Persistence

JavaFX 2 with JPA 2 and Drag and Drop – Part 3

This article will cover a method that can be used to include more than one entity type in a tree (the same system will work for other widgets such as lists and tables) by using a proxy holder. The previous articles in this series covered setting up the demo application and getting started with JPA.

Simple CRUD Example – Part 2

In the last article I showed you how to create a Debry database and set up a persistence unit. In this article I’ll create a very basic CRUD application. Using JSF 2, JPA 2 and EJB 3.1.

JPA2 Serialized Blob Never Really Null

This one got me late on a Friday (actually after work so I was doubly frustrated) and is to do with how JPA2 persists attributes of items that are not of basic Java types and which are also not entities. In order words attributes that implement Serializable and get shoved into BLOB fields.

Local transaction already has 1 non-XA Resource

While developing a bit of functionality that transferred data from one database to another in my current JEE 6 web application I came upon the exception below. Surprisingly for exceptions from deep within system this one is actually quite informative if you understand what it’s saying: the key is knowing that XA means distributed transaction. Transactions can be …

Local transaction already has 1 non-XA Resource Read More »

JPA 2 Eager Fetching on a Collection

Quick little JPA 2 issue that I faced today that I’m sure many other people have run into especially when starting out. The problem was and error message such as the one shown below when attempting to display the contents of a Set of other entities in a JSF page