I have an entity in my JBoss Seam-based project that makes use of Hibernate Validator annotations throughout. Although I've got directives in my JSF pages to require elements, etc. I'd like to be able to do one last failsafe validation before calling entityManager.persist() and ending up with a validation exception.
Is there any way to validate the entity programmatically? I've never worked that deeply with Hibernate/JPA, so I'd love to hear any recommendations for getting this working. Thanks!
Bean Validation API supports programmatic usage, see, for example, Hibernate Validator Reference.
If you are using JSF, you can have the validation to occur before your business method is called. If you are not seeing this, I would review the setup, as it should happen automatically and you wouldn't need to manually perform the validation. But you can do that, as you can see in axtavt's answer.
Related
I wonder if there is a java framework to journalize operations done on objects and then save them in database.
In fact, I'm working on an application where a particular object undergo many operations, each one is changing its logic (many conrols may be applicated on the object depending on user).
Now, I would like to trace controls or operations done on this object and store them in new tables serving just for statistics. I think that this could be implemented without modifying the whole exiting code of the application. I mean it could be seen as a vertical layer...
I have already seen the description of hibernate interceptors but I'm not sure that it could meet my needs
I would like also to precize that I'm working with spring core and hibernate..
Anyone has an idea about a java framework or an API meeting my need
thanks in advance..
I'm sure Hibernate Interceptors can be helpful for you. But, there is a little change that your entities might have to go through, because interceptors work when saving all the entities, you have to let the interceptor know that you are not interested in saving a few of them by adding custom annotations to them.
Other ways of doing is by using Spring AOP, you can log work without touching any of your code, but for this to happen, you need to be using spring in your environment already.
Other ways could be using traditional Servlet filters to do this.
There is a concept of Hibernate Event handlers, you may also look it up.
I've read that the new way of creating Hibernate DAO is using Hibernate contextual sessions. The main reason being to avoid the Spring based HibernateTemplate/HiberateDaoSupport and thus Spring-Free DAO.
When I searched what to do with Exception translation? It's written everywhere that I should use #Repository! #Repository does need import and creates dependencies in my code. Am I right?
Aren't annotations considered dependency? If they are, is there anyway I can have that using XML? Or should I use the old HibernateDaoSupport way, since I'm going to have my code coupled with Spring anyway?
Update
Found a similar question: "integrate hibernate with spring without spring dependency in dao" but:
The first paragraph of the answer that #pap has given does not specify any clear XML alternative for #Repository.
The insight offered in the rest of that answer is plausible, yet my question remains unanswered that if decoupling is not much of a concern, why did Spring try proposing the new approach to Hibernate DAO?
P.S. This is not a criticism. It's rather an attempt to learn the proper way of thinking about this topic (i.e. the dependency).
The point of Spring exception translation in the first place is to break a dependency on Hibernate by creating a dependency on Spring. Regardless of the annotation, Spring exception translation catches a Hibernate exception and turns it into a Spring exception. By putting catch statements in your code tied to the Spring exception you are coupling your code to Spring far more directly than by adding any #Repository annotations. If you don't want to depend on Spring then simply use the Hibernate exceptions directly. Basically, there are two approaches:
Use Hibernate for exceptions and contextual sessions (no coupling to Spring). In this case, simply don't use Spring exception translation at all.
Use Spring for exceptions and session handling (looser coupling to Hibernate, additional coupling to Spring).
we want to do business rule validation outside our java code using some xml etc.we are using Spring 3.1 and JSF 2.0.i tried to search but cudn't found concrete on placing business rule outside our java code.i will thankful if someone can provide direaction for this
I know this isn't exactly what you are looking for but you can use Hibernate annotations in place of hard coded validators in JSF 2.
These are just a few examples of this.
http://weblogs.java.net/blog/urubatan/archive/2006/09/aspectj_hiberna.html
http://docs.jboss.org/seam/1.1GA/reference/en/html/validation.html
I would like to use hibernate for persisting objects through web services and am thinking of using hyperjaxb3 with Apache CXF. Do you have any other suggestion for this purpose?
Edit: To clarify my question a little bit... I am using eclipse and wsgen, wsimport ant tasks to generate my service and client classes respectively. I am using annotations to configure entities which are persisted by hibernate. With this setting I encountered a few simple issues which I was able to fix by googling around. Then I encountered a problem with cyclic references which I fixed with afterUnmarshal (described here ). Afterwards I encountered a problem of entity with two parents (two bidirectional relationships) which I tried to solve with #XmlID and #XmlIDREF in the way described here but didn't make it in the end. And at that time I began to wonder if I am doing something wrong and should use different tools/technologies (should I maybe switch to maven, or introduce spring, etc.) so I investigated a little bit and found out about hyperjaxb3 and am wondering if that could be the solution to my problems? :)
Edit 2: In short, which way you use, prefer or just do in most cases involving these two?
EclipseLink JAXB (MOXy) has extensions for handling JPA entities, for more information see:
http://wiki.eclipse.org/EclipseLink/Examples/MOXy/JPA
Take a look the Spring MVC Tutorial, which you'd be able to integrate with Hibernate quite easily.
I once came across a validation framework for java, where you wrote one method that protected the integrity of the data-type and any CRUD operations on that data-type automatically called this method.
Does anyone know what this framework is? I simply want to avoid repetitive validation on every CRUD method attached to a data-type.
Here's a huge list of Java Validation Libraries / Frameworks - http://java-source.net/open-source/validation
Apache Commons has a validation framework.
Are you using Hibernate for persistence? If you are, there is Hibernate Validator.
Spring has a very nice validation and binding API.
Hibernate Validator, per adref's answer, is an implementation of JSR-303. Here's a helpful article to get you started if you are interested:
http://java.dzone.com/articles/bean-validation-and-jsr-303