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Core Technologies

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Table of Contents [-]

  1. Introduction
    1. Frontend
      1. Struts and Tiles
        1. Taglibs
          1. Javascript
          2. Business Layer
            1. Spring
            2. Database Access
              1. Hibernate
                1. JDBC
                  1. SQL
                  2. Development

                    Note: This document is part of the Liferay Core Development Guidelines

                    Introduction #

                    This article describes the main technologies used within Liferay as well as which of their features of them are being used. As a Liferay Core developer you should use this feature set whenever you want to extend the existing functionality of Liferay or to implement a new functionality.

                    Frontend #

                    Struts and Tiles #

                    Most Liferay portlets are developed using Struts through a custom bridge for portlets called StrutsPortlet.

                    Features Not Used:

                    • Struts Forms: Liferay almost never uses Struts Forms. Try to avoid them as much as possible.
                    • Validation: We do validation in the Service Layer

                    Taglibs #

                    Liferay uses Taglibs extensively. The standard JSTL library is used, mainly for tags such as c:if and c:when / c:otherwise

                    Javascript #

                    Business Layer #

                    Spring #

                    Features Not Used:

                    • Aspects: They will be probably introduced in the near future.

                    Database Access #

                    Hibernate #

                    Hibernate is used to access the database in most situations.

                    Features Not Used:

                    • Criteria API: We found some problems with some of the supported databases

                    JDBC #

                    JDBC is used directly to perform custom queries. See the Finder classes.

                    SQL #

                    It's sometimes used when using JDBC instead of Hibernate.

                    Use very simple SQL to guarantee that it'll work in all of Liferay's supported databases.

                    Development #

                    The following tools are used to develop Liferay's core:

                    • Ant
                    • Java 5
                    • Tomcat
                    • MySQL
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                    Comments
                    Threaded Replies Author Date
                    This is a useful high-level overview but it... Istvan Tech November 29, 2013 1:15 AM

                    Istvan Tech
                    This is a useful high-level overview but it would be good to have some Liferay version info too, so it could be measured up approximately what is the chance that the content became out-of-date.
                    Thanks
                    Posted on 11/29/13 1:15 AM.