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Re: [eclipselink-users] Error writing collection of entities to the database

Hi Tim and Tom
 
Thanks for the replies. I see "batch reading" and do not find anything about on "batch updating" or "batch writing" in the wiki search. Can you help me with that?
 
 
Thanks
Kris

f u cn rd ths, u cn gt a gd jb n cmptr prgrmmng

--- On Wed, 1/21/09, Tim Hollosy <hollosyt@xxxxxxxxx> wrote:
From: Tim Hollosy <hollosyt@xxxxxxxxx>
Subject: Re: [eclipselink-users] Error writing collection of entities to the database
To: krisusa123@xxxxxxxxx, "EclipseLink User Discussions" <eclipselink-users@xxxxxxxxxxx>
Date: Wednesday, January 21, 2009, 12:29 PM

Yes, it's called batch updating. Check the wiki.

./tch



On Wed, Jan 21, 2009 at 11:43 AM, krisusa123 <krisusa123@xxxxxxxxx>
wrote:
> Hi Tom
> Thanks for the reply. But, thats too much of I/O where it commits row by
row
> rather than commiting a collection. I do understand that it needs to check
> referential integrity and database constraints.
>
> Is there any way out of this?
>
> Thanks
> kris
>
> f u cn rd ths, u cn gt a gd jb n cmptr prgrmmng
>
> --- On Wed, 1/21/09, Tom Ware <tom.ware@xxxxxxxxxx> wrote:
>
> From: Tom Ware <tom.ware@xxxxxxxxxx>
> Subject: Re: [eclipselink-users] Error writing collection of entities to
the
> database
> To: krisusa123@xxxxxxxxx, "EclipseLink User Discussions"
> <eclipselink-users@xxxxxxxxxxx>
> Date: Wednesday, January 21, 2009, 7:53 AM
>
> Hi Kris,
>
>   The code that uses UnitOfWork is not JPA code.  UnitOfWork is an
> EclipseLink
> class and not necessary when using pure JPA.  Is there any particular
reason
> you
> have written that code?
>
>   The rest of the code uses JPA APIs.
>
>   The problem you are seeing is because you are trying to persist your
array
> of
> TestEtl as a whole instead of individually.   You can only call persist on
> classes that are persistent.  List is not a persistent class.  The classes
> stored in your list are the classes you want to persist.
>
>   You should write code that iterates through your list and persists each
> element individually.
>
> -Tom
>
> krisusa123 wrote:
>> Hello Guys
>> Now I have a new problem with my pure JPA implementation.
>> I am trying to commit a collection (ArrayList of entity objects)
rather
> than an entity object and here is the error I am getting. Can I do this or
> is it
> wrong?
>>  Code also attached below.
>>  Appreciate your help.
>>  Exception in thread "main"
> _java.lang.IllegalArgumentException_: Object:
> [com..entities.TestEtl@1da669c,
> com.entities.TestEtl@186c730 <mailto:com.entities.TestEtl@186c730>,
> com.entities.TestEtl@17f242c <mailto:com.entities.TestEtl@17f242c>]
is not
> a known entity type.
>>  * *
>> *public* *static* *boolean* saveData(EntityManagerFactory emf,
> List<xx> Beans ) {
>>
>> EntityManager entityManager = emf.createEntityManager();
>>
>> UnitOfWork uow = ((EntityManagerImpl) entityManager).getUnitOfWork();
>>
>> List<TestEtl> lm = *new* ArrayList<TestEtl>();
>>
>> uow.registerAllObjects(lm);
>> * *
>>
>> *try* {
>>
>> *for* (*int* i=0; i< Beans.size(); i++) {
>>
>> TestEtl load = *new* TestEtl();
>>
>> load.setCol1(Beans.get(i).getCol1());
>>
>> load.setCol2(Beans.get(i).getCol2());
>> lm.add(load);
>>
>> } *catch* (Exception e) {
>>
>> System./out/.println( "Error::" + e);
>>
>> *return* *false*;
>>
>> } *finally* {
>>
>> entityManager.persist(lm);
>>
>> uow.commit();
>>
>> entityManager.close();
>>
>> emf.close();
>> }**
>>
>> *return* *true*;
>>
>> }
>>
>> f u cn rd ths, u cn gt a gd jb n cmptr prgrmmng
>>
>> --- On *Tue, 1/20/09, krisusa123 /<krisusa123@xxxxxxxxx>/*
wrote:
>>
>>     From: krisusa123 <krisusa123@xxxxxxxxx>
>>     Subject: Re: [eclipselink-users] How to create EclipseLink
Sessions,
>>     ORM.xml files in J2SE environment
>>     To: "EclipseLink User Discussions"
> <eclipselink-users@xxxxxxxxxxx>
>>     Date: Tuesday, January 20, 2009, 10:11 AM
>>
>>     Hi Tim
>>     What you said was pretty much true until yesterday. I had got
>>     confused between pure JPA solution and EclipseLink specific
>>     implementation.
>>          But now, I have got the pure JPA solution working. Thanks to
you
> for
>>     helping me finish that part.
>>          Then I started trying to accomplish the same thing using
> EclipseLink
>>     only API by using sessions.xml and stuff.
>>          I am trying to understand how to get the second one
(EclipseLink
>>     specific one) working. Thats where I got this exception:
>>          Exception Description: Missing descriptor for [class
> com.xx.TestEtl].
>>     Verify that the descriptor has been properly registered with the
>>     Session.
>>
>>
>>     f u cn rd ths, u cn gt a gd jb n cmptr prgrmmng
>>
>>     --- On *Tue, 1/20/09, Tim Hollosy /<hollosyt@xxxxxxxxx>/*
wrote:
>>
>>         From: Tim Hollosy <hollosyt@xxxxxxxxx>
>>         Subject: Re: [eclipselink-users] How to create EclipseLink
>>         Sessions, ORM.xml files in J2SE environment
>>         To: "EclipseLink User Discussions"
> <eclipselink-users@xxxxxxxxxxx>
>>         Date: Tuesday, January 20, 2009, 9:27 AM
>>
>>         Also be aware, the example on my blog uses a pure JPA approach
>>         (mostly) the only native class I use is UnitOfWork. I think
Kris
> is
>>         kind of confused between the two. But just bare in mind, if
> you're
>>         following my example/my code make sure you realize you're
> working in a
>>         Pure JPA environment.
>>
>>         ./tch
>>
>>
>>
>>         On Tue, Jan 20, 2009 at 9:06 AM, Tom Ware
> <tom.ware@xxxxxxxxxx> wrote:
>>         > Hi Kris,
>>         >
>>         >  This error generally occurs because for some reason the
> metadata for your
>>         > TestEtl class is not available to EclipseLink and you are
> treating it as
>>         > persistent.
>>         >
>>         >  Depending on how you are configured, the metadata can
come
> from different
>>         > places.
>>         >
>>         >  If you are using a pure JPA solution, it will be derived
> from
>>         Annotations,
>>         > orm.xml and your persistence.xml file.
>>         >
>>         >  If you are using the EclipseLink-proprietary APIs, it
will
> be derived
>>         from
>>         > your sessions.xml and from either your project class or
your
> deployment
>>         > xml(generated with the EclipseLink Mapping Workbench)
>>         >
>>         >  Perhaps you can explain a little more about which of
these
> files you are
>>         > using and what you are doing when you see the error.
>>         >
>>         > -Tom
>>         >
>>         > krisUSA123 wrote:
>>         >>
>>         >> Based on EclipseTeam's suggestions, I was able to
> create
>>         sessions.xml file
>>         >> and was trying to create a CRUD operation.
>>         >> May I know what this error means:
>>         >>
>>         >> Exception Description: Missing descriptor for [class
> com.xx.TestEtl].
>>         >> Verify that the descriptor has been properly
registered
> with the
>>         Session.
>>         >>
>>         >> How do I fix it?
>>         >>
>>         >> Appreciate your help.
>>         >> Thanks guys for being responsive to my earlier post.
>>         >>
>>         >> Thanks
>>         >> Kris
>>         >
>>         > _______________________________________________
>>         > eclipselink-users mailing list
>>         > eclipselink-users@xxxxxxxxxxx
>>         >
https://dev.eclipse.org/mailman/listinfo/eclipselink-users
>>         >
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>>
>>
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>>
>>
>>
>>
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>>
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