In software engineering, a plain old Java object (POJO) is an ordinary Java object, not bound by any special restriction. The term was coined by Martin Fowler, Rebecca Parsons and Josh MacKenzie in September 2000:[1]
"We wondered why people were so against using regular objects in their systems and concluded that it was because simple objects lacked a fancy name. So we gave them one, and it's caught on very nicely."[1]
The term "POJO" initially denoted a Java object which does not follow any of the major Java object models, conventions, or frameworks. It has since gained adoption as a language-agnostic term, because of the need for a common and easily understood term that contrasts with complicated object frameworks.[citation needed]
The term continues an acronym pattern to coin retronyms for constructs that do not use fancy new features:
"Plain old JavaScript object" in JavaScript[2]
"Plain old Ruby object" (PORO) in Ruby
"Plain old Documentation" (pod) in Perl
Plain old CLR object (POCO)[3] in the .NET Framework
"Plain old PHP object" (POPO)[4][5] in PHP
Plain old telephone service (POTS) in telephony
^ ab"MF Bliki: POJO". MartinFowler.com.
^Almaer, Dion (2006-07-17). "Return of the POJO: Plain 'Ole JavaScript". Ajaxian. Archived from the original on 2014-09-13. Retrieved 2014-08-19.
^Kneschke, Jan (2007-02-19). "typesafe objects in PHP". kneschke.de. Archived from the original on 2012-03-26. Retrieved 2012-05-27.
^Cheong, Jym (2011-06-26). "Controller with bare-bone Plain Old PHP Object aka POPO". jym.sg. Archived from the original on 2012-03-26. Retrieved 2012-05-27.
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