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We are getting closer to a final release and this version is mainly about improving general performance and reducing the amount of round trips to the datastore. We also added optimistic locking support for datastores which provide atomic find-and-update operations.

We also worked on several bug fixes and improvements under the hood, you can read more about it in the release note.

Optimistic locking detection

With Hibernate ORM, you can add optimistic locking capability to an entity using the @Version annotation:

public class Flight implements Serializable {
    public Integer getVersion() { ... }

So far Hibernate OGM’s support for this was limited to CouchDB, which has its own proprietary optimistic locking mechanism. In this release we added support for optimistic locking also for those datastores that provide atomic find-and-update semantics such as MongoDB.

As always, you can either download a release bundle from SourceForge or get the JARs from the JBoss Nexus repository server using Maven, Gradle etc. The GAV coordinates are:

  • org.hibernate.ogm:hibernate-ogm-core:4.1.0.Beta8 for the OGM engine and
  • org.hibernate.ogm:hibernate-ogm-<datastore>:4.1.0.Beta8, depending on the backend you want to use.

What's next?

We are currently focused is on improving performance, documentation, polishing the API and fixing last minute bugs.

You're very welcome to raise your voice on the mailing list, ask questions in the forum or report any bugs or feature requests in the issue tracker.

After some time in the making, we are happy to announce the first Hibernate Validator release of the 5.2 series - 5.2.0.Alpha1. This release focuses mainly on Java 8 support, but we will get to this in a bit.

First a big thank you to Khalid Alqinyah who, as part of a Google Summer of Code project, implemented many of these new features.

So what's in it for you?

Java 8 support

Note: Java 8 is not a requirement for Hibernate Validator 5.2. Hibernate Validator is still backward compatible with Java 6. Java 8 specific features are only enabled when a Java 8 runtime is detected.

First off, the Java 8 date/time data types (JSR 310) are supported and can be validated via @Past and @Future. Also Optional and JavaFX types are supported via an improved ValidatedValueUnwrapper. ValidatedValueUnwrapper was already introduced in Validator 5.1, but works now in a more transparent way. Upon validation all registered ValidatedValueUnwrapper instances are checked. If a handler supports the validated type its handleValidatedValue method is called, provided that there exists no matching ConstraintValidator for the wrapper itself. This is best explained with an example:

@Size(min = 3) // the @Size constraint can only apply to the string value which gets automatically validated
private Optional<String> firstName = Optional.of( "John" );

@UnwrapValidatedValue(false) // Use @UnwrapValidatedValue(false) to ensure the wrapper itself is validated
private Optional<String> lastName = Optional.of( "Doe" );
Another Java 8 related feature is the ability to use type annotations on Iterable instances. Something like this:
private List<@AcmeEmail String> emails;
Note that the example is not using Hibernate Validator's @Email. Neither Bean Validation's built-in constraints nor Hibernate Validator specific ones, can be used. The simple reason is that these constraints are missing java.lang.annotation.ElementType.TYPE_USE in their definition and it cannot be added in a backwards compatible way. At the moment we have not yet decided what to do. Should we make Java 8 a requirement for Validator 5.2 or should we somehow provide JVM specific artifacts? What do you think? Right now we want to keep the options open and see which path Bean Validation 1.2 and other Java EE 8 standards are taking. For now this feature is limited to custom constraints where you can add the required ElementType yourself.

Last but not least, in the Java 8 driven feature list, is ReflectionParameterNameProvider. This new ParameterNameProvider makes use of enhancements in the Java 8 reflection API and reports actual parameter names instead of the generic arg0, arg1, etc. A requirement for this provider to work is that the sources are compiled with the -parameters compiler option. Refer to the docs to see how to configure a custom ParameterNameProvider.

What else?

Here are a couple of more highlights from this release:

ConstraintDefinitionContributor and ServiceLoader for constraint definitions

The Bean Bean Validation specification allows to register new constraint definitions via XML mapping files. For example:

<constraint-definition annotation="org.hibernate.validator.constraints.URL">
  <validated-by include-existing-validators="false">

We offer now two more ways of contributing constraint definitions. The first is programmatically via the ConstraintDefinitionContributor SPI. The above example would look like:

HibernateValidatorConfiguration configuration = Validation
	.byProvider( HibernateValidator.class )

	new ConstraintDefinitionContributor() {
		public void collectConstraintDefinitions(ConstraintDefinitionBuilder builder) {
			builder.constraint( URL.class )
				.includeExistingValidators( false )
				.validatedBy( RegexpURLValidator.class );

By the way, org.hibernate.validator.constraintvalidators.RegexpURLValidator is not a made up class. It is another new feature (HV-920) which allows to configure a regular expression based validator for the @URL constraint.

Back to constraint definition though. The second way to contribute constraint definitions is via the Java ServiceLoader mechanism. Just add META-INF/services/javax.validation.ConstraintValidator to your artifact listing the fully qualified classnames of your constraint validator classes (one per line). This mechanism works fine for adding constraint definitions for new types. You cannot as possible in XML or via the ConstraintDefinitionContributor disable default definitions.


Hibernate Validator requires per default an implementation of the Unified EL to be available. For environments where you cannot or do not want to provide an EL implementation, we offer now a non EL based message interpolator - org.hibernate.validator.messageinterpolation.ParameterMessageInterpolator.

Warning: Constraint messages containing EL expressions will be returned un-interpolated!

These were just the highlights. In total a whopping 40 issues got resolved. Be one of the early adopters and get the Maven artifacts from the JBoss Maven repository (GAV org.hibernate:hibernate-validator:5.2.Alpha1) or the SourceForge distribution bundles.

Simultaneously with the 5.2 alpha release we published a 5.1 maintenance release. We accidentally broke Java 6 backwards compatibility in 5.1.2.Final by using Collections#emptyIterator(). This is corrected in 5.1.3.Final and Java 6 compatibility is restored.

The second bug fixed in 5.1.3.Final is HV-930 where constraints were not validated when the internal weak reference cache of Hibernate Validator got partly invalidated due to memory pressure.

The full 5.1.3.Final change log can be found here. Maven artifacts are on the JBoss Maven repository under the GAV org.hibernate:hibernate-validator:5.1.3.Final and distribution bundles are available on SourceForge.

If you are using a 5.1 version of Validator it is highly recommended to upgrade to 5.1.3.Final. Or why not giving the 5.2 Alpha version a go?

Feedback and questions are welcome via the Hibernate Validator forum or on stackoverflow using the hibernate-validator tag.


It’s my great pleasure to announce the release of Hibernate OGM 4.1.0.Beta7! The release brings support for MongoDB’s object id, a clarification of what are our public API/SPI packages as well as several bugfixes and many other improvements.

Use the following GAV coordinates with tools such as Maven, Gradle etc.:

  • org.hibernate.ogm:hibernate-ogm-core:4.1.0.Beta7 for the Hibernate OGM engine and
  • org.hibernate.ogm:hibernate-ogm-<%DATASTORE%>:4.1.0.Beta7, depending on the backend you want to use.

Alternatively, there is a release bundle containing Hibernate OGM and all its dependencies available for download from SourceForge.

Support for MongoDB’s object id

When talking about Hibernate OGM, one of the most requested features we heard was support for the native object id type in MongoDB. Finally we got around to implementing this feature.

You can map object ids either directly via MongoDB’s org.bson.types.ObjectId type or using a String. The following shows an example:

public class GolfPlayer {

	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Type(type = "objectid")
	private String id;

	// Alternatively, the following could be used:
	// @Id
	// @GeneratedValue(strategy = GenerationType.IDENTITY)
	// private ObjectId id;

	private String name;

	private double handicap;


The @GeneratedValue annotation causes the id to be automatically generated by MongoDB upon insertion of the entity, similar to e.g. AUTO_INCREMENT columns in MySQL. The @Type annotation makes sure the string is mapped as an object id rather than as plain string. So a GolfPlayer document could e.g. look like this:

    "_id" : ObjectId("542ac33630043ffe5bcb4efa"),
    "name" : "Alexis",
    "handicap" : 9.7

Also related to MongoDB is a nice improvement around JP-QL queries. You can now refer to properties of embeddable objects in your queries:

@NamedQuery(name = “PersonsByCity”, query = "FROM Person p WHERE = :pCity")
public class Person {

	private ObjectId id;

	private Address address;

	// ...

Here, the named query refers to the city property of the embedded address object.

API/SPI package restructuring

As we’re on our road to the 4.1.0.Final release, we spent a fair amount of time for clearly separating the OGM code base into API, SPI and internal packages. Our goal is to make clear what is supported in the long term and what is not.

API packages (application programming interface) are all those packages which are intended to be accessed by users of Hibernate OGM, i.e. people building applications on top of it. Any package which does not have “spi” or “impl” in its name is an API package. Note that there are only very few API packages in Hibernate OGM. Most of the time you will work with the JPA (javax.persistence.* packages) or the “classic” API from Hibernate ORM.

SPI packages (service provider interface) are packages which contain contracts to be used and/or implemented by authors of custom grid dialects. So if for instance you would write a dialect for your favorite NoSQL store (btw. you should consider to contribute it to OGM), then you would access the SPI packages. They have a “spi” in their name. In order to clearly separate API and SPI, we had to rename several packages and move some types around. So existing custom dialects need to be adapted to this new structure. Good news is that it basically is enough to do a “re-organize imports” in your favorite IDE to adapt to most of the changes. We aim at a stable SPI (and of course API as well) with the 4.1 Final release.

Finally, there are internal packages of the Hibernate OGM engine which are not intended for usage by users nor dialect implementors. You can recognize those by the “impl” in their name. Internal packages and types may be changed, removed etc. without notice. So if you think there is a specific internal type which you need to access, please let us know so we can decide what to do and e.g. promote it to API or SPI.

Please refer to the migration notes to learn more about the package changes in this release.

Useful links

As always we’re very interested in your feedback. Here are some helpful links for you:

So give it a try and let us know how you like this release!

In a yet unforseen pace we have a new episode for you.

In #36 we are talking with Randall Hauch and Horia Chiorean about the ModeShape project.

As always find it all in the Show notes and episode.

Have fun!

This time around we are talking with David Jorm and Arun B. Neelicattu about Security, especially around Java.

We get to hear about how climate change helped improve JBoss, all about the secret societies surrounding security and how all software is basically doomed - but also learn how you can improve security for your framework(s) and application(s).

Listen in if you care about security and want to learn more, but also if you don't think you care - you might learn a few things. I know I did. Show notes and episode

Have fun!

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