.XDecoratedPeer.postInit(XDecoratedPeer.java:105)
at java.desktop/sun.awt.X11.XBaseWindow.init(XBaseWindow.java:184)
at java.desktop/sun.awt.X11.XBaseWindow.<init>(XBaseWindow.java:259)
at java.desktop/sun.awt.X11.XWindow.<init>(XWindow.java:147)
at java.desktop/sun.awt.X11.XComponentPeer.<init>(XComponentPeer.java:111)
at java.desktop/sun.awt.X11.XCanvasPeer.<init>(XCanvasPeer.java:42)
at java.desktop/sun.awt.X11.XPanelPeer.<init>(XPanelPeer.java:48)
at java.desktop/sun.awt.X11.XWindowPeer.<init>(XWindowPeer.java:134)
at java.desktop/sun.awt.X11.XDecoratedPeer.<init>(XDecoratedPeer.java:62)
at java.desktop/sun.awt.X11.XDialogPeer.<init>(XDialogPeer.java:40)
at java.desktop/sun.awt.X11.XToolkit.createDialog(XToolkit.java:1084)
at java.desktop/java.awt.Dialog.addNotify(Dialog.java:768)
at java.desktop/java.awt.Dialog.conditionalShow(Dialog.java:917)
at java.desktop/java.awt.Dialog.show(Dialog.java:1048)
at java.desktop/java.awt.Component.show(Component.java:1728)
at java.desktop/java.awt.Component.setVisible(Component.java:1675)
at java.desktop/java.awt.Window.setVisible(Window.java:1036)
at java.desktop/java.awt.Dialog.setVisible(Dialog.java:1016)
at TestDialog.main(TestDialog.java:22)
Is there any external X2go/desktop session that is missing in order my
code will work fine.
Avner
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