With the advent of Hibernate (and many similar tools) the Java EE team decided to propose a new pattern to guide ORM frameworks using a single language. Use Hibernate Old Fashioned Way, without Spring These two models are similar in that both work using similar structures to represent business logic, and they are distinct in that they were designed for different purposes: one to store data, other to describe behavior. The relational model, which is prevalent in databases, and the object-oriented model. Fast forward to today, and most Java applications use both Spring and Hibernate.įor some time now, developers have operated under one of two separate but distinct models to represent business entities. Shortly after, Spring came along and added abstractions for Hibernate that took API simplification even further. Not only that, but it had a very Java-esque API that made it easy to create CRUD POJOs. Hibernate came along and changed everything by allowing you to map POJOs (plain ol’ Java objects) to database tables. Not only that, but there’s nothing in JDBC that helps you create your database. Using JDBC can be tedious if you don’t like writing SQL. If you’ve been developing for more than 15 years, you probably remember the days of JDBC in Java. The following JPA annotations and enums are designated for mapping a JPA object model to a relational database.Java developers typically encounter the need to store data on a regular basis.

Many other JPA annotations are designated for Object Relational Mapping (ORM) JPA providers (for mapping between a relational database and an object model and for direct SQL queries): The following JPA annotations are in use to integrate JPA into a Java EE application and are managed by the Java EE container: The following annotations can mark methods as JPA callback methods:

At the field level, an optional GenerationType strategy is can also reference a value generator, which is defined at the class level by using one of the following annotations:Īnnotations for JPA lifecycle event callbacks: JPA 2 provides an annotation and an enum for setting the access mode:Īutomatically generated values are mainly useful for primary key fields, but are supported by ObjectDB also for regular (non primary key) persistent fields. Persistence fields can either be accessed by JPA directly (as fields) or indirectly (as properties and get/set methods). Specifying a relationship annotation enables configuring cascade and fetch policy, using the following enum types:Īdditional annotations are supported by ObjectDB for the inverse side of a bidirectional relationship (which is calculated by a query) :Īnnotations for additional JPA configuration: Unlike ORM JPA implementations, ObjectDB does not enforce specifying any of the annotations above. The four relationship modes are represented by the following annotations: Relationships are persistent fields in persistable classes that reference other entity objects. Other additional annotations (and enum) are designated for date and calendar fields: The way a field of a persistable class is managed by JPA can be set by the following annotations:Īdditional annotations (and enum) are designated for enum fields: The following annotations are used to define static named JPA queries:Īnnotations for fields in JPA persistable classes: Īnother JPA class annotation defines an ID class, ID classes are useful in representing composite primary keys. JPA defines three types of persistable classes which are set by the following annotations:Įntity and mapped super classes can be further configured by annotations that specify cache preferences and lifecycle event listener policy.

JPA defines dozens of annotations that can be divided into the following groups: In this tutorial we are just listing out the annotations, annotation details and their examples will be studied in the subsequent chapters. In this tutorial we will list out all the JPA annotations.

Spring jpa annotations