Re: EJB Transaction

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> >Considering the above scenario, will all the method calls=20
> above falls into 1 transaction?=20
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 No each thread from servlet is different transaction=2E So in=20
 this case with required attribute two different transactions=20
 run one after another
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> >Is rollback possible in this scenario?
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Yes, its upto you how you handle it=2E If System exception is=20
thrown, transaction will be rolled back automatically by=20
container in each flow you mentioned=2E So its upto you if you=20
want to continue to next call
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> >If the ear is deployed into the same application server, even to=20
> >different container (serlvet deployed to servlet >>>>=20
> container, EJBs deployed to EJB container), are the objects=20
> sharing the same JVM?
 Cannot say, but its always suggested not to assume such=20
 things while coding=2E Why do you want to know?=20
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> >I have read about EJB transactions, but the information that I found=20
> >are mainly for EJB to local/remote EJB kind, is > there any=20
> information=20
> >that you can recommend me to read about transaction=20
> behaviour that relates to EJB to POJO or vice versa?
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 Pojo calls are equivalent to normal method calls=2E So in your=20
 case it doesn't matter if you use POJOs or not unless you are=20
 not doing any thing special like starting some transaction etc=2E=20
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 /Ashwani
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> ________________________________
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> From: A mailing list for Enterprise JavaBeans development=20
> [mailto:EJB-INTEREST@JAVA=2ESUN=2ECOM] On Behalf Of Karen Low
> Sent: Wednesday, August 16, 2006 8:27 AM
> To: EJB-INTEREST@JAVA=2ESUN=2ECOM
> Subject: EJB Transaction
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> Hi,
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> I was trying to find out what will be the transaction like=20
> for the following scenario:
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> Imagine a servlet method get invokes and it's a deep request=20
> which does 2 db calls, one is insert, another one is update=2E=20
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> Action class (Servlet):
>      ---> Stateless Session Bean (1)  ---> POJO --->=20
> Stateless Session Bean (2) ---> POJO (DAO) =3D=3D> DB (insert)
>      ---> Stateless Session Bean (1)  ---> POJO --->=20
> Stateless Session Bean (2) ---> POJO (DAO) =3D=3D> DB (update)=20
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> Legend:=20
> ---> calls a method
> =3D=3D> DB sql execution
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> All EJBs are container managed with transaction attribute set=20
> to "Required"=2E All classes mentioned above are packaged into=20
> one ear and deployed into 1 app server=2E=20
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> Considering the above scenario, will all the method calls=20
> above falls into 1 transaction? Is rollback possible in this=20
> scenario? Are they consider in the same session? If the ear=20
> is deployed into the same application server, even to=20
> different container (serlvet deployed to servlet container,=20
> EJBs deployed to EJB container), are the objects sharing the=20
> same JVM?=20
>=20
> I have read about EJB transactions, but the information that=20
> I found are mainly for EJB to local/remote EJB kind, is there=20
> any information that you can recommend me to read about=20
> transaction behaviour that relates to EJB to POJO or vice versa?=20
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> Any thoughts and experience shared are much appreciated=2E
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> Thank you very much=2E
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> Regards,
> Karen
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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