How does the Vaadin table work with Navigator? - vaadin

Question

I'm writing a view which navigates to a table entry's page displayed on the left side when a table entry (on the right) is chosen. This is similar to the addressbook tutorial on Vaadin's site, only I make use of the Navigator and views.
While I got the navigation to work (clicking on entry with id #12 navigates to localhost:8080/test/12) and a test label in the view's enter() gets changed to match the id, testTable.getItem(event.getParameters()) returns null for some reason so I can't access the entry.
The ValueChangeListener and enter() for the view are shown below.
class ValueChangeListener implements Property.ValueChangeListener {
Object testId;
#Override
public void valueChange(ValueChangeEvent event) {
// Navigate to a chosen table entry
this.testId = event.getProperty().getValue();
navigator.navigateTo("test/" + testId);
}
}
...
public void enter(ViewChangeEvent event) {
Object tmp = event.getParameters();
testName.setValue((String) tmp); // is set to the id
System.out.println(testTable.getItem(tmp) == null); // DEBUG: always returns true
}

Answer 1

I think you should change this:
System.out.println(testTable.getItem(tmp) == null);
to this:
String str = (String) tmp;
if (str != null && !str.isEmpty()) {
System.out.println(testTable.getItem(Integer.parseInt(str)) == null);
}

Answer 2

I think there's something wrong in how you manage you Navigator.
Firstly when you change view with Navigator you who should add a proper "URL fragment" with "#".
For example the Vaadin sampler uses:
http://demo.vaadin.com/sampler/#foundation
If in your URL there's no "#" ViewChangeEvent.getParameters() gives you null or isEmpty().