Please note that the following code examples exclusively use Java’s validation API, so these examples are in no way limited to Hibernate Validator. Hibernate Validator is merely used as the implementation of the used interfaces, but other implementations can be used as well. Validating a single field with Hibernate Validator is easy. Suppose that you have… read more
If you have a column in your database which may only contain the value 0 or 1 (i.e. a bit value), you probably want to map it to the boolean static type in your entity, rather than an integer. This could be the case for smallint, tinyint(1), int(1), boolean columns, etc. I found two suggestions… read more
With object-relational mapping (ORM) tools such as Hibernate, one usually modifies entities by first fetching them from the database, modifying some fields, and then persisting the entities again. This is a good approach in many cases, but in some scenarios this may not be desirable. For instance, if you want to update a collection of entities (i.e.… read more
I recently had a problem with one of my Spring Data JPA queries; for some reason, I was getting the following exception. query specified join fetching, but the owner of the fetched association was not present in the select list This seemed strange, because I had written a standard JPQL/HQL query that I knew worked.… read more
There are quite a few approaches to validating whether or not a given value already exists in a data store or not. In this article, I will show my solution to this problem by using Hibernate Validator in combination with Spring Framework. As you will see, the latter is solely used for injecting a dependency into… read more
If you are trying to bind a Spring MVC form to a bean, then you might have come across the below exception. Neither BindingResult nor plain target object for bean name ‘mybean’ available as request attribute Some tutorials claim that you can do like this: @Controller public class PersonController { @RequestMapping(value = "/person/add", method =… read more