There's been plenty of discussion in the JPA group about my typesafe criteria proposal. My new favorite feature of the Java language is javax.annotation.Processor. Java 6 annotation processors are derived from the APT tool that existed in JDK 5, but are built into javac. Really, the name annotation processor is misleading, since this feature is only incidentally related to annotations. The Processor is really a fairly general purpose compiler plugin. If, like me, you've never been a fan of code generation, now is the time to reconsider. A Java 6 Processor can:
The public draft of the JPA 2.0 specification is already out and includes a much-awaited feature: an API that lets you create queries by calling methods of Java objects, instead of by embedding JPA-QL into strings that are parsed by the JPA implementation. You can learn more about the API proposed by the public draft at Linda's blog.
I am please to announce the GA release of Hibernate Search 3.1. This release focuses on performance improvement and code robustness but also add interesting new features focused on usability:
If there's one thing that we really want to get right as Web Beans goes from Public Draft to Proposed Final draft, it's integration with the Java EE platform. Up to this point, most of the work we've been doing as an EG was focused on nailing down the programming model, the semantics of the Web Beans services, and the behavior of the Web Bean manager. We've been writing the spec to assume that Web Beans implementations should be pluggable between different Java EE containers, because this is a direction that a lot of folks in the Java EE community believe that the EE platform should move in, and because we would like Web Beans to help show the way for other specifications such as EJB, JTA and perhaps even Servlets (note that JPA and JSF already support this).
Hibernate Search 3.0.0.Beta2 is out with a bunch of new interesting features:
Happy Birthday Hibernate! Now that the first copies of Java Persistence with Hibernate are shipping (still waiting for mine though), the first people who should get one are Hibernate contributors. Manning Publications sponsors 25 copies of the book, and we'll distribute them in exchange for 25 Hibernate forum credits. See this page for details.
The Hibernate developer team released Hibernate 3.2.0 GA today, this release is now ready for production use. Please read the migration guidelines if you are upgrading from an earlier version.
People using the Criteria API have either transparently or knowingly used a ResultTransformer . A ResultTransformer is a nice and simple interface that allows you to transform any Criteria result element. E.g. you can make any Criteria result be returned as a java.util.Map or as a non-entity Bean.
A bug report was recently
opened in Hibernate's JIRA stating that Hibernate incorrectly handles deadlock scenarios.
The basis for the report was an example in the /Pro Hibernate 3/ book (Chapter 9). For
those perhaps not familiar with the term
deadlock, the basic gist is that two processes
each hold resource locks that the other needs to complete processing. While this phenomena
is not restricted to databases, in database terms the idea is that the first process (P1)
holds a write lock on a given row (R1) while the second process (P2) holds a write lock on
another row (R2). Now, to complete its processing P1 needs to
acquire a write lock on R2, but cannot do so because P2 already holds its write lock.
Conversely, P2 needs to acquire a write lock on R1 in order to complete its processing,
but cannot because P1 already holds its write lock. So neither P1 nor P2 can complete
its processing because each is indefinitely waiting on the other to release the needed
lock, which neither can do until its processing is complete. The two processes are said
to be deadlocked in this situation.
Hibernate 3.1.1 has been released earlier this week. This maintenance release focused on bugfixes and improvements, especially regarding: