Definition
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 in public class Foo extends javax.servlet.http.HttpServlet { ...
- Implement prespecified interfaces, as in public 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.
Read more about this topic: Plain Old Java Object
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