http://AAA.BBB.CCC.DDD:8080/myapp/的 handleURI: '' 返回模糊结果 (Vaadin 6) [英] handleURI for http://AAA.BBB.CCC.DDD:8080/myapp/ uri: '' returns ambigious result (Vaadin 6)

问题描述

在我的 Vaadin 6 应用程序中，我有时会收到以下错误:

In my Vaadin 6 application I sometimes get the following error:

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 来源 它发生在以下方法中:

Accrording to Vaadin source it occurs in the following method:

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一个 DownloadStream(为了在表格中显示图像):

I actually create a DownloadStream in a column generator (in order to display images in a table):

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() 是一个字节数组 (byte[])，其中包含我从 Web 服务中获取的图像数据.

beanItem.getBean().getImageData() is a byte array (byte[]) with image data, which I get from a web service.

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 ();
    }
}

我该怎么做才能修复上述(严重)错误?

What can I do in order to fix the aforementioned (severe) error?

推荐答案

只要没人回答.我根本不知道上面到底是什么鬼，但是 - 尝试找出出现此错误的 URL 类型，并在将它们提供给 DownloadStream 之前对其进行处理

As soon as nobody answer. I'm not at all expert in what hell it is above, but - try to find out on what kind of urls this error arise on, and do with them something before feed them to DownloadStream

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