I'm using Wicket 1.2.4 and working with a simple page to show a ListView.
Here is the constructor for the page.
public Results(List resultsList) {
ListView procedures = new ListView("procedures", resultsList) {
protected void populateItem(ListItem item) {
List procedure = (List) item.getModelObject();
item.add(new Label("equipment", (String) procedure.get(0)));
}
};
add(procedures);
}
I call this constructor from the submit button on another page.
searchForm.add(new Button("search"){
protected void onSubmit() {
try {
List results =
lotusService.getLockoutsUsingEquipmentSearch(getSearchCriteria());
if(results.size() >0){
setResponsePage(new Results(results));
}
} catch (LotusServiceException e) {
e.printStackTrace();
}
}
});
The results page is very simple.
<html>
<head>
<title>List of Procedures</title>
</head>
<body>
Hello
<table>
<tr wicket:id="procedures">
<td><span wicket:id="equipment"/></td>
</tr>
</table>
</body>
</html>
What happens is that I get a null pointer exception thrown on ListView
procedures = new ListView("procedures", resultsList). The null pointer
states Method threw 'java.lang.NullPointerException' exception. Cannot
evaluate com.dmflavors.lockout.view.pages.Results$1.toString(). The program
is not stopped by the exception and the Results page is rendered but without
any ListView. The resultsList list referred to in the ListView call is
populated with values, which are actually other lists...so it is a List of
Lists. Any help would be appreciated.
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