QTreeWidget, i cant see the items

[clepto]

I add items to a treewidget but i cannot see them
i am usings qtjambi, here is the code, the libraryTree is the QTreeWidget

QTreeWidgetItem allItem = new QTreeWidgetItem(libraryTree);
allItem.setText(1, "All");
libraryTree.addTopLevelItem(allItem);

[clepto]

using this i release that it never get past the second line until i close the window

System.out.println("Add item");
QTreeWidgetItem allItem = new QTreeWidgetItem(libraryTree);
System.out.println("1");
allItem.setText(1, "All");
System.out.println("2");
libraryTree.addTopLevelItem(allItem);
System.out.println("The item has been added");

output:

Add item
QObject::startTimer: QTimer can only be used with threads started with QThread
QObject::startTimer: QTimer can only be used with threads started with QThread
1
2
The item has been added
what thread and timer has to do with that?