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我创建了一个示例 GWT 应用程序,其中同步方法返回一个列表。代码编译,我能够成功运行它。但它会在服务器端代码的客户端实现上打印“onFailure”方法中的消息。List 可以作为 GWT 中同步方法的返回类型给出吗?