Простые Java-объекты (POJO)

Type of object in Java programming language
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:
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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. The term continues an acronym pattern to coin retronyms for constructs that do not use fancy new features:

"Plain old JavaScript object" in JavaScript
"Plain old Ruby object" (PORO) in Ruby
"Plain old Documentation" (pod) in Perl
Plain old CLR object (POCO) in the NET Framework
"Plain old PHP object" (POPO) in PHP
Plain old telephone service (POTS) in telephony

Ideally speaking, a POJO is a Java object not bound by any restriction other than those forced by the Java Language Specification; i. e. a POJO should not have to
Extend prespecified classes, as inpublic class Foo extends javax. servlet. http. HttpServlet {
Implement prespecified interfaces, as inpublic class Bar implements javax. ejb. EntityBean {
Contain prespecified annotations, as in@javax. persistence. Entity public class Baz {
However, due to technical difficulties and other reasons, many software products or frameworks described as POJO compliant actually still require the use of prespecified annotations for features such as persistence to work properly. The idea is that if the object (actually class) were a POJO before any annotations were added, and would return to POJO status if the annotations are removed then it can still be considered a POJO. Then the basic object remains a POJO in that it has no special characteristics (such as an implemented interface) that makes it a "Specialized Java Object" (SJO or (sic) SoJO).

Ideally speaking, a POJO is a Java object not bound by any restriction other than those forced by the Java Language Specification; i. e. a POJO should not have to
Extend prespecified classes, as inpublic class Foo extends javax. servlet. http. HttpServlet {
Implement prespecified interfaces, as inpublic class Bar implements javax. ejb. EntityBean {
Contain prespecified annotations, as in@javax. persistence. Entity public class Baz {
However, due to technical difficulties and other reasons, many software products or frameworks described as POJO compliant actually still require the use of prespecified annotations for features such as persistence to work properly. The idea is that if the object (actually class) were a POJO before any annotations were added, and would return to POJO status if the annotations are removed then it can still be considered a POJO. Then the basic object remains a POJO in that it has no special characteristics (such as an implemented interface) that makes it a "Specialized Java Object" (SJO or (sic) SoJO).

Ideally speaking, a POJO is a Java object not bound by any restriction other than those forced by the Java Language Specification; i. e. a POJO should not have to
Extend prespecified classes, as inpublic class Foo extends javax. servlet. http. HttpServlet {
Implement prespecified interfaces, as inpublic class Bar implements javax. ejb. EntityBean {
Contain prespecified annotations, as in@javax. persistence. Entity public class Baz {
However, due to technical difficulties and other reasons, many software products or frameworks described as POJO compliant actually still require the use of prespecified annotations for features such as persistence to work properly. The idea is that if the object (actually class) were a POJO before any annotations were added, and would return to POJO status if the annotations are removed then it can still be considered a POJO. Then the basic object remains a POJO in that it has no special characteristics (such as an implemented interface) that makes it a "Specialized Java Object" (SJO or (sic) SoJO).