Posts tagged jpa
Dear Java/JEE developer – why should you care about ADF?
1Whether you are deciding on the framework to use for your next Java web or mobile project or whether you are contemplating your next career step as a Java EE developer, ADF should be on your short list for consideration. With a new free version, deployment on many application servers including Tomcat, JBoss and GlassFish, extended support in both Eclipse and JDeveloper, and a Java based mobile solution for both iOS and Android – ADF has a lot to offer.
ADF is the Java EE Application Development Framework from Oracle. ADF allows developers to develop rich, enterprise grade Java web and mobile applications in a very productive manner. Many of the generic (plumbing) concerns that need to be addressed for most Java/JEE applications are taken care of by the framework – allowing developers to focus on the business specific functional areas. The initial 80% of the application is created through largely declarative development – 4GL style. The remaining 80% is dealt with in a fairly ordinary coding style, similar to plain Java EE development or to development using other frameworks.
This article discusses the question why any Java/JEE developer should know and care about ADF. It will More >
WebLogic 12c: Use JPA in your Web Application
3Where as in WebLogic 11g JPA was not support by default, in WebLogic 12c it is the default persistency provider.JPA 2.0 is part of JAVA EE 6.
I was trying some new JAVA EE 6 features in WebLogic 12c, so here is a is a way to create a Web Application with JPA under WebLogic 12c
Some of the JAVA EE 6 specifications we’re already supported in WebLogic 11g. JPA 2.0 was one of them. Though version 1.0 was the default. 2.0 also worked.Unless an explicit <provider>…</provider> wass specified in the persistence.xml file of a deployed application, WebLogic 11g used OpenJPA/Kodo by default.
The default JPA provider setting is exposed via a new MBean: JPAMBean on the DomainMBean, and persists the configuration into the config.xml file.
Furthermore, you needed to install the patch QWG8 – Enable JPA 2.0 support on WebLogic Server.
To make it work on 11g, you had to use Oracle TopLink as the persistency provider like the image shows you in the WebLogic Admin Console
Now for 12c this is not needed anymore, TopLink will be the default JPA Provider
Using JPA to persist the Tour de France Java Object Graph to relational database tables
1In a recent article – http://technology.amis.nl/blog/12786/building-java-object-graph-with-tour-de-france-results-using-screen-scraping-java-util-parser-and-assorted-facilities – I described how I retrieved the statistics for recent Tour de France editions from the official Tour de France website from my Java program and constructed an Java Object Graph for the data on stages, riders and rankings. In this article, I will show how I have persisted that data, from the Java Objects to Relational Tables in my local Oracle XE database. Note: the fact that this concerns Tour de France data is not really relevant for this story – it is a generic story about how JPA is used to map and persist Java Classes and Objects to a relational database.
The Class diagram for the classes involved looks like this:
The Java program discussed in the previous article retrieves data from the Le Tour De France website and creates an Object Graph according to these object definitions. Note: in comparison with the previous article, I have already applied a few small changes that will help with othe ORM mapping that JPA will do for me. The stage and rider references in Standing as well as the tour references More >
Masterclass for Java Developers – Make that Database Work for You! 17th December 2010
3Really getting the most out of your database. That would be nice, given wat databases can do (and what you may have paid for them).
Few serious Java Applications are completely devoid of interaction of some kind with a database.
However, most ORM and  Java Persistency frameworks do their utmost to hide the database and all it can do from the Java application and very few Java developers can truly leverage the full capabilities of the database their application works with. For all intents and purposes, the database in many cases is still nothing more than a flat storage cabinet.
On 17th December I will present a Masterclass that demonstrates how Java applications can benefit from the functionality on offer from underlying databases in a way that does not impact the application architecture, introduces breaches of open standards or creates undesirable coupling. Using plain JDBC, JPA frameworks and alternative interaction channels – for example http-based RESTful interaction – this seminar demonstrates through many examples how [Java] applications can become better performing, more elegantly designed and more productively developed as well as more scalable and robust.
Report from presentation ‘JPA 2.0 – What’s new’
The Java Specification Request 317 (JSR-317) aka JavaTM Persistence 2.0, (JPA 2.0) has finally reached the last stage, “Completion of Reference Implementation (RI) and Technology Compatibility Kit (TCK)”, before it’s officially released. Therefore last week a Knowledge Class was given at Amis with a presentation of the new functionality and differences compared to JPA 1.0 and some hands-on exercises. (more…)
Rapid development of Rich JSF Web applications on top of EJB/JPA persistence (JSF on Rails – Demo 1)
Here you will find the first demo from my Devoxx 2008 presentation. It shows how you can rapidly create a rich web application based on Java Server Faces and EJB/JPA persistency using JDeveloper 11g and the ADF 11g framework. The presentation included below shows the steps one by one to create a rich web application. The JDeveloper 11g application can be downloaded as well. The end result looks something like:
it includes such features as: master detail tables with synchronization; column sort; run time column manipulation: resize, reposition and hide/show; popup with detailed context data; data driven, synchronized chart; accordion for better page real estate usage.
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