Hello I'm Yuri.
I was trying to make use of a ListView instance to get checkboxes for strings
that I have stored in a database
But I get this error when trying to access the page containing the ListView
instance.
WicketMessage: CheckGroup [4:searchform:sectorCheckGroup] contains a null model
object, must be an object of type java.util.Collection
Root cause:
wicket.WicketRuntimeException: CheckGroup [4:searchform:sectorCheckGroup]
contains a null model object, must be an object of type java.util.Collection
My HTML page which consist of the ListView code is as follows:
<span wicket:id="sectorCheckGroup">
<label>select one or more numbers (CheckGroup)
<span wicket:id="sectors">
<input type="checkbox" wicket:id="check"/>
<span wicket:id="naam">[this is where number will be]</span>
</span>
</label>
</span>
My Model class have the following getter method:
public List getSectorCheckGroup()
{
return sectorCheckGroup;
}
sectorCheckGroup is a List type
My Page/Java class have the following code that refers to the ListView:
List se = Arrays.asList(new String[] {"Primair", "Special", "Superb special"});
sectors = new CheckGroup("sectorCheckGroup");
add(sectors);
sectorList = new ListView("sectors", se)
{
protected void populateItem(ListItem item)
{
item.add(new Check("check", item.getModel()));
item.add(new Label("name", item.getModelObjectAsString()));
};
};
sectors.add(sectorList);
My Code is pretty much the same as the one in the wicket-examples(the Forminput
example which uses ListView)
What is it that I'm doing wrong then?
Anyone?
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