Hi Jens
Thanx for your answer.
Below I have attached the stack trace.
Furthermore, I was wrong in my assumption, that the ListEntry class caused
the problem - it is actually another class, that causes the problem.
Another class, still deriving from the DataEntry class - the DualListEntry
class.
java.lang.AssertionError: This UIObject's element is not set; you may be
missing a call to either Composite.initWidget() or UIObject.setElement() at
com.google.gwt.user.client.ui.UIObject.getElement(UIObject.java:556) at
com.google.gwt.user.client.ui.ComplexPanel.add(ComplexPanel.java:94) at
com.google.gwt.user.client.ui.FlowPanel.add(FlowPanel.java:44) at
dk.dbc.dataio.gui.client.components.DataEntry.<init>(DataEntry.java:28) at
dk.dbc.dataio.gui.client.components.DualListEntry.<init>(DualListEntry.java:15)
at
dk.dbc.dataio.gui.client.views.FlowCreateViewImpl.<init>(FlowCreateViewImpl.java:48)
at
dk.dbc.dataio.gui.util.ClientFactoryImpl.<init>(ClientFactoryImpl.java:22) at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525) at
com.google.gwt.dev.shell.ModuleSpace.rebindAndCreate(ModuleSpace.java:475) at
com.google.gwt.dev.shell.GWTBridgeImpl.create(GWTBridgeImpl.java:49) at
com.google.gwt.core.shared.GWT.create(GWT.java:57) at
com.google.gwt.core.client.GWT.create(GWT.java:85) at
dk.dbc.dataio.gui.client.MainEntryPoint.<init>(MainEntryPoint.java:18) at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525) at
com.google.gwt.dev.shell.ModuleSpace.rebindAndCreate(ModuleSpace.java:475) at
com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:385) at
com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:200)
at
com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:526)
at
com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
at java.lang.Thread.run(Thread.java:722)
The DualListEntry class is not (as the ListBox, TextBox etc. that I also
use to construct ListBoxEntry, TextBoxEntry etc.) a standard GWT widget,
but my own widget. It looks something like this:
public class DualList extends FocusWidget {
HorizontalPanel container = new HorizontalPanel();
ListBox right = new ListBox(true);
ListBox left = new ListBox(true);
Button addItem = new Button(">");
Button removeItem = new Button("<");
VerticalPanel buttonPanel = new VerticalPanel();
public DualList() {
container.setStylePrimaryName(dio-DualList);
addItem.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
moveItems(left, right);
}
});
removeItem.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
moveItems(right, left);
}
});
buttonPanel.add(addItem);
buttonPanel.add(removeItem);
container.add(left);
container.add(buttonPanel);
container.add(right);
}
public void addAvailableItem(String value, String key) {
...
}
public void setAvailableItems(Collection<? extends Entry<String,
String>> items) {
...
}
...
}
Originally, the DualList class inherited from Composite rather that
FocusWidget - however, in order to use the DualList together with
DataEntry, I had to extend it from FocusWidget.
And I think, that the problem is related to this somehow...
Br
Steen
Den onsdag den 9. oktober 2013 16.12.46 UTC+2 skrev Steen Lillethorup
Frederiksen:
>
> I am trying to create a generic Composite widget, using Java Generics.
> However I keep getting the assertion error:
>
> java.lang.AssertionError: This UIObject's element is not set; you may be
> missing a call to either Composite.initWidget() or UIObject.setElement()
>
>
> I have defined my Composite widget as follows:
>
> public class DataEntry<DataType extends FocusWidget> extends Composite {
>
> final protected FlowPanel panel;
> final protected InlineLabel promptLabel;
> final protected DataType inputElement;
>
> public DataEntry(final DataType inputField, final String guiId, final
> String prompt) {
> super();
>
> promptLabel = new InlineLabel(prompt);
> inputElement = inputField;
>
> panel = new FlowPanel();
> panel.add(promptLabel);
> panel.add(inputField);
> initWidget(panel);
>
> getElement().setId(guiId);
> promptLabel.setStylePrimaryName("dio-DataEntry-Prompt");
> inputElement.setStylePrimaryName("dio-DataEntry-Input");
> }
>
> And I am defining my concrete Composite widgets as follows (could be
> TextBox, TextArea etc.):
>
> public class ListEntry extends DataEntry<ListBox> {
> public ListEntry(String guiId, String prompt) {
> super(new ListBox(), guiId, prompt);
> }
> ...
> }
>
> Can anyone explain to me, what I have missed here?
>
> Thanx
> Steen
>
>
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