LogicalDoc获取移交缩略图

Question

我正在使用带有cmis客户端的logicalDoc Enterprise 8.3。

我需要获取翻译缩略图。我创建了此函数，但变量表示形式返回null。

如何获取有关Apache化学cmis的缩略图？

public static void getThumbnail() {

        OperationContext context = session.createOperationContext();
        context.setFilterString("*");
        context.setIncludeAllowableActions(true);
        context.setRenditionFilterString("cmis:thumbnail");
        context.setCacheEnabled(true);

        CmisObject object = session.getObject("doc.302", context);
        Document document = (Document) object;

        ContentStream content = document.getContentStream();
        InputStream stream = null;

        List<Rendition> renditions = document.getRenditions();
        System.out.println(renditions);
        if (renditions != null) {
            for (Rendition rendition : renditions) {
                System.out.println(rendition.getTitle() + ": " + rendition.getStreamId());
            }
        }

    }
}