Liferay is a widely used and recognized open-source platform. Many top MNCs worldwide rely on Liferay to streamline their business processes. The demand for Liferay pros is skyrocketing with lucrative packages. If you’re the one who is aiming to get a job like Liferay Developer in top companies, then this blog can help you prepare for the interview.
This Liferay Interview Questions blog covers topics on Liferay Scenario, portal, OSGi, DXP, administration, and more to keep you updated with the latest changes. Navigate through them carefully and prepare accordingly to improve your chances of getting hired.
|Types of Liferay Interview Questions|
If you are a beginner or fresher in this field and it might be your first job, you can expect the following basic Liferay questions.
Liferay is a Java-based open-source portal and social platform that complies with JSR 286. It includes 60+ completely functional built-in portlets and many interaction points for simple integration with third-party software such as Alfresco and Sharepoint.
Liferay offers many features, including well-written code, a friendly community, and more, making it suitable for a wide range of needs. Also, it’s a portal that thrives as a content-centric platform.
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Liferay DXP is a Java-based platform that can be customized by adding new applications, modifying behavior, and creating new themes.
Liferay is a robust and versatile content management system (CMS) that allows you to make significant changes to how you do business. It is one of the most widely used content management systems (CMS) for managing and maintaining websites, and many industry experts highly recommend it.
One folder above Tomcat's install location is Liferay Home. The installation location of your Tomcat server will be referred to as $TOMCAT HOME. Download a Liferay/Tomcat bundle from the Help Center if you already have a Tomcat server.
The list of new features are as follows:
A service.xml is a configuration file that contains information about database entities used in a portlet. The DAO/DTO classes for a portlet generate the service builder using the service.xml file. The Liferay server builder also uses service.xml to construct database tables and columns for the entities listed in service.xml.
The web component’s Servlet and Portlet generate content for user requests. Both utilize a variety of situations. By contrasting the qualities of Servlet vs. Portlet, below are some differences between portlet and servlet.
|Portlet responds to user requests using various methods such as render, process action, serveResource, processEvent, etc.||The service method is the only way for a servlet to respond to a user's request.|
|A distinct object called Portlet Request / Portlet Response will be accessible to the Portlet.||The Servlet Request and Servlet Response objects can be accessed directly by the Servlet.|
Liferay 7 has shifted to a modular framework, with a module serving as the sole development unit. In a nutshell, a module is a Liferay 7 plugin that consists of a set of classes, each with its MANIFEST file and extra resources, all bundled into a JAR file.
Navigate to File --> New --> Liferay Module Project to create a new Liferay module project.
Liferay CE 6.2 GA1 (6.2. 0) or Liferay EE 6.1 GA2 is the latest version.
|Related Article: Liferay Tutorial|
Liferay DXP is a comprehensive software foundation that bridges the gap between old and new, allowing complicated processes to be more accessible to their consumers.
This section contains questions of Liferay scenario-based with answers to help you crack your interview.
It’s not possible to set a session timeout for a portlet in the Liferay portal.
Every portlet application's instantiable flag is set to true in Liferay-portlet.xml, located in the WEB-INF directory. If this flag sets to false, a portlet is added once on the portal page.
The portlet can deploy as a web service using ANT's build WSDL target. Remote Portals are referred to as web services in JSR 286. You may find instructions for creating a web service portlet.
Yes, you can install JDK without JRE.
You can set up a Liferay DXP on a cluster in the following way:
By adding the full-screen option, Liferay enables any portlet to manage images.
Portal-ext. Property is a file that contains several configurable options. These options can be changed or expanded in portal-ext. Properties, for instance, there is no section for database pool.
The methods for upgrading from Liferay 5.2.3 to Liferay 6 lists on the Liferay website. However, one should be aware of how to back up a database and patch Liferay in general.
The ability to deploy and re-deploy Liferay portlets without restarting the Liferay server is known as "hot deployment." The deploy target of Liferay's ANT build script or the Eclipse plugin, which utilizes this ANT script internally, can be used for hot deployment.
Liferay uses the OSGi framework to offer a modular application development environment. To provide a platform that is simple to develop, Liferay DXP employs several OSGi best practices. Below we’ve listed oft-asked Liferay OSGi interview questions for your preparation.
OSGi (Open Service Gateway Initiative) is a Java platform for creating and distributing modular software. OSGi has two sections.
Listed are a few benefits of the OSGi framework:
OSGi makes it easy to create and manage modular Java components (known as bundles) deployed in containers. You create one or more bundles using the OSGi specification and tools. Components, Services, Bundles, and Modules are all managed by OSGI Container.
MOTECH modules are all run in a Felix OSGi framework instance contained in the platform war. As a result, all of the libraries you need in your module get packed as OSGi bundles. Because all that is (theoretically) required to make a library OSGi-ready is to add a few entries to the META-INF/MANIFEST file. Many major Java libraries are OSGi enabled by default, according to MF.
A bundle is a JAR file that contains resources in OSGi. It comprises a manifest file that describes the JAR file's contents and provides information to the end users.
There's not much of a distinction. The formats are identical; a JAR is a bundle, and a bundle is a JAR. On the other hand, a usable bundle must include OSGi metadata in its manifest so that an OSGi framework can manage class visibility across the bundle.
OSGi is a collection of Java-specific requirements for a dynamic component system. These specs allow for a development methodology in which an application has numerous components bundled together. Locally and via the network, these components communicate by services.
OSGi defines a dynamic module system for JavaTM. OSGi applications deployed to WebSphere® Application Server use an Enterprise Java profile included in the server runtime environment. This environment also contains the OSGi framework to run OSGi applications.
If you're planning to attend a Liferay Administration interview, here are some questions and answers that you need to consider.
The control panel acts as a user interface for creating and maintaining:
To add Organization
There are two types of pages: site-level and user-level pages.
Sites are organized hierarchically in the same way that organizations can. Sites manage pages, content, application data, and users (through site memberships), whereas organizations merely group users.
n Organization is a hierarchical grouping of Liferay Users. For example, one of your company's departments (such as Human Resources) could be a Liferay organization. Organizations frequently have their websites.
The Control Panel allows you to manage your site templates. They enable portal administrators to construct several sites with the same set of pages and content as the default.
Page Templates help you efficiently create pages based on predefined layouts and content. You may also start your Content Page Templates and Widget Page Templates.
The Documents and Media library in Liferay DXP allows you to store files online as you do locally. It may hold any sort of file and mount and browse external repositories, and function as a virtual shared drive.
In this section, let’s see questions and answers based on the Liferay portal for both freshers and experienced.
Liferay portal is a free and open-source enterprise platform written in Java and distributed under the GNUlesser general public license and optional commercial license.
A Portal application is a web application in the central point which brings all the information together from diverse sources in a uniform way and may contain all collections of web content, and other resources like files, images, documents, Web Pages, and websites.
The list of Liferay portal features are:
The benefits of using Liferay Portal for your website are simple:
There are four different types of roles, which are as follows:
The Liferay Portal platform is a collection of standard web application development tools. It’s a site-building framework that includes a lot of customizable components. The Liferay Portal application package includes:
The Portlet lifecycle has the following phases:
Liferay Search can be customized in two different ways, depending on our needs.
Follow these five steps to set up a Liferay Cluster:
Portlet Preferences are properties that help to store basic portlet configuration information. Administrators frequently use preferences to give users a customized view of a portlet.
The integer value p_p_ life cycle represents the portlet lifecycle phase to which the portlet belongs:
To access Liferay Portal, follow the steps:
This section covers questions on Liferay DXP from basic to advanced.
The Digital Experience Platform (DXP) is a new type of enterprise software that aims to address the needs of businesses undertaking a digital transformation to improve customer experiences.
Companies can use DXPs to digitize corporate operations, create connected customer experiences, and collect actionable customer insight.
Listed are a few differences between Liferay Module and Liferay Plugin:
Liferay Module Liferay Plugin
|Liferay Modules are OSGi bundles packed as JAR files.||WAR files help to bundle Liferay Plugins as web apps.|
|All of the problems associated with classloader issues get avoided.||More Class loaded issues are visible.|
|There is no class definition found. The runtime will eliminate errors.||In the runtime, we regularly see No Class Definition Found; Class Not Found problems.|
|Portlet Modules and Hook Modules are two types of Liferay Modules.||Portlets, themes, text, layout, and hooks are all examples of Liferay plugins.|
|Once the module gets deployed, it is available in the Liferay Portal Server Bundle directory within the OSGi directory.||In the Liferay Portal Server web apps directory, you can find all Liferay Plugins.|
|Liferay Modules include a variety of tools such as Liferay IDE, Liferay Studio, and BLADE CLI.||Liferay Plugins include programs like Liferay IDE and Liferay Studio.|
A content management system is the (CMS) back of digital bone identity, strategy, and engagement software. A DXP is a collection of tools that enable the creation of personalized experiences that scale and connect across channels, locations, and languages.
MVC Portlet applications are web modules with at least one portlet class registered as a component in Liferay's runtime environment. Web modules employ standard OSGi metadata to identify themselves and build in any environment.
Liferay has been a long-time member of the MQ for Horizontal Portals.
The function that a portlet performs indicates it is a portlet mode. Depending on the process, portlets typically execute different activities and generate specific content. The portlet container gives the portlet the current portlet mode when invoked.
A few of the Liferay DXP Portlet modes are:
If you're an experienced professional in this field and wish to advance in your career, here are some Liferay interview questions to prepare.
The Liferay Portal includes default configurations in portal. Property information. You can override the characteristics in the doorway.properties file using the entryway ext. Properties file and provide a clean way to retain your reproduction of designs that may be used beyond the entranceway while also making it simple to update the doorway.
We occasionally need to establish a connection between two portlets. For example, when an action is performing one portlet, the end-user will send it to another portlet where an outcome is displayed based on the activity performed in the first portlet. It is possible to claim that it is a stab at the striker-catcher instrument.JSR style encrypts portlet communication, ensuring that your portlets are working on another JSR-compliant entrance server.
We must give area names at site formation, which it accepts as the site space’s name. Through the Liferay entrance control board, we must offer the exact space name that is required. A single Liferay Portal example (sites) demonstrates the facilitation of at least two space names using communities shown by a single Liferay Portal example (spots). We can supply the site URL and nuances like the site(community) depiction, participation kind, active status, and virtual host when we go to the control board – > Site settings – >.
Control board – > gateway settings – > Authentication – > LDAP – > LDAP – > LDAP – > LDAP – > LDAP – > LDAP – > LDAP – > LDAP
When LDAP confirms, we must provide the appropriate LDAP mappings, which effectively examine all of the details identified with clients and user groups from the LDAP catalog and import them into the Liferay entry.
Hooks help to customize JSPs or UIs if they are required. The Liferay entry package now includes all of the default worked-in portlets. If any customization of the center-level classes is required, EXT is typically employed.
The Liferay pack with the Tomcat application server is the ideal place to start for a clean setup.
Since you've got the most updated Liferay interview questions, you can start preparing for your following interview processes. Analyze the questions above to the real advantage to learn and comprehend solutions to land a fantastic job.
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Vinod Kasipuri writes about various IT platforms such as QlikView, Qlik Sense, and Perl Scripting, at Mindmajix. He loves to explain the concepts he writes in simple terms. He is also engaged in researching trends in AngularJS and LabView. Reach out to him via LinkedIn and Twitter.
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