Thank for you answers, so a usage of fragments failes.... I realy reluctant would create n (dbms) * m (jpa provider) * k (log level) * etc.... times bundles, with the same classes and just deversity persistence.xml. Do you have a best practice for me how to reference a persistence.xml (or just the provider specific properties) which is not part of my persistence bundle? Maybe using a selfwritten org.apache.aries.jpa.container.ManagedPersistenceUnitInfoFactory which has preconfigured properties/settings for a specific persistence unit and merges them?
Regards, Marcel 2011/6/20 Timothy Ward <timothyjw...@apache.org>: > Hi, > > There is another much more important reason to use getEntry, the JPA > container processes persistence bundles as they are installed to prevent any > classes being able to be loaded before the metadata can be parsed. We then > immediately create an EntityManagerFactory as the bundle resolves. If any > classes were to be loaded before we created the EntityManagerFactory then it > would not be possible to load-time enhance the entity classes. > > Unfortunately there are no fragments attached when the bundle is in the > INSTALLED state. Using getResource() would cause the bundle to move to > RESOLVED which we don't want either. > > Regards, > > Tim > >> Subject: Re: Attaching jpa persistence.xml via fragments to a persistence >> bundle >> From: n...@apache.org >> Date: Mon, 20 Jun 2011 09:05:29 +0100 >> To: user@aries.apache.org >> >> Hi, >> >> getResource does something very different from getEntry. getResource uses >> the Bundle-Classpath so it doesn't guarantee to return >> META-INF/persistence.xml rooted in the bundle. That is why getResource is >> not used. >> >> I don't know why fragments aren't processed, other people in the list can, >> I'm sure, explain why. >> >> Alasdair Nottingham >> >> On 20 Jun 2011, at 07:56, Marcel Hanser >> <marcel.hanser.w...@googlemail.com> wrote: >> >> > Hi, >> > >> > i would like to attach a persistence.xml, or more percise parts of it, >> > to my jpa persistence bundle, since the concrete provider and DBMS >> > configuration should be chooseable without modify the persistence >> > bundle. >> > I scanned a the aries jpa code and found the >> > org.apache.aries.jpa.container.ManagedPersistenceUnitInfoFactory >> > plug-in point and also the >> > >> > org.apache.aries.jpa.container.impl.PersistenceBundleHelper.locateFile(Bundle, >> > String) method. And now im wondering why using bundle.getEntry(String) >> > instead of bundle.getResource(String). Since fragments are not scanned >> > when using bundle.getEntry(String). >> > So is there already a way for doing that and i just missed it? >> > >> > Thanks in advance. >> > >> > Marcel Hanser >
