===== Java Persistance API =====
JPA is an API, provided by Oracle.

Hibernate, EclipseLink etc. are implementations of that API.


=== Entity ===
=== Entity Annotaions ===

These annotations should be red as following:
  * The first part is applied to the object, which contains the property
  * The second part is applied to propery (which should be an entity)

|<WRAP><code>
class wood

@OneToMany
@JoinColumn(name="wood")
Set<Tree> tree
</code></WRAP>| Object **wood**. Property **tree**. One wood has many trees. Property has to be a collection |
|<WRAP><code>
class tree

@ManyToOne
@JoinColumn(name="tree")
Wood wood
</code></WRAP>| Object **tree**. Property **wood**. Many trees in wood. |