On 25. juni 2010, at 17.53, Scott Ferguson wrote:
> Do you have any idea why the default would be working differently on
> Resin? That library code shouldn't be directly dependent on Resin (we
> don't provide anything like a TraversableResolver), but it's possible
> that some classloader methods like ClassLoader.getResource are behaving
> differently.
Hi!
Thanks for asking :)
The TraversableResolver.isReachable has the following javadoc:
"Determine if the Bean Validation provider is allowed to reach the property
state"
The default validation.xml which comes with HibernateValidator 4.0.2 contains
the following line:
<traversable-resolver>org.hibernate.validator.engine.resolver.DefaultTraversableResolver</traversable-resolver>
and this class has the following method:
public boolean isReachable(Object traversableObject, Path.Node
traversableProperty, Class<?> rootBeanType, Path pathToTraversableObject,
ElementType elementType) {
return jpaTraversableResolver == null ||
jpaTraversableResolver.isReachable(
traversableObject, traversableProperty,
rootBeanType, pathToTraversableObject, elementType
);
}
You can find the full sourcecode of this class at http://bit.ly/bnQId6 and see
how it obtains its jpaTraversableResolver.
So, when running under jetty jpaTraversableResolver is null and isReachable is
returning true and we get all our attributes validated. Good :)
But... now I come to the part where I'm mostly guessing, when running under
resin we have a jpaTraversableResolver in which isReachable seems to return
false which cause our attributes to not get validated.
We are not using JPA in the application I'm working on now, but still when
running under resin we have a javax.persistence.PersistenceUtil class in the
classpath and DefaultTraversableResolver thinks we are running JPA.
We have another project which uses JPA and it seems to have the same problem
with not getting attributes validated. When DefaultTraversableResolver thinks
we are using JPA it delegates to
org.hibernate.validator.engine.resolver.JPATraversableResolver to check if an
object is reachable. It seems to be something strange in the way
JPATraversableResolver figures out if attributes is reachable or not since we
don't get our attributes validated even in projects using JPA.
JPATraversableResolver uses the following code:
public boolean isReachable(Object traversableObject, Path.Node
traversableProperty, Class<?> rootBeanType, Path pathToTraversableObject,
ElementType elementType) {
return traversableObject == null ||
Persistence.getPersistenceUtil().isLoaded(
traversableObject, traversableProperty.getName() );
}
(from http://bit.ly/apHvnZ)
Since my project does not use JPA and the workaround with adding our own
TraversableResolver implementation to our validation.xml files solves this
issue for us, I haven't does any more digging into this.
I guess there is two possible problems here:
1) DefaultTraversableResolver should have had a better way of detecting if we
use JPA or not (other than looking for avax.persistence.PersistenceUtil in the
classpath).
2) In our projects using JPA the JPATraversableResolver.isReachable is
returning false when it shouldn't. That might be a configuration or other
problem on our side since this seems to work ok for others out there.
Anyway... both issues are related to HibernateValidator and we have a
workaround for our issue. Great! ;-)
-Kaj :)
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