- All questions are based on Liferay best practices when developing for Liferay DXP.
- Unless otherwise indicated in the question, assume a new Liferay installation with no additional plugins installed and no modifications to portal properties.
Back-End Developer 7.2
Example Test Questions
- Blade CLI lets you create projects that can be used only with Liferay Developer Studio.
- Which of the following statements about OSGi are true?
(Please select all correct answers.)
A. An OSGi component is any Java class inside a bundle that is declared to be a component.
B. An OSGi component doesn’t have a lifecycle.
C.A service is an OSGi component registered to the OSGi container's service registry.
D. Declarative services (DS) is a service that handles OSGi dependency injection and allows you to publish, find, and bind services based on XML metadata and annotations.
E. An OSGi component cannot be stopped.
Answer: A, C, and D
- Which command do you need to execute to close the connection to the Gogo Shell without shutting the OSGi container down?
Liferay offers developers a platform and a comprehensive set of tools for building web applications.
OSGi is at the center of Liferay's core technologies. Understanding OSGi concepts and architecture is paramount in Liferay development.
The Liferay platform is built on OSGi technology: Liferay applications are OSGi applications, and the platform has an embedded OSGi container.
The Apache Felix project provides the Gogo Shell and Felix Web Console tools for bundle management.
Liferay's user interface relies on portlets but not strictly on the standard portlet specification. Although there are many ways of building out your application's user interface, using the MVC pattern along with portlets as the implementation of the Controller and View Layer is still the essence of Liferay development.
A real-world Liferay application can make use of Liferay's time-saving tools and frameworks.
Liferay is compliant with many industry-proven standards.
As a developer, you may sometimes want to add a persistable and manageable attribute to an existing Liferay data model.
All Liferay core services have been designed and generated with the Liferay Service Builder pattern, which automatically generates service wrapper APIs for both remote and local service variants.
All Liferay platform applications are portlets. MVC Commands are portlet lifecycle handlers that implement the MVCCommand interface and are used to break up the controller layer into smaller and more manageable code entities. Although the Apache Struts MVC framework is being replaced with the MVC Commands in Liferay, the platform is still using the framework for some of the native functionalities like portal login and logout.
Lifecycle event listeners are OSGi components that implement the LifecycleAction interface.
Liferay Message Bus (LMB) is a service-level API for exchanging messages inside Liferay.
Liferay has an extensive search framework. Customization can be done on all layers, from the user interface to the indexing process and index settings.
Preparing for the Exam
Achieving recognition as a Liferay Certified Professional Back-End Developer demonstrates that you understand core concepts for developing Liferay modules and know how to follow Liferay best practices to develop robust, elegant, and maintainable solutions based on the Liferay Platform. The exam is designed to be challenging, yet fair for Liferay developers. Here’s how you can succeed:
- This exam is based off of the Liferay Training course Back-End Developer.
- Attend the Back-End Developer training course. Attending training is not required before you sit for the exam, but much of the exam material is based on concepts covered in training.
- Review additional source material. Liferay Developer Network is an amazing complementary source of information for the exam.
- Get hands-on development experience. Some of the topics covered on the exam require the kind of knowledge that comes from real experience developing for the Liferay Platform. If you have attended a developer training, be sure you've completed and reviewed all of the exercises presented during class, even the bonus exercises. If you haven't attended training, spend some time developing applications and customizations. It would also be helpful to review Liferay’s source code to ensure you're familiar with Liferay's best practices.
- Show up to the testing center with the required identification and take the 90-minute exam.
How to Register
Please fill out the form below to verify an individual's completion of an official Liferay Training or Exam.