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Javier Paniza

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Top Stories by Javier Paniza

This article tries to demonstrate that Java can be more productive than Ruby. We are going to develop the same application of the article Rolling with Ruby on Rails Revisited (part 1 [1] and part 2 [2]) but using POJO [3]s annotated with JPA [4] and a Model Driven Framework, OpenXava [5] in this case. The result is that with less code, and less time you obtain a more powerful application. Ruby and rails: The regressive framework Ruby on rails [6] is so elegant, so easy, so productive. I cannot avoid read and heard continuously these comments. For example, the article Rolling with Ruby on Rails Revisited of Bill Walton says: “What would you think if I told you that you can develop a web application at least ten times faster with Rails than you can with a typical Java framework?” Oops! Ten times faster! Well, after these comments I decided to learn Ruby on Rails. I ne... (more)

OpenXava 3.1.4: Open Source Framework to Develop WebSphere Portal Applications

OpenXava 3.1.4 is an open source framework to rapid development of Portlet Enterprise applications deployable in WebSphere Portal 6.1. With OpenXava, you only need to write your model, POJOs and Java annotations. You do not need to write the view, and the controller (for CRUD, printing, etc) is reused. And from that you'll have an application for CRUD, report generation in PDF, export to Excel, searching, sorting, validations etc. You only need to write a simple Java class, no XMLs, no JSPs and no code generation. Look at the demos. If you current applications use JPA entities, ... (more)

Are the JPA Callback Methods Useful?

Definitely no. The section 3.5 of JPA specification states: "In general, the lifecycle method of a portable application should not invoke EntityManager or Query operations, access other entity instances, or modify relationships within the same persistence context. A lifecycle callback method may modify the non-relationship state of the entity on which it is invoked." Surely these restrictions have a good technical reason behind them, but from a business application developer perspective they mean that JPA callback methods are practically useless. For example, these scenarios are... (more)

OpenXava 4.2: Aplicaciones Web para iPad con Java o Groovy

OpenXava es una herramienta para el Desarrollo Rápido de aplicaciones Web, apropiada para aplicaciones de gestión y orientadas a bases de datos. A partir de v4.2 OpenXava también produce aplicaciones web para iPad que tienen la apariencia y comportamiento de las aplicaciones nativas de iPad. OpenXava permite desarrollar aplicaciones simplemente escribiendo clases del dominio con Java o Groovy. La interfaz de usuario se genera automáticamente en tiempo de ejecución, sin generación de código. Cuando el usuario accede a una aplicación OpenXava desde un iPad se genera una interfaz gráf... (more)

OpenXava 4.5: Open Source Rapid Development for WebSphere

OpenXava is an open source framework for Rapid Development of WebSphere and WebSphere Portal applications, well-suited for business and database oriented applications. OpenXava allows you develop applications just by writing simple domain classes with Java or Groovy. The user interface is generated automatically in runtime, without code generation. OpenXava 4.5 has some new interesting features such as: Support for all strategies of JPA inheritance mapping. Data for list and collections is obtained via JPA, before JDBC was used. Automated Business Logic (ABL) library added. All n... (more)