Which programming language is mainly used for developing applications in Liferay?

The primary programming language used for developing applications in Liferay is Java. Liferay is built on a Java-based platform and leverages the Java EE (Enterprise Edition) framework to provide a robust environment for developing web applications. This choice is essential because most of the core functionalities, including portlet creation and backend development, rely heavily on Java.

In Liferay, developing custom portlets, services, and leveraging various APIs requires a good understanding of Java. Additionally, Java allows developers to utilize popular frameworks and libraries that enhance the functionality and performance of the applications built on Liferay. For instance, when developers create custom business logic or integrate with external services, they typically do so using Java.

While other programming languages like JavaScript are also used in Liferay for front-end development (such as improving user interaction and experience through client-side scripting), the backbone of the Liferay platform and its developmental ease is centered around Java. This makes Java the most critical language for Liferay development, fulfilling the needs of both back-end processes and server-side logic.