Integrating Wicket with Java EE 6

Wicket + JEE 6
Michael Plöd
Senacor Technologies AG

Agenda

• Brief Wicket Intro
• Standard Wicket - Spring App
• Integrating Wicket and EJB with CDI
• Integrating Wicket and Bean Validation
• Coding Example

Quickstart
mvn archetype:create
-DarchetypeGroupId=org.apache.wicket
-DarchetypeArtifactId=
wicket-archetype-quickstart
-DarchetypeVersion=1.4.13
-DgroupId=com.senacor
-DartifactId=wicket-example

WebApplication.java

wicket
HomePage.java - HomePage.html
example

web.xml

web.xml
conﬁgures
Application

<web-app ... >
<display-name>wicket-example</display-name>

<filter>
<filter-name>wicket.wicket-example</filter-name>
<filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>
<init-param>
<param-name>applicationClassName</param-name>
<param-value>com.senacor.WicketApplication</param-value>
</init-param>
</filter>

<filter-mapping>
<filter-name>wicket.wicket-example</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>

Application
is responsible for
bootstrapping

package com.senacor;

import org.apache.wicket.protocol.http.WebApplication;

public class WicketApplication extends WebApplication
{
public WicketApplication() {}

public Class<HomePage> getHomePage()
{
return HomePage.class;
}
}

public class HomePage extends WebPage {
public HomePage(final PageParameters parameters) {
add(new Label("message",
"If you see this message wicket is
properly configured and running"));
}
}
<html xmlns:wicket=
"http://wicket.apache.org/dtds.data/wicket-xhtml1.4-strict.dtd" >
<head>
<title>Wicket Quickstart Archetype Homepage</title>
</head>
<body>
Wicket Quickstart Archetype Homepage
 
message will be here
</body>
</html>

Spring JEE



Typical Wicket
Wicket - Spring @SpringBean
Application
<Service>
Spring Bean

@Autowired

<Repository>
Spring Bean

@SpringBean
private PersonService personService;

private class PersonListModel
extends LoadableDetachableModel<List<Person>> {
 @Override
 protected List<Person> load() {
 return personService.listPersons();
 }
 }
...
final PropertyListView<Person> list =
new PropertyListView<Person>("persons", new PersonListModel()) {
 ...
 }
 };
...

JSF Typical Java EE 6
@ManagedBean + Application
@EJB / Inject

<Service>
EJB 3.1

@Inject / @EJB

<DAO>
EJB 3.1 / JPA

Wicket
Wicket
+
? Java EE6
<Service>
EJB 3.1

@Inject / @EJB

<DAO>
EJB 3.1 + JPA

Component wiring with CDI
Weld / Seam Wicket Module

META-INF/beans.xml
or
WEB-INF/beans.xml

package com.senacor;

import org.apache.wicket.protocol.http.WebApplication;

public class WicketApplication extends WeldApplication
{
public WicketApplication() {}

public Class<HomePage> getHomePage()
{
return HomePage.class;
}
}

@Inject
private PersonService personService;

private class PersonListModel
extends LoadableDetachableModel<List<Person>> {
 @Override
 protected List<Person> load() {
 return personService.listPersons();
 }
 }
...
final PropertyListView<Person> list =
new PropertyListView<Person>("persons", new PersonListModel()) {
 ...
 }
 };
...

„Programming today is a race
between software engineers striving
to build bigger and better idiot-proof
programs, and the universe trying to
build bigger and better idiots.

So far, the universe is winning.“
-- Robert Cringely --

Model
Validation
with Wicket

Validate Validation
Conversion
mandatory of

Back to input Validation
screen of

onSubmit Update
EventHandler model

form.add(new TextField("firstname").setRequired(true));

form.add(new TextField("email")
.setRequired(true)
.add(EmailAddressValidator.getInstance()));

form.add(new TextField("age")
.add(NumberValidator.minimum(18)));

form.add(new TextField("username")
.add(StringValidator.lengthBetween(6, 10)));

form.add(new TextField("username")
.add(new PatternValidator("[a-zA-Z0-9]*"))
.add(StringValidator.lengthBetween(6, 10)));

No support for
Model
Bean Validation
Validation
in Wicket 1.4
with Wicket

JSR-303 Wicket Validator

from Zenika
http://code.google.com/p/wicket-jsr303-validators/

http://blog.zenika.com/index.php?post/
2010/02/24/Wicket-JSR-303-Validators

public class Person {
@NotNull private String firstname;
@NotNull @EMail private String email;
...
}
form.setModel(new CompoundPropertyModel(new Person()));
form.add(new TextField("firstname"));
form.add(new TextField("email"));
form.add(new TextField("age"));
form.add(new TextField("password"));
form.add(new TextField("username"));
form.add(new JSR303FormValidator());

Live Coding
example
https://github.com/mploed/wicketjee6-example

Further Reading
Wicket In Action
Martijn Dashorst, Eelco Hillenius
Manning

Wicket
Roland Förther, Olaf Siefart, Carl-Eric Menzel
dpunkt Verlag

Thank
You!
Michael Plöd
Senacor Technologies AG

Integrating Wicket with Java EE 6

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