OK, so this is probably another Hibernate issue, but still. I'm building my
Seam app from the Seam Hibernate example under Tomcat alone (microcontainer,
yada yada). I'm trying to declare a @PreUpdate method to protect certain
objects from updates (by throwing an exception and killing the session). But
my method is never called.
Code:
@Entity
| @Inheritance(strategy=InheritanceType.JOINED)
| public class RepObject {
| ...
| private Changeset replicatedChangeset;
|
| /**
| * The changeset in which this object was created. Null for head
objects; set for all
| * versioned copies.
| */
| @ManyToOne
| public Changeset getReplicatedChangeset ()
| {
| return replicatedChangeset;
| }
| ...
| @PreUpdate
| private void checkUpdate () {
| log.debug("Calling checkUpdate on " + this + "...");
| if (replicatedChangeset != null) {
| throw new IllegalStateException("Can't update snapshotted object "
+ this);
| }
| }
The idea is that a RepObject can be copied, and the copy has a non-null
"Changeset". The copy then should never ever be updated again. Basically I
want it to be "dynamically immutable" (I wish there was a way to flag a
particular object as immutable at the Hibernate level, but the best I can do is
blow up if you change it and then try to flush).
The test is this. (BlogPostImpl is of course a subclass of RepObject.)
database.enableFilter("priorVersion").setParameter("version",
last.getId());
| List<BlogPostImpl> priorBlogPosts = database.createQuery("from
BlogPostImpl").list();
|
| try {
| BlogPost prior1 = priorBlogPosts.get(0);
| prior1.setTitle("changedTitle");
|
| // this should call the @PreUpdate on RepObject, which
should blow up here
| // ... but doesn't! and I can't even see where the
@PreUpdate gets read!
| database.flush();
|
| // assert false; // plan to die if we get this far; should
get exception from the flush
| } catch (Exception e) {
| // you should never do this, so we don't attempt to support
any sort of recovery!
| log.info("Got expected exception from attempted snapshot
update", e);
| }
But my @PreUpdate method is never called, no exception gets thrown, and I hit
the "assert false". And I can see in the log output that the flush *is*
causing a single update:
DEBUG 06-07 08:49:12,353 (Log4JLogger.java:debug:84) -Flushed: 0 insertions, 1
updates, 0 deletions to 4 objects
| ... DEBUG 06-07 08:49:12,393 (Log4JLogger.java:debug:84) -update RepObject
set version=?, replicatedChangeset_id=?, replicatedKey=? where id=? and
version=?
| ... DEBUG 06-07 08:49:12,433 (Log4JLogger.java:debug:84) -update
BlogPostImpl set content=?, title=? where repobject_id=?
In digging through hibernate-annotations source, I can't see where
AnnotationBinder ever looks at the Entity methods to see which of them are
flagged with EJB3 callbacks! I would like to trace through the code that sets
up the callbacks on this Entity, but I can't find it to trace through!
What am I missing? Can anyone confirm or disconfirm that EJB3 persistence
lifecycle annotations actually work with Seam @Entities? I will also post this
in the Hibernate EJB3 forum....
Cheers,
Rob
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