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Home / Interview Subjects / Apache Wicket
WithoutBook LIVE Mock Interviews Apache Wicket Related interview subjects: 39

Interview Questions and Answers

Know the top Apache Wicket interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Total 26 questions Interview Questions and Answers

The Best LIVE Mock Interview - You should go through before interview

Know the top Apache Wicket interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Experienced / Expert level questions & answers

Ques 1

How to create Select Option as menu wise in apache-wicket?

//Java 
import org.apache.wicket.extensions.markup.html.form.select.Select;
import org.apache.wicket.extensions.markup.html.form.select.SelectOption;
...
        //variable to hold the selected value from dropdown box,
        //and also make "jQuery" selected by default
        private String selected = "jQuery";
 
Select languages = new Select("languages", new PropertyModel<String>(this, "selected"));
form.add(languages);
languages.add(new SelectOption<String>("framework1", new Model<String>("Wicket")));
languages.add(new SelectOption<String>("framework2", new Model<String>("Spring MVC")));
languages.add(new SelectOption<String>("framework3", new Model<String>("JSF 2.0")));
languages.add(new SelectOption<String>("Script1", new Model<String>("jQuery")));
languages.add(new SelectOption<String>("Script2", new Model<String>("prototype")));
 
//HTML for dropdown box
<select wicket:id="languages">
<optgroup label="Frameworks">
<option wicket:id="framework1" >Wicket (1.4.7)</option>
<option wicket:id="framework2" >Spring MVC (3.0)</option>
<option wicket:id="framework3" >JSF (2.0)</option>
</optgroup>
<optgroup label="JavaScript">
<option wicket:id="Script1" >jQuery (1.6.1)</option>
<option wicket:id="Script2" >prototype (1.7)</option>
</optgroup>
</select>
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Ques 2

What is Pallet component in apache-wicket?

Wicket extension comes with a special “Palette” component, which render two select boxes, and allow user to move items from one select box into another.

//Java
import org.apache.wicket.extensions.markup.html.form.palette.Palette;
 
final Palette<Hosting> palette = new Palette<Hosting>("palette",
new ListModel<Hosting>(selected),
new CollectionModel<Hosting>(listHosting),
renderer, 10, true);
 
 
//HTML
<span wicket:id="palette"></span>
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Ques 3

How to create custom validator in apache-wicket?

See summary steps to create a custom validator :

1. Implements IValidator.

import org.apache.wicket.validation.IValidator;
 
public class StrongPasswordValidator implements IValidator<String>{
...
}

2. Override validate(IValidatable validatable).

public class StrongPasswordValidator implements IValidator<String>{
...
@Override
public void validate(IValidatable<String> validatable) {
 
//get input from attached component
final String field = validatable.getValue();
 
}
}

3. Attached custom validator to form component.

public class CustomValidatorPage extends WebPage {
 
public CustomValidatorPage(final PageParameters parameters) {
 
     final PasswordTextField password = new PasswordTextField("password",Model.of(""));
//attached custom validator to password field
password.add(new StrongPasswordValidator());
 
//...
}
 
}
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Ques 4

How to integrate apache-wicket with Spring?

Override Wicket application init() method with this “addComponentInstantiationListener(new SpringComponentInjector(this));“.

File : Wicket application class

package com.withoutbook;
 
import org.apache.wicket.protocol.http.WebApplication;
import org.apache.wicket.spring.injection.annot.SpringComponentInjector;
import com.withoutbook.user.SimplePage;
 
public class WicketApplication extends WebApplication {
 
@Override
public Class<SimplePage> getHomePage() {
 
return SimplePage.class; // return default page
}
 
@Override
protected void init() {
 
super.init();
addComponentInstantiationListener(new SpringComponentInjector(this));
 
}
 
}
Now, you can inject Spring bean into Wicket component via @SpringBean.
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Ques 5

How to get ServletContext in apache-wicket application?

Yes, you can get the ServletContext class via Wicket’s WebApplication class like this :

import javax.servlet.ServletContext;
import org.apache.wicket.Page;
import org.apache.wicket.protocol.http.WebApplication;
import com.withoutbook.hello.Hello;
 
public class CustomApplication extends WebApplication {
 
@Override
public Class<? extends Page> getHomePage() {
 
ServletContext servletContext = WebApplication.get().getServletContext();
return Hello.class; //return default page
 
}
 
}
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Ques 6

How to keep file validation in apache-wicket if no file has been selected?

To fix it, just override the validateOnNullValue() method like this :

FileUploadField fileUpload = new FileUploadField("fileupload",new Model<FileUpload>());
 
fileUpload .add(new AbstractValidator() { 
 
       public boolean validateOnNullValue(){
       return true;
}
 
protected void onValidate(IValidatable validatable) { 
FileUpload fileUpload = (FileUpload) validatable.getValue();
}
 
    protected String resourceKey() {
   return "yourErrorKey";
}
 
});
Now, when no file is selected, and submit button is clicked, validation will be performed.
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Ques 7

How to create 404 error page?

<filter-mapping>
<filter-name>wicket.wicketTest</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
<dispatcher>ERROR</dispatcher>
</filter-mapping>
<error-page>
<error-code>404</error-code>
<location>/error404</location>
</error-page>
public class WicketApplication extends WebApplication {
 
@Override
protected void init() {
 
mount(new QueryStringUrlCodingStrategy("error404",ErrorPage404.class));
 
}
 
}
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