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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 Tools Demo at EclipseCon
I'll be demo'ing Hibernate Tools at EclipseCon on March 21st. See details here .
Thomas has posted a movie demonstrating the use of Hibernate Tools (part of JBoss IDE) to reverse engineer an entire runnable Seam application from an existing database.
Seam 1.0 beta 2
Seam 1.0 beta 2 has been released:
A story about FreeMarker and Velocity
I have been fed up with Velocity ís ability to ignore and even hide errors and exceptions occurring in the templates used in Hibernate Tools .
Hibernate Tools 3.1 Beta 4 released
A new updated version of the Hibernate Tools (http://tools.hibernate.org) project have been made available.
Persistent collections are a feature!
In the past few months I got the impression that something in our explanation of object/relational mapping has gone a little wrong. I'm still not sure that this is the fault of any documentation or presentation slide, it's just something that naturally happened...
I found a posting from Emmanuel with the following link to the JDK bug tracking system .
The Hibernate team is please to announce Hibernate EntityManager 3.1beta6 and Hibernate Annotations 3.1beta8, a compliant implementation of the latest and greatest EJB3 Proposed Final Draft.
Hibernate 3.1.1 released
Hibernate 3.1.1 has been released earlier this week. This maintenance release focused on bugfixes and improvements, especially regarding:
