This does not produces any warnings
public class TablePage extends WebPage {
/** Support serialization. */
private static final long serialVersionUID = 1L;
/**
* Creates a page containing a table of Contacts.
*/
public TablePage() {
// Initialize our list of Contact instances.
// Use ArrayList, not List, since ArrayList is Serializable.
ArrayList<Contact> contacts = new ArrayList<Contact>();
contacts.add(new Contact("Joe Smith", "123 Honu St., Kailua, HI
96734"));
contacts.add(new Contact("Sally Forth", "456 Alapapa St., Honolulu, HI
96813"));
// Create the dataview to display our list of contact instances.
// Note that the following commented out line is OK from a type
perspective.
// ListDataProvider<Contact> test = new
ListDataProvider<Contact>(contacts);
// But we can't say new ListDataProvider<Contact> in the next line. Why?
DataView<Contact> dataView = new DataView<Contact>("ContactList",
new ListDataProvider<Contact>(contacts)) {
/** For serialization. */
private static final long serialVersionUID = 1L;
/**
* Display each row in the table.
*
* @param item A Contact instance to be displayed.
*/
public void populateItem(Item<Contact> item) {
Contact contact = (Contact) item.getModelObject();
item.add(new Label("Name", contact.getName()));
item.add(new Label("Address", contact.getAddress()));
}
};
// Add the dataview to the TablePage.
add(dataView);
}
/**
* An inner class implementing a record of data to be displayed as a row
in the table. Package
* private so that TestTablePage can access it.
*
* @author Philip Johnson
*/
static class Contact implements Serializable {
/** Support serialization. */
private static final long serialVersionUID = 2L;
private String name;
private String address;
/**
* Create a new contact, given a name and an address.
*
* @param name The name.
* @param address The address.
*/
public Contact(String name, String address) {
this.name = name;
this.address = address;
}
/**
* Return the name.
*
* @return The name of this contact.
*/
public String getName() {
return name;
}
/**
* Return the address of this contact.
*
* @return The address.
*/
public String getAddress() {
return address;
}
}
}
at least on my IDE
Best,
Ernesto
On Sat, Nov 7, 2009 at 9:42 AM, Philip Johnson <john...@hawaii.edu> wrote:
> Greetings, Wicket Wizards,
>
> I am updating a sample Wicket program from 1.3.6 to 1.4.3 and running into
> a few generics-related issues. I am hoping you folks can quickly set me
> straight. My code appears to run successfully and passes its JUnit tests,
> despite the warnings I would like to remove. The purpose of the code is to
> demonstrate simple use of Forms, Lists, and Tables and associated testing of
> these constructs using WicketTester.
>
> First off, although you hopefully will not need to, you can download the
> sample code from here:
> <
> http://ics-wicket-examples.googlecode.com/files/wicket-example02-1.0.1106.zip
> >
>
> Unzip, cd into the directory, and type "ant", It should download Ivy, then
> download Wicket, Jetty, SLF4J, and JUnit, and finally compile the system,
> generating the following generic-related warnings. Let me now show you
> what they are:
>
> Problem 1: please take a look at line 39 of TablePage.java:
> <
> http://code.google.com/p/ics-wicket-examples/source/browse/trunk/example02/src/edu/hawaii/wicket/TablePage.java
> >
>
> The problematic line is:
> new ListDataProvider(contacts)
>
> and obviously requires a generic argument, but neither of the following
> work:
> new ListDataProvider<Contact>(contacts) // my preferred guess
> new ListDataProvider<List<Contact>>(contacts)
>
> The compiler warning is:
> [javac] TablePage.java:39: warning: [unchecked] unchecked call to
> ListDataProvider(java.util.List<T>) as a member of the raw type
> org.apache.wicket.markup.repeater.data.ListDataProvider
> [javac] new ListDataProvider(contacts)) {
> [javac] ^
> [javac] TablePage.java:39: warning: [unchecked] unchecked conversion
> [javac] found : org.apache.wicket.markup.repeater.data.ListDataProvider
> [javac] required:
> org.apache.wicket.markup.repeater.data.IDataProvider<java.util.List<edu.hawaii.wicket.TablePage.Contact>>
> [javac] new ListDataProvider(contacts)) {
> [javac] ^
>
> Problem 2: on line 49 of the same file, TablePage.java:
> <
> http://code.google.com/p/ics-wicket-examples/source/browse/trunk/example02/src/edu/hawaii/wicket/TablePage.java
> >
>
> The line is:
> Contact contact = (Contact) item.getModelObject();
>
> Since the preceding line provides a parameterized declaration of item
> (Item<List<Contact>> item), I don't understand why I need to cast here. But
> the code does not compile if I don't. Then, I get the following warning:
>
> [javac] TablePage.java:49: warning: [unchecked] unchecked cast
> [javac] found : java.util.List<edu.hawaii.wicket.TablePage.Contact>
> [javac] required: edu.hawaii.wicket.TablePage.Contact
> [javac] Contact contact = (Contact) item.getModelObject();
> [javac]
> ^
>
> Problem 3: WicketTester and generics.
>
> I clearly don't understand how to test with WicketTester. Take a look at
> lines 37-39 of TestListPage:
> <
> http://code.google.com/p/ics-wicket-examples/source/browse/trunk/example02/src/edu/hawaii/wicket/TestListPage.java
> >
>
> This is a mess, and generates the following warning:
> [javac] TestListPage.java:39: warning: [unchecked] unchecked cast
> [javac] found : capture#294 of ?
> [javac] required: java.util.List<java.lang.String>
> [javac] List<String> metaVars = (List<String>) varsModel.getObject();
>
> I have a feeling that my whole approach to getting values out of the table
> for testing is wrong, but I don't know what the correct approach is.
>
> If any of you can give me a hand, the first Mai Tai is on me the next time
> you are in Hawaii.
>
> Thanks!
> Philip
>
>
>
>
>
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