JPA Annotations – @Temporal

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@Temporal annotation in JPA implementation can only be used with the fields and property get methods. Also, this annotation can be specified for the persistent fields or properties java.util.Data or java.util.Calendar. This annotation is available since the release of JPA 1.0. @Temporal solves the one of the major issue of converting the date and time […]

JPA Vs Hibernate

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I have come across this question from many of our readers and who ever working on the hibernate framework : What is the difference between Java Persistence API (JPA) and Hibernate ORM Framework. This post simply answer to those who are confusing with JPA and Hibernate difference. JPA and Hibernate Difference JPA is a specification for […]

JPA 2 Tutorials

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Java Persistance API (JPA) is the object relational mapping (ORM) specification for Java EE applications. JPA 2 is the second major release for the JPA framework with lot of interesting features. Many of the features introduced with this release are already supported by the many of the framework vendors like Hibernate, EclipseLink, etc. This JPA 2 […]

JPA 2 Criteria API

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One of the important feature in JPA 2.0 is using the Criteria API for forming the SQL queries. If you would have worked with the JPA 1.0 version, you must be familiar with the Java Persistence Query Language (JQL) which is similar to writing the SQL queries. This approach is good for the developers who are […]

TypedQuery in JPA 2

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One of the new feature introduced in JPA 2.0 is using the TypedQuery interface for building the query. This can be used with the CriteriaBuilder in JPA 2. As the name itself specifies, the main purpose of using the TypedQuery would be to narrow the result type and eliminate the need for type casting after […]

How To Create EntityManagerFactory in JPA

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This tutorial explains how to create EntityManagerFactory in your JPA application when you are writing your first JPA programming. It is the standard way of creating the factory if you use the JPA specification. Normally there are two ways to create the factory, one is through the configuration file persistence.xml and another one is through the […]

JPA EntityManagerFactory Vs Hibernate’s SessionFactory

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If you are using the JPA’s standard specification implementation (Read : Introduction to JPA), then you would use EntityManagerFactory for opening the session. But, if you are using the hibernate implementation, you have hibernate specific SessionFactory for managing the sessions. Here there is lot of confusion between developers like which one is the best approach. […]

JPA 2 MetaModel Generator using Ant

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In my previous article I have explained how to generate metamodel using your Eclipse IDE. However, in most scenarios you will have to create from your build scripts. This tutorial explains how to add this option in your ant script. For the detailed explanation on project example code, please refer the previous post. Here I […]

JPA 2 MetaModel Generation using Eclipse

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JPA 2.0 introduces the strongly typed Criteria API for going away with the Java Persistence Query (JQL) language. It comes with the metamodel for helping the typed objects. Every entity must have a meta model generated with underscore(_) added to its name. These objects will be referred in the Criteria API instead of using the […]

JPA 2.1 New Features

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JPA 2.1 adds lot of enhancements on top of the JPA 2.0 features. Some of the notable features are custom converters, criteria update, stored procedures, DDL generation, entity groups, etc. Here I have listed all the changes and explained few of the features. I will write examples for each features in the future articles. 1. […]

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