Re: AW: Synchronizing ejb method

"Kalra, Ashwani" <[email protected]> Fri, 19 May 2006 11:06:48 +0530
Newsgroups gmane.comp.java.sun.ejb.general
Message-ID <1B0CECCD25CA24499E03717EF3D503F10273CA41@BOMEX001.corp.capgemini.com>
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You are right John, It just got out of my mind that batch process is not a=
 web client=2E
=20
Thanks
Ashwani

________________________________

From: Johan Eltes [mailto:johan=2Eeltes@callista=2Ese]=20
Sent: Friday, May 19, 2006 11:03 AM
To: Kalra, Ashwani
Cc: EJB-INTEREST@JAVA=2ESUN=2ECOM
Subject: Re: AW: Synchronizing ejb method


I don't think the batch and the clients will get th same session id=2E=
 That's the whole idea of stateful session beans - that each client gets=
 its own instance and that the instance has affinity for requests from its=
 owning "user" during the lifetime of the users session=2E I would=
 recommend application-controlled database state management for locking out=
 one type of client from the other (with stateless session bean)=2E=20

/Johan

19 maj 2006 kl=2E 06=2E15 skrev Kalra, Ashwani:


        No its not correct=2E=20
        Section 7=2E5=2E8 , Ejb 2=2E1
        =20
        "Clients are not allowed to make concurrent calls to a stateful session=
 object=2E If a client-invoked business

        method is in progress on an instance when another client-invoked call,=
 from the same or different client,

        arrives at the same instance of a stateful session bean class, the=
 container may throw the

        java=2Ermi=2ERemoteException to the second client[7] if the client is a=
 remote client, or the

        javax=2Eejb=2EEJBException if the client is a local client=2E This=
 restriction does not apply to a stateless

        session bean because the container routes each request to a different=
 instance of the session bean

        class=2E"

        I think there is no standard approach as Andreas said=2E My problem is=
 that there is some batch process running and there is jsp page that can=
 access the same method of ejb which I wanted to avoid=2E I think I can use=
 statefull session bean so that at least second client gets the exception=
=2E

=09
        =20

        Thanks

        Ashwani

=09
        =20
=09
        =20

________________________________

        From: A mailing list for Enterprise JavaBeans development=
 [mailto:EJB-INTEREST@JAVA=2ESUN=2ECOM] On Behalf Of Tareq Ayub
        Sent: Friday, May 19, 2006 7:55 AM
        To: EJB-INTEREST@JAVA=2ESUN=2ECOM
        Subject: Re: AW: Synchronizing ejb method
=09
=09
        Refer to the EJB spec=2E The container will not allow multiple threads to=
 use the same instance of an SLSB=2E From the spec - "The container must=
 ensure that only one thread can be executing an instance at any time"=2E=
 Given that, why would you want to synchronize on an EJB method anyways ?=
 Also, SLSB have no state (no instance variables)=2E  The same principle=
 applies to SFSB in addition to the fact an instance is tied to a single=
 client=2E=20

        Tareq=20
=09
=09
        On May 15, 2006, at 2:40 AM, Andreas Berg wrote:


                You shouldn't=2E The only reason to synchronize a stateless session bean=
 is if your bean is not stateless=2E Then ask yourself why you chose a=
 stateless bean for some stateful purpose=2E
                =20
                If you really want to synchronize your SLSB you need to think about the=
 runtime environment=2E If all the instances of the SLSB run in a single=
 JVM, you can use the standard Java synchronization features inside the=
 bean to synchronize=2E But this doesn't work with a clustered environment=
=2E AFAIK there is no standard approach to solve this=2E
                =20
                Kind regards,
                =20
                Andreas=2E
                =20
                =20
                Andreas Berg
                Zelfi AG
                Hechtsheimer Stra=DFe 33
                55131 Mainz
                Telefon: 06131-9064850
                Telefax: 06131-9064853
                andreas=2Eberg@zelfi=2Ecom
                http://www=2Ezelfi=2Ecom/
                =20

________________________________

                Von: A mailing list for Enterprise JavaBeans development=
 [mailto:EJB-INTEREST@JAVA=2ESUN=2ECOM] Im Auftrag von Kalra, Ashwani
                Gesendet: Montag, 15=2E Mai 2006 06:42
                An: EJB-INTEREST@JAVA=2ESUN=2ECOM
                Betreff: Synchronizing ejb method
        =09
        =09
                Hi,
                The client of my ejb can be an jsp or standalone java class=2E  How can I=
 synchronize access to the SLSB ejb method? I am using ejb2=2E0 version
                =20
                =20

                __________________=20
                Regards=20
                Ashwani Kalra=20
        =09

                =20
This message contains information that may be privileged or confidential=
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 you are not authorized to read, print, retain, copy, disseminate,=
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This message contains information that may be privileged or confidential=
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 "help"=2E=20





This message contains information that may be privileged or confidential=
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<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=
=3D2><SPAN=20
class=3D970323505-19052006>You are right John, It just got out of my mind=
 that=20
batch process is not a web client=2E</SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=
=3D2><SPAN=20
class=3D970323505-19052006></SPAN></FONT>&nbsp;</DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=
=3D2><SPAN=20
class=3D970323505-19052006>Thanks</SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=
=3D2><SPAN=20
class=3D970323505-19052006></SPAN></FONT><FONT face=3DArial color=3D#0000ff=
=20
size=3D2><SPAN class=3D970323505-19052006>Ashwani</SPAN></FONT></DIV><BR>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> Johan Eltes=20
[mailto:johan=2Eeltes@callista=2Ese] <BR><B>Sent:</B> Friday, May 19, 2006=
 11:03=20
AM<BR><B>To:</B> Kalra, Ashwani<BR><B>Cc:</B>=20
EJB-INTEREST@JAVA=2ESUN=2ECOM<BR><B>Subject:</B> Re: AW: Synchronizing ejb=
=20
method<BR></FONT><BR></DIV>
<DIV></DIV>I don't think the batch and the clients will get th same session=
 id=2E=20
That's the whole idea of stateful session beans - that each client gets its=
 own=20
instance and that the instance has affinity for requests from its owning=
 "user"=20
during the lifetime of the users session=2E I would recommend=20
application-controlled database state management for locking out one type=
 of=20
client from the other (with stateless session bean)=2E
<DIV><BR class=3Dkhtml-block-placeholder></DIV>
<DIV>/Johan</DIV>
<DIV><BR>
<DIV>
<DIV>19 maj 2006 kl=2E 06=2E15 skrev Kalra, Ashwani:</DIV><BR=20
class=3DApple-interchange-newline>
<BLOCKQUOTE type=3D"cite">
  <DIV dir=3Dltr align=3Dleft><SPAN class=3D734250804-19052006><FONT face=
=3DArial=20
  color=3D#0000ff size=3D2>No its not correct=2E </FONT></SPAN></DIV>
  <DIV dir=3Dltr align=3Dleft><SPAN class=3D734250804-19052006><FONT face=
=3DArial=20
  color=3D#0000ff size=3D2>Section 7=2E5=2E8 , Ejb 2=
=2E1</FONT></SPAN></DIV>
  <DIV dir=3Dltr align=3Dleft><SPAN class=3D734250804-19052006><FONT face=
=3DArial=20
  color=3D#0000ff size=3D2></FONT></SPAN>&nbsp;</DIV>
  <DIV dir=3Dltr align=3Dleft><SPAN class=3D734250804-19052006><FONT size=
=3D2><SPAN=20
  class=3D734250804-19052006>"</SPAN>Clients are not allowed to make=
 concurrent=20
  calls to a <STRONG>stateful session object</STRONG>=2E If a=
 client-invoked=20
  business</FONT></SPAN></DIV>
  <DIV dir=3Dltr align=3Dleft>
  <P align=3Dleft><FONT size=3D2>method is in progress on an instance when=
 another=20
  client-invoked call, from the same or different client,</FONT></P>
  <P align=3Dleft><FONT size=3D2>arrives at the same instance of a stateful=
 session=20
  bean class, the container may throw the</FONT></P><FONT face=3DCourier=20
  size=3D2></FONT>
  <P align=3Dleft><FONT face=3DCourier size=3D2>java=2Ermi=
=2ERemoteException </FONT><FONT=20
  face=3D"Times New Roman" size=3D2>to the second client</FONT><FONT=20
  face=3D"Times New Roman" size=3D1>[7] </FONT><FONT face=3D"Times New=
 Roman"=20
  size=3D2>if the client is a remote client, or the</FONT></P><FONT=20
  face=3D"Times New Roman" size=3D2></FONT><FONT face=3DCourier size=
=3D2></FONT>
  <P align=3Dleft><FONT face=3DCourier size=3D2>javax=2Eejb=2EEJBException=
 </FONT><FONT=20
  size=3D2>if the client is a local client=2E This restriction does not=
 apply to a=20
  stateless</FONT></P>
  <P align=3Dleft><FONT size=3D2>session bean because the container routes=
 each=20
  request to a different instance of the session bean</FONT></P>
  <P align=3Dleft><FONT size=3D2>class=2E<SPAN=20
  class=3D734250804-19052006>"</SPAN></FONT></P>
  <P align=3Dleft><SPAN class=3D734250804-19052006><FONT size=3D2><FONT=
 face=3DArial=20
  color=3D#0000ff>I think there is no standard approach as Andreas said=2E=
 My=20
  problem is that there is some batch process running and there is jsp page=
 that=20
  can access the same method of ejb which I wanted to avoid</FONT>=2E <FONT=
=20
  face=3DArial color=3D#0000ff>I think I can use statefull session bean so=
 that at=20
  least second client gets the exception=2E</FONT></FONT></SPAN></P>
  <DIV><SPAN class=3D734250804-19052006><FONT face=3DArial color=3D#0000ff=
=20
  size=3D2></FONT></SPAN><BR class=3Dkhtml-block-placeholder>&nbsp;</DIV>
  <P align=3Dleft><SPAN class=3D734250804-19052006><FONT face=3DArial color=
=3D#0000ff=20
  size=3D2>Thanks</FONT></SPAN></P>
  <P align=3Dleft><SPAN class=3D734250804-19052006><FONT face=3DArial color=
=3D#0000ff=20
  size=3D2>Ashwani</FONT></SPAN></P>
  <DIV><SPAN class=3D734250804-19052006><FONT face=3DArial color=3D#0000ff=
=20
  size=3D2></FONT></SPAN><BR class=3Dkhtml-block-placeholder>&nbsp;</DIV>
  <DIV><FONT size=3D2><SPAN class=3D734250804-19052006></SPAN></FONT><BR=20
  class=3Dkhtml-block-placeholder>&nbsp;</DIV></DIV><BR>
  <DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
  <HR tabIndex=3D-1>
  <FONT face=3DTahoma size=3D2><B>From:</B> A mailing list for Enterprise=
 JavaBeans=20
  development [<A=20
  href=3D"mailto:EJB-INTEREST@JAVA=2ESUN=2ECOM">mailto:EJB-INTEREST@JAVA=
=2ESUN=2ECOM</A>]=20
  <B>On Behalf Of </B>Tareq Ayub<BR><B>Sent:</B> Friday, May 19, 2006 7:55=
=20
  AM<BR><B>To:</B> <A=20
  href=3D"mailto:EJB-INTEREST@JAVA=2ESUN=2ECOM">EJB-INTEREST@JAVA=2ESUN=
=2ECOM</A><BR><B>Subject:</B>=20
  Re: AW: Synchronizing ejb method<BR></FONT><BR></DIV>
  <DIV></DIV>Refer to the EJB spec=2E The container will not allow multiple=
=20
  threads to use the same instance of an SLSB=2E From the spec - "<FONT=20
  class=3DApple-style-span face=3DVerdana size=3D3><SPAN class=
=3DApple-style-span=20
  style=3D"FONT-SIZE: 13px">The container must ensure that only one thread=
 can be=20
  executing an instance at any time"=2E Given that, why would you want to=20
  synchronize on an EJB method anyways ? Also, SLSB have no state (no=
 instance=20
  variables)=2E&nbsp; The same principle applies to SFSB in addition to the=
 fact=20
  an instance is tied to a single client=2E</SPAN></FONT>=20
  <DIV><BR class=3Dkhtml-block-placeholder></DIV>
  <DIV><FONT class=3DApple-style-span face=3DVerdana size=3D3><SPAN=20
  class=3DApple-style-span style=3D"FONT-SIZE: 13px"></SPAN></FONT>Tareq=20
  <DIV><FONT class=3DApple-style-span face=3DVerdana size=3D3><SPAN=20
  class=3DApple-style-span style=3D"FONT-SIZE: 13px"><BR></SPAN></FONT>
  <DIV>
  <DIV>On May 15, 2006, at 2:40 AM, Andreas Berg wrote:</DIV><BR=20
  class=3DApple-interchange-newline>
  <BLOCKQUOTE type=3D"cite">
    <DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=
=3D2><SPAN=20
    class=3D265003407-15052006>You shouldn't=2E&nbsp;The only=
 reason&nbsp;to=20
    synchronize a stateless session bean is if your bean is not stateless=
=2E Then=20
    ask yourself why you chose a stateless bean for some stateful=20
    purpose=2E</SPAN></FONT></DIV>
    <DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=
=3D2><SPAN=20
    class=3D265003407-15052006></SPAN></FONT>&nbsp;</DIV>
    <DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=
=3D2><SPAN=20
    class=3D265003407-15052006>If you really want to synchronize your SLSB=
 you=20
    need to think about the runtime environment=2E If all the instances of=
 the=20
    SLSB run in a single JVM, you can use the standard Java synchronization=
=20
    features inside the bean to synchronize=2E But this doesn't work with a=
=20
    clustered environment=2E AFAIK there is no standard approach to solve=20
    this=2E</SPAN></FONT></DIV>
    <DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=
=3D2><SPAN=20
    class=3D265003407-15052006></SPAN></FONT>&nbsp;</DIV>
    <DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=
=3D2><SPAN=20
    class=3D265003407-15052006>Kind regards,</SPAN></FONT></DIV>
    <DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=
=3D2><SPAN=20
    class=3D265003407-15052006></SPAN></FONT>&nbsp;</DIV>
    <DIV dir=3Dltr align=3Dleft><FONT face=3DArial color=3D#0000ff size=
=3D2><SPAN=20
    class=3D265003407-15052006>Andreas=2E</SPAN></FONT></DIV>
    <DIV>&nbsp;</DIV>
    <DIV align=3Dleft><FONT face=3DArial color=3D#000000 size=
=3D2></FONT>&nbsp;</DIV>
    <DIV align=3Dleft><FONT face=3DArial color=3D#808000 size=3D1>Andreas=
 Berg<BR>Zelfi=20
    AG<BR>Hechtsheimer Stra=DFe 33<BR>55131 Mainz<BR>Telefon:=20
    06131-9064850<BR>Telefax:&nbsp;06131-9064853</FONT></DIV>
    <DIV align=3Dleft><FONT face=3DArial color=3D#808000 size=3D1><A=20
    href=3D"mailto:andreas=2Eberg@zelfi=2Ecom">andreas=2Eberg@zelfi=
=2Ecom</A></FONT></DIV>
    <DIV align=3Dleft><FONT face=3DArial color=3D#808000 size=3D1><A=20
    href=3D"http://www=2Ezelfi=2Ecom/">http://www=2Ezelfi=
=2Ecom/</A></FONT></DIV>
    <DIV>&nbsp;</DIV><BR>
    <DIV class=3DOutlookMessageHeader lang=3Dde dir=3Dltr align=3Dleft>
    <HR tabIndex=3D-1>
    <FONT face=3DTahoma size=3D2><B>Von:</B> A mailing list for Enterprise=
 JavaBeans=20
    development [<A=20
    href=3D"mailto:EJB-INTEREST@JAVA=2ESUN=2ECOM">mailto:EJB-INTEREST@JAVA=
=2ESUN=2ECOM</A>]=20
    <B>Im Auftrag von </B>Kalra, Ashwani<BR><B>Gesendet:</B> Montag, 15=2E=
 Mai=20
    2006 06:42<BR><B>An:</B> <A=20
    href=3D"mailto:EJB-INTEREST@JAVA=2ESUN=2ECOM">EJB-INTEREST@JAVA=2ESUN=
=2ECOM</A><BR><B>Betreff:</B>=20
    Synchronizing ejb method<BR></FONT><BR></DIV>
    <DIV></DIV>
    <DIV><SPAN class=3D087493904-15052006><FONT face=3DArial=20
    size=3D2>Hi,</FONT></SPAN></DIV>
    <DIV><SPAN class=3D087493904-15052006><FONT face=3DArial size=3D2>The=
 client of my=20
    ejb can be an jsp or standalone java class=2E&nbsp; How can I=
 synchronize=20
    access to the SLSB ejb method? I am using ejb2=2E0=
 version</FONT></SPAN></DIV>
    <DIV><SPAN class=3D087493904-15052006><FONT face=3DArial=20
    size=3D2></FONT></SPAN>&nbsp;</DIV>
    <DIV>&nbsp;</DIV>
    <P><SPAN lang=3Den-us><FONT face=3DArial size=
=3D2>__________________</FONT></SPAN>=20
    <BR><SPAN lang=3Den-us><FONT face=3DTahoma size=
=3D2>Regards</FONT></SPAN>=20
    <BR><SPAN lang=3Den-us><B><FONT face=3DTahoma size=3D2>Ashwani=20
    Kalra</FONT></B></SPAN> <BR></P>
    <DIV>&nbsp;</DIV>
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