ElementListSelectionDialog未显示元素列表

Question

此问题类似于ElementListSelectionDialog has no elements，但建议的解决方案无效。我已按照vogella教程从http://www.vogella.com/tutorials/EclipseDialogs/article.html创建ElementListSelectionDialog，出现了对话框，但列表中未显示任何内容。我的代码是

@Execute
    public void execute(Shell shell) {
        ElementListSelectionDialog elementListSelectionDialog = new ElementListSelectionDialog(shell, new LabelProvider());
        elementListSelectionDialog.setMultipleSelection(true);
        elementListSelectionDialog.setIgnoreCase(true);
        elementListSelectionDialog.setAllowDuplicates(true);
        elementListSelectionDialog.setMessage("Select the CUSIP to Fix");
        elementListSelectionDialog.setTitle("Incorrect Yield Fixer");
        String[] elements = {"Ashish","Tyagi"};
        logger.debug("calling setElements {}",Arrays.toString(elements));
        elementListSelectionDialog.setElements(elements);
        if(elementListSelectionDialog.open() == SWT.OK) {
            String[] controlLocation = (String[]) elementListSelectionDialog.getResult();
            logger.info("controlLocation is {}",Arrays.toString(controlLocation));
        }
    }

如果有人有任何建议，请告诉我。

输出为：