StackOverflow2013

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I found a solution myself. Actually two. The first one uses the deprecated method <a href="https://vaadin.com/api/com/vaadin/server/Page.html#open%28com.vaadin.server.Resource,%20java.lang.String,%20boolean%29" rel="noreferrer">Page.open()</a> <pre><code>public class DownloadComponent extends CustomComponent implements ValueChangeListener { private ComboBox cb = new ComboBox(); public DownloadComponent() { cb.addValueChangeListener(this); cb.setNewItemsAllowed(true); cb.setImmediate(true); cb.setNullSelectionAllowed(false); setCompositionRoot(cb); } @Override public void valueChange(ValueChangeEvent event) { String val = (String) event.getProperty().getValue(); FileResource res = new FileResource(new File(val)); Page.getCurrent().open(res, null, false); } } </code></pre> The javadoc <a href="https://vaadin.com/api/com/vaadin/ui/LegacyWindow.html#open%28com.vaadin.server.Resource,%20java.lang.String%29" rel="noreferrer">here</a> mentions some memory and security problems as reason for marking it deprecated <hr> In the second I try to go around this deprecated method by registering the resource in the DownloadComponent. I'd be glad if a vaadin expert comments this solution. <pre><code>public class DownloadComponent extends CustomComponent implements ValueChangeListener { private ComboBox cb = new ComboBox(); private static final String MYKEY = "download"; public DownloadComponent() { cb.addValueChangeListener(this); cb.setNewItemsAllowed(true); cb.setImmediate(true); cb.setNullSelectionAllowed(false); setCompositionRoot(cb); } @Override public void valueChange(ValueChangeEvent event) { String val = (String) event.getProperty().getValue(); FileResource res = new FileResource(new File(val)); setResource(MYKEY, res); ResourceReference rr = ResourceReference.create(res, this, MYKEY); Page.getCurrent().open(rr.getURL(), null); } } </code></pre> Note: I do not really allow the user to open all my files on the server and you should not do that either. It is just for demonstration.
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