In object-oriented programming, a virtual function or virtual method is a function or method whose behaviour can be overridden within an inheriting class by a function with the same signature. This concept is a very important part of the polymorphism portion of object-oriented programming (OOP).

This tag is for questions related to the Java Persistence Criteria API (from JPA 2.0) which is used to define queries through the construction of object-based query definition objects, rather than use of the string-based approach of the Java Persistence query language. For questions related to (N)Hibernate Criteria, use the [icriteria] tag.

The purpose of the Akka HTTP layer is to expose Actors to the web via HTTP and to enable them to consume HTTP services as a client. It is not an HTTP framework, it is an Actor-based toolkit for interacting with web services and clients.

mPDF is a PHP library for generating PDF files from HTML with Unicode/UTF-8 and CJK support. It is distributed under the GNU General Public License. Although it is slower than its protoplast (fpdf library) it supports Unicode characters while fpdf does not.

ColdFusion is a server-side rapid application development platform, from Adobe. ColdFusion 9.0.1, was released on July 2010. ColdFusion 9.0.2 was released in May 2011

Processbuilder is Java wrapper around an Operating System Process. This class is used to create operating system processes.

A Python library and command-line tool for streamlining the use of SSH for application deployment or systems administration tasks. For questions about Google Fabric service, please use the tag [google-fabric]. For questions about FabricJs library, please use [fabricjs]. For questions about Hyperledger Fabric, please use [hyperledger-fabric]. For questions about the Minecraft modding toolchain Fabric, please use [minecraft-fabric].

The cat command is a standard Unix program used to concatenate and display files. The name is from catenate, a synonym of concatenate.

In version control, branches represent parallel lines of development. Merging is the action that integrates changes made in different branches.

Base class for Dialogs. A dialog in Android is a small window that prompts the user to make a decision or enter additional information. A dialog does not fill the screen and is normally used for modal events that require users to take an action before they can proceed.

Microsoft Windows Server 2012 R2 is a version of server operating system Microsoft Windows Server 2012 released on October 18, 2013