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Prepare Interview

Apache Wicket Pertanyaan dan Jawaban Wawancara

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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