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Freshers / Beginner level questions & answers

Ques 1. What is Wicket Framework?

Wicket is one of the most recent in a long line of Java web development frameworks.Wicket is a component-based framework, which puts it in stark contrast to some of the earlier solutions to the sometimes monotonous task of web programming.Wicket builds on top of Sun's servlet API. Wicket is mostly removed from the request/response nature that is inherent with the web and Servlets. Instead of building controllers that must service many users and threads simultaneously, taking in requests, returning responses, and never storing any state, the Wicket developer thinks in terms of stateful components. Instead of creating a controller or action class, he or she creates a page, places components on it, and defines how each component reacts to user input.

It is a lightweight component-based web application framework for the Java programming.

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Ques 2. What are Wicket Models?

A Model holds a value for a component to display and/or edit :

Simple Models
Dynamic Models
Property Models
Compound Property Models
Wrapped Object Models
Resource Models
Detachable Models
Chaining models

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Ques 3. What are the Ways to create a page in wicket?

There are 2 ways to Create New Wicket Page.

1. create a Page Extending "WebPage" Class.

2. create a Page Extending "BasePage" ( BasePage Should Extend "WebPage").

IF you are using first Way you should Create Whole page with thier Header,Footer and other parts

and that HTML file's content may be large (complicated).This is an Unreliable way to create Page. suppose you have to change some content in Header part then you have to edit all pages that having Header Content

If you are using second way, first Create your BasePage then you can extend these page to other while creating new page. in that page you have to add only Body part (Content that you want to show on that Page) Using <wicket:child />

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Ques 4. What is about WebAppication in Wicket?

A web application is a subclass of Application which associates with an instance of WicketServlet to serve pages over the HTTP protocol. This class is intended to be subclassed by framework clients to define a web application.

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Ques 5. What is Base class for HTML pages?

Base class for HTML pages: Webpage Class.

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Ques 6. Dependency to start wicket.

<groupid>org.apache.wicket</groupid>

<artifactid>wicket</artifactid>

</dependency>

Wicket need SLF4J !

You have to include the slf4j logging implementation, otherwise Wicket will be failed to start.

Wicket need resource filter

Remember to add the resource filter, Wicket puts all files in same package folder, if you didn�t define the resource filter to include everything �<include>*</include>� , �html�, �properties� or other resources files may failed to copy to the correct target folder.

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Ques 7. A sample web application using apache wicket.

In Wicket, most stuffs are work by convention, you don�t need to configure it. In this case, WebApplication returns a �Hello.class� as the default page, when Wicket see this �Hello.class�, it know the mark up �html� page should be �Hello.html�, and it should be able to find at the same package directory. This is why Wicket need you to put both �html� and �java� class together.

File : WelcomeApplication.java � The main application entrance.

package com.withoutbook;

import org.apache.wicket.Page;

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

import com.withoutbook.hello.Hello;

public class WelcomeApplication extends WebApplication {

@Override

public Class<? extends Page> getHomePage() {

return Hello.class; //return default page

}

File : Hello.java

package com.withoutbook.hello;

import org.apache.wicket.PageParameters;

import org.apache.wicket.markup.html.basic.Label;

import org.apache.wicket.markup.html.WebPage;

public class Hello extends WebPage {

private static final long serialVersionUID = 1L;

public Hello(final PageParameters parameters) {

add(new Label("message", "Hello World, Wicket"));

}

File : Hello.html

<html>

<head>

<title>Wicket Hello World</title>

</head>

<body>

<h1>

<span wicket:id="message">message will be replace later</span>

</h1>

</body>

</html>

To make Wicket works, you need to register Wicket filters in your web.xml file.

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"

version="2.4">

<display-name>Wicket Web Application</display-name>

<filter-name>wicket.wicketTest</filter-name>

<filter-class>org.apache.wicket.protocol.http.WicketFilter</filter-class>

<init-param>

<param-name>applicationClassName</param-name>

<param-value>com.withoutbook.WelcomeApplication</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>wicket.wicketTest</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

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Ques 8. How to create a TextField in Apache-Wicket?

final TextField<String> username = new TextField<String>("username",

Model.of(""));

username.setRequired(true);

username.add(new UsernameValidator());

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Ques 9. How to submit a form in apache-wicket?

Form<?> form = new Form<Void>("userForm") {

@Override

protected void onSubmit() {

final String usernameValue = username.getModelObject();

PageParameters pageParameters = new PageParameters();

pageParameters.add("username", usernameValue);

setResponsePage(SuccessPage.class, pageParameters);

}

};

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Ques 10. Example of Username validation in apache-wicket.

import org.apache.wicket.validation.CompoundValidator;

import org.apache.wicket.validation.validator.PatternValidator;

import org.apache.wicket.validation.validator.StringValidator;

public class UsernameValidator extends CompoundValidator<String> {

private static final long serialVersionUID = 1L;

public UsernameValidator() {

add(StringValidator.lengthBetween(6, 15));

add(new PatternValidator("[a-z0-9_-]+"));

}

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Ques 11. How to create a password field in apache-wicket?

//create a password field

final PasswordTextField password = new PasswordTextField("password", Model.of(""));

//for properties file

password.setLabel(Model.of("Password"));

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Ques 12. How to create a TextArea in apache-wicket?

//create a textarea field for address

final TextArea<String> address = new TextArea<String>("address",Model.of(""));

address.setRequired(true);

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Ques 13. How to create checkbox in apache-wicket?

final CheckBox chk0 = new CheckBox("checkbox0", Model.of(Boolean.TRUE));

final CheckBox chk1 = new CheckBox("checkbox1",

new PropertyModel<Boolean>(this, "checkbox1"));

final CheckBox chk2 = new CheckBox("checkbox2",

new PropertyModel<Boolean>(this, "checkbox2"));

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Ques 14. How to create multiple checkboxes in apache-wicket?

private static final List<String> LANGUAGES = Arrays.asList(new String[] {"Java", ".NET", "PHP", "Python", "C/C++" });

// hold the checkbox values

private ArrayList<String> languagesSelect = new ArrayList<String>();

final CheckBoxMultipleChoice<String> listLanguages = new CheckBoxMultipleChoice<String>("languages", new Model(languagesSelect), LANGUAGES);

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Ques 15. How to create Radio button in apache-wicket?

//choices in radio button

private static final List<String> TYPES = Arrays.asList(new String[] { "Shared Host", "VPN", "Dedicated Server" });

RadioChoice<String> hostingType = new RadioChoice<String>("hosting", new PropertyModel<String>(this, "selected"), TYPES);

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Ques 16. How to create single selected ListBox?

// single list choice

private static final List<String> FRUITS = Arrays.asList(new String[] { "Apple", "Orange", "Banana" });

ListChoice<String> listFruits = new ListChoice<String>("fruit", new PropertyModel<String>(this, "selectedFruit"), FRUITS);

listFruits.setMaxRows(5);

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Ques 17. How to create multiple selected ListBox in apache-wicket?

//choices in list box

private static final List<String> NUMBERS = Arrays.asList(new String[] {"Number 1", "Number 2", "Number 3", "Number 4", "Number 5", "Number 6" });

//variable to hold the selected multiple values from listbox,

//and make "Number 6" selected as default value

private ArrayList<String> selectedNumber = new ArrayList<String>(

Arrays.asList(new String[] { "Number 6" }));

ListMultipleChoice<String> listNumbers = new ListMultipleChoice<String>(

"number", new Model(selectedNumber), NUMBERS);

//HTML for multiple select listbox

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Ques 18. How to create DropDown Choice in apache-wicket?

//Java

import org.apache.wicket.markup.html.form.DropDownChoice;

...

//choices in dropdown box

private static final List<String> SEARCH_ENGINES = Arrays.asList(new String[] {

"Google", "Bing", "Baidu" });

//variable to hold the selected value from dropdown box,

//and also make "Google" is selected by default

private String selected = "Google";

DropDownChoice<String> listSites = new DropDownChoice<String>(

"sites", new PropertyModel<String>(this, "selected"), SEARCH_ENGINES);

//HTML for dropdown box

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Ques 19. How to create FileUpload field in apache-wicket?

//Java

import org.apache.wicket.markup.html.form.upload.FileUploadField;

form.setMultiPart(true);

form.add(fileUpload = new FileUploadField("fileUpload"));

//HTML

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Experienced / Expert level questions & answers

Ques 20. 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

<option wicket:id="framework1" >Wicket (1.4.7)</option>

<option wicket:id="framework2" >Spring MVC (3.0)</option>

</optgroup>

<option wicket:id="Script1" >jQuery (1.6.1)</option>

<option wicket:id="Script2" >prototype (1.7)</option>

</optgroup>

</select>

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Ques 21. 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

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Ques 22. 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 23. 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 24. 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 25. 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 26. 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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JAXB interviewfragen und antworten - Total 18 questions
JSP interviewfragen und antworten - Total 49 questions
Java Concurrency interviewfragen und antworten - Total 30 questions
J2EE interviewfragen und antworten - Total 25 questions
JUnit interviewfragen und antworten - Total 24 questions
Java OOPs interviewfragen und antworten - Total 30 questions
Apache Tapestry interviewfragen und antworten - Total 9 questions
Java 11 interviewfragen und antworten - Total 24 questions
JDBC interviewfragen und antworten - Total 27 questions
Java Garbage Collection interviewfragen und antworten - Total 30 questions
Spring Framework interviewfragen und antworten - Total 53 questions
Java Swing interviewfragen und antworten - Total 27 questions
Java Design Patterns interviewfragen und antworten - Total 15 questions
JPA interviewfragen und antworten - Total 41 questions
Hibernate interviewfragen und antworten - Total 52 questions
JMS interviewfragen und antworten - Total 64 questions
JSF interviewfragen und antworten - Total 24 questions
Java 8 interviewfragen und antworten - Total 30 questions
Tally interviewfragen und antworten - Total 30 questions
Pega interviewfragen und antworten - Total 30 questions
ITIL interviewfragen und antworten - Total 25 questions
Finance interviewfragen und antworten - Total 30 questions
SAP MM interviewfragen und antworten - Total 30 questions
JIRA interviewfragen und antworten - Total 30 questions
SAP ABAP interviewfragen und antworten - Total 24 questions
SCCM interviewfragen und antworten - Total 30 questions
Xamarin interviewfragen und antworten - Total 31 questions
iOS interviewfragen und antworten - Total 52 questions
Ionic interviewfragen und antworten - Total 32 questions
Android interviewfragen und antworten - Total 14 questions
Mobile Computing interviewfragen und antworten - Total 20 questions
Cryptography interviewfragen und antworten - Total 40 questions
RPA interviewfragen und antworten - Total 26 questions
Interview Tips interviewfragen und antworten - Total 30 questions
College Teachers interviewfragen und antworten - Total 30 questions
SDLC interviewfragen und antworten - Total 75 questions
Blue Prism interviewfragen und antworten - Total 20 questions
Memcached interviewfragen und antworten - Total 28 questions
GIT interviewfragen und antworten - Total 30 questions
Business Analyst interviewfragen und antworten - Total 40 questions
Splunk interviewfragen und antworten - Total 30 questions
DevOps interviewfragen und antworten - Total 45 questions
Accounting interviewfragen und antworten - Total 30 questions
SSB interviewfragen und antworten - Total 30 questions
Algorithm interviewfragen und antworten - Total 50 questions
OSPF interviewfragen und antworten - Total 30 questions
Sqoop interviewfragen und antworten - Total 30 questions
JSON interviewfragen und antworten - Total 16 questions
Computer Graphics interviewfragen und antworten - Total 25 questions
IoT interviewfragen und antworten - Total 30 questions
Insurance interviewfragen und antworten - Total 30 questions
Scrum Master interviewfragen und antworten - Total 30 questions
Accounts Payable interviewfragen und antworten - Total 30 questions
XML interviewfragen und antworten - Total 25 questions
GraphQL interviewfragen und antworten - Total 32 questions
Bitcoin interviewfragen und antworten - Total 30 questions
Active Directory interviewfragen und antworten - Total 30 questions
Laravel interviewfragen und antworten - Total 30 questions
Tableau interviewfragen und antworten - Total 20 questions
Adobe AEM interviewfragen und antworten - Total 50 questions
Kubernetes interviewfragen und antworten - Total 30 questions
Microservices interviewfragen und antworten - Total 30 questions
Apache Kafka interviewfragen und antworten - Total 38 questions
Fashion Designer interviewfragen und antworten - Total 20 questions
Desktop Support interviewfragen und antworten - Total 30 questions
IAS interviewfragen und antworten - Total 56 questions
PHP OOPs interviewfragen und antworten - Total 30 questions
OOPs interviewfragen und antworten - Total 30 questions
Linked List interviewfragen und antworten - Total 15 questions
Dynamic Programming interviewfragen und antworten - Total 30 questions
SharePoint interviewfragen und antworten - Total 28 questions
CICS interviewfragen und antworten - Total 30 questions
Yoga Teachers Training interviewfragen und antworten - Total 30 questions
Nursing interviewfragen und antworten - Total 40 questions
Language in C interviewfragen und antworten - Total 80 questions
Behavioral interviewfragen und antworten - Total 29 questions
School Teachers interviewfragen und antworten - Total 25 questions
Statistics interviewfragen und antworten - Total 30 questions
Digital Marketing interviewfragen und antworten - Total 40 questions
Apache Spark interviewfragen und antworten - Total 24 questions
Full-Stack Developer interviewfragen und antworten - Total 60 questions
IIS interviewfragen und antworten - Total 30 questions
System Design interviewfragen und antworten - Total 30 questions
VISA interviewfragen und antworten - Total 30 questions
SEO interviewfragen und antworten - Total 51 questions
Google Analytics interviewfragen und antworten - Total 30 questions
Cloud Computing interviewfragen und antworten - Total 42 questions
BPO interviewfragen und antworten - Total 48 questions
ANT interviewfragen und antworten - Total 10 questions
HR Questions interviewfragen und antworten - Total 49 questions
REST API interviewfragen und antworten - Total 52 questions
Content Writer interviewfragen und antworten - Total 30 questions
SAS interviewfragen und antworten - Total 24 questions
Control System interviewfragen und antworten - Total 28 questions
Agile Methodology interviewfragen und antworten - Total 30 questions
Hadoop interviewfragen und antworten - Total 40 questions
Banking interviewfragen und antworten - Total 20 questions
Checkpoint interviewfragen und antworten - Total 20 questions
Blockchain interviewfragen und antworten - Total 29 questions
Technical Support interviewfragen und antworten - Total 30 questions
Mainframe interviewfragen und antworten - Total 20 questions
Nature interviewfragen und antworten - Total 20 questions
Chemistry interviewfragen und antworten - Total 50 questions
Docker interviewfragen und antworten - Total 30 questions
Sales interviewfragen und antworten - Total 30 questions
Knockout JS interviewfragen und antworten - Total 25 questions
TypeScript interviewfragen und antworten - Total 38 questions
PowerShell interviewfragen und antworten - Total 27 questions
Terraform interviewfragen und antworten - Total 30 questions
JCL interviewfragen und antworten - Total 20 questions
JavaScript interviewfragen und antworten - Total 59 questions
Ajax interviewfragen und antworten - Total 58 questions
Express.js interviewfragen und antworten - Total 30 questions
Ansible interviewfragen und antworten - Total 30 questions
ES6 interviewfragen und antworten - Total 30 questions
Electron.js interviewfragen und antworten - Total 24 questions
RxJS interviewfragen und antworten - Total 29 questions
NodeJS interviewfragen und antworten - Total 30 questions
jQuery interviewfragen und antworten - Total 22 questions
Vue.js interviewfragen und antworten - Total 30 questions
ExtJS interviewfragen und antworten - Total 50 questions
Svelte.js interviewfragen und antworten - Total 30 questions
Shell Scripting interviewfragen und antworten - Total 50 questions
Next.js interviewfragen und antworten - Total 30 questions
BGP interviewfragen und antworten - Total 30 questions
Ethical Hacking interviewfragen und antworten - Total 40 questions
Cyber Security interviewfragen und antworten - Total 50 questions
PII interviewfragen und antworten - Total 30 questions
Data Protection Act interviewfragen und antworten - Total 20 questions
Unix interviewfragen und antworten - Total 105 questions
Weblogic interviewfragen und antworten - Total 30 questions
Tomcat interviewfragen und antworten - Total 16 questions
Glassfish interviewfragen und antworten - Total 8 questions
Ubuntu interviewfragen und antworten - Total 30 questions
Linux interviewfragen und antworten - Total 43 questions
ETL Testing interviewfragen und antworten - Total 20 questions
QTP interviewfragen und antworten - Total 44 questions
Cucumber interviewfragen und antworten - Total 30 questions
Postman interviewfragen und antworten - Total 30 questions
TestNG interviewfragen und antworten - Total 38 questions
SDET interviewfragen und antworten - Total 30 questions
Selenium interviewfragen und antworten - Total 40 questions
Kali Linux interviewfragen und antworten - Total 29 questions
Mobile Testing interviewfragen und antworten - Total 30 questions
UiPath interviewfragen und antworten - Total 38 questions
Quality Assurance interviewfragen und antworten - Total 56 questions
API Testing interviewfragen und antworten - Total 30 questions
Appium interviewfragen und antworten - Total 30 questions
Symfony interviewfragen und antworten - Total 30 questions
GWT interviewfragen und antworten - Total 27 questions
CSS interviewfragen und antworten - Total 74 questions
Ruby On Rails interviewfragen und antworten - Total 74 questions
Yii interviewfragen und antworten - Total 30 questions
Angular interviewfragen und antworten - Total 50 questions
PHP interviewfragen und antworten - Total 27 questions
Oracle JET(OJET) interviewfragen und antworten - Total 54 questions
Frontend Developer interviewfragen und antworten - Total 30 questions
Zend Framework interviewfragen und antworten - Total 24 questions
RichFaces interviewfragen und antworten - Total 26 questions
HTML interviewfragen und antworten - Total 27 questions
Flutter interviewfragen und antworten - Total 25 questions
CakePHP interviewfragen und antworten - Total 30 questions
React interviewfragen und antworten - Total 40 questions
React Native interviewfragen und antworten - Total 26 questions
Web Developer interviewfragen und antworten - Total 50 questions
Angular 8 interviewfragen und antworten - Total 32 questions
Angular JS interviewfragen und antworten - Total 21 questions
Dojo interviewfragen und antworten - Total 23 questions

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Interview Questions and Answers

Freshers / Beginner level questions & answers

Ques 1. What is Wicket Framework?

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Ques 2. What are Wicket Models?

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Ques 3. What are the Ways to create a page in wicket?

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Ques 4. What is about WebAppication in Wicket?

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Ques 5. What is Base class for HTML pages?

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Ques 6. Dependency to start wicket.

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Ques 7. A sample web application using apache wicket.

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Ques 8. How to create a TextField in Apache-Wicket?

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Ques 9. How to submit a form in apache-wicket?

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Ques 10. Example of Username validation in apache-wicket.

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Ques 11. How to create a password field in apache-wicket?

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Ques 12. How to create a TextArea in apache-wicket?

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Ques 13. How to create checkbox in apache-wicket?

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Ques 14. How to create multiple checkboxes in apache-wicket?

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Ques 15. How to create Radio button in apache-wicket?

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Ques 16. How to create single selected ListBox?

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Ques 17. How to create multiple selected ListBox in apache-wicket?

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Ques 18. How to create DropDown Choice in apache-wicket?

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Ques 19. How to create FileUpload field in apache-wicket?

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Experienced / Expert level questions & answers

Ques 20. How to create Select Option as menu wise in apache-wicket?

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Ques 21. What is Pallet component in apache-wicket?

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Ques 22. How to create custom validator in apache-wicket?

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Ques 23. How to integrate apache-wicket with Spring?

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Ques 24. How to get ServletContext in apache-wicket application?

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Ques 25. How to keep file validation in apache-wicket if no file has been selected?

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Ques 26. How to create 404 error page?

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