0

在我的 Vaadin 6 应用程序中，我有时会收到以下错误：

SEVERE: Terminal error:
java.lang.RuntimeException: handleURI for http://AAA.BBB.CCC.DDD:8080/myapp/ uri: '' returns ambigious result.
at com.vaadin.ui.Window.handleURI(Window.java:432)
at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleURI(AbstractCommunicationManager.java:2291)
at com.vaadin.terminal.gwt.server.CommunicationManager.handleURI(CommunicationManager.java:370)
at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.handleURI(AbstractApplicationServlet.java:1099)
at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:535)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

根据Vaadin 的来源，它发生在以下方法中：

public DownloadStream handleURI(URL context, String relativeUri) {

    DownloadStream result = null;
    if (uriHandlerList != null) {
        Object[] handlers;
        synchronized (uriHandlerList) {
            handlers = uriHandlerList.toArray();
        }
        for (int i = 0; i < handlers.length; i++) {
            final DownloadStream ds = ((URIHandler) handlers[i]).handleURI(
                    context, relativeUri);
            if (ds != null) {
                if (result != null) {
                    throw new RuntimeException("handleURI for " + context
                            + " uri: '" + relativeUri
                            + "' returns ambigious result.");
                }
                result = ds;
            }
        }
    }
    return result;
}

我实际上在列生成器中创建了DownloadStream一个（为了在表格中显示图像）：

public class ImageColumnGenerator implements Table.ColumnGenerator {
    private static final Logger LOGGER = LoggerFactory.getLogger(ImageColumnGenerator.class);

    public final static String IMAGE_FIELD = "image";

    public Object generateCell(final Table aTable, final Object aItemId, final Object aColumnId) {
        if (!IMAGE_FIELD.equals(aColumnId)) {
            return null;
        }
        final BeanItem<UserProductImageBean> beanItem = (BeanItem<UserProductImageBean>)
                aTable.getItem(aItemId);

        final StreamResource streamResource = new StreamResource(new StreamResource.StreamSource() {
            public InputStream getStream() {
                return new ByteArrayInputStream(beanItem.getBean().getImageData());
            }
        },
                beanItem.getBean().getFileName(),
                MyApplication.getInstance());

        LOGGER.debug("imageResource: " + streamResource);
        final Embedded embedded = new Embedded("", streamResource);


        return embedded;
    }
}

beanItem.getBean().getImageData()是一个包含图像数据的字节数组 ( byte[])，我从 Web 服务中获得。

MyApplication.getInstance()定义如下：

public class MyApplication extends Application implements ApplicationContext.TransactionListener
{
    private static ThreadLocal<MyApplication> currentApplication =
            new ThreadLocal<MyApplication> ();

    public static MyApplication getInstance()
    {
        return currentApplication.get ();
    }
}

我该怎么做才能解决上述（严重）错误？

4

1 回答 1

0

只要没人回答。我根本不是上面的专家，但是 - 尝试找出这个错误出现在什么样的 url 上，并在将它们提供给 DownloadStream 之前对它们做一些事情

于 2014-10-16T20:40:22.847 回答