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Starting with version 3.5 (currently CR2), Hibernate Annotations 3.x and Hibernate EntityManager projects have been merged into the Hibernate Core codebase as invidual modules. As a surprising addition, Hibernate Envers subproject is added as well (that’s a great thing as you get Auditing, out of box hereafter). So if you’re stuck with Hibernate 3.3.x and [...]

Debugging Hibernate exceptions for users not so familiar with Hibernate can be frustrating. The following exception is a common source of error:- Lets try to understand the error with a use case first. The most common scenario when this exception occurs is while trying to save a collection object (but calling save/persist on parent) Consider [...]

Hibernate Validator is a very precise framework written in the hibernate umbrella of frameworks. Using the inbuilt validators should solve most of your column constraints. However, if you have Decimal types (Float, Double of BigDecimal), there is no inbuilt validator to validate both the precision and scale. Also, I’ve stopped using Doubles and Floats in [...]

Say, you have two entities which have a many to many relationship (Foo and Bar). Using JPA/Hibernate, they are mapped like this, with the owning entity being Foo. public class Foo { …….. @ManyToMany @JoinTable(name="foos_bars", joinColumns = { @JoinColumn(name = "foo_id") }, inverseJoinColumns = { @JoinColumn(name = "bar_id") }) public List<bar> getBars() { return bars; [...]