Running reports in NextReports Server consists of a number of steps, one of them being selecting parameters. Depending of parameter's type, user can choose the values using a specific UI component like text field, check box, combo box, calendar, selection lists and so on.
Model used for a parameter is something generic like Serializable, because it's type can be anything. One problem appeared at migration from version 1.4 to version 1.5. A simple String TextField with a Serializable model (objectModel in our case):
TextField<String> textField = new TextField<String>("txtValue",When we put a value in our text field, on submit we get : "is not a valid Serializable" error. That shows us Wicket 1.5 does not know that String declaration in our case is a Serializable type. To make models accept a general type , we should now create also the converter used by the component to specify the class type:
new PropertyModel<String>(this, "objectModel"));
TextField<String> textField = new TextField<String>("txtValue",
new PropertyModel<String>(this, "objectModel")) {
@Override
public <C> IConverter<C> getConverter(Class<C> type) {
return new AbstractConverter() {
public Object convertToObject(String value, Locale locale) {
return value;
}
@Override
protected Class getTargetType() {
return String.class;
}
};
}
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