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| | | Two phase commit transaction using WSAD5.0 and DB2 | Two phase commit transaction using WSAD5.0 and DB2 2005-04-27 - By Hrishikesh Barua
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Hi Anuj,
Application programmers are not supposed to use the XADataSource
interface directly - it's used by the TransactionManager internally (in this
case, the TM inside your appserver). You should use the DataSource interface in
your application - and the appserver will take care of the transaction
management transparently, provided you use either the declarative or
programmatic model.
If you're using EJB's you can use either of them; if you're using web
components you can use the UserTransaction API to manage your transactions. You
datasource will automatically participate in those transactions (it's the
responsibility of the appserver to make it participate in 2PC).
Also, the appserver never exposes the actual DataSource from the driver - this
is to provide services like connection pooling and transaction management.
Depending on the appserver, you might also have to mark the datasource as
transactional sometimes.
Regards
Hrish
-- -- Original Message -- --
From: Anuj Kumar
To: A mailing list for Java(tm)2 Platform,Enterprise Edition
Cc: Hrishikesh Barua
Sent: Wednesday, April 27, 2005 12:54 PM
Subject: Re: Re: Two phase commit transaction using WSAD5.0 and DB2
hi Harish,
thanx for ur reply but
javax.sql.DataSource db2Datasource = null;
does not work in this case since i need the instance of either
DB2XADataSource or XADataSource class to proceed with 2 phase commit
transaction Api's and DB2XADatasource class does not implement DataSource so we
can't type cast too.
any other solution ???
Thanks and Regards,
Anuj
On Wed, 27 Apr 2005 Hrishikesh Barua wrote :
>Hello,
> You should cast the object that you look up to a javax.sql.DataSource
object. Using any proprietary APIs means your app will not run on any other
appserver. In this case the object that you get back from the lookup is a WAS
datasource wrapper - which is correct.
>
>Declare
> javax.sql.DataSource db2Datasource = null;
>
>Regards
> Hrish
> -- -- Original Message -- --
> From: Anuj Kumar
> To: J2EE-INTEREST@(protected)
> Sent: Wednesday, April 27, 2005 11:46 AM
> Subject: Two phase commit transaction using WSAD5.0 and DB2
>
>
>
> Hi All,
>
> I am trying to implement (prototype) 2 phase commit transaction protocol
using wsad5.1 and db2.i configured the DB2XADatasource provider in wsad and
when i try yo run my program i get
> [4/27/05 11:27:13:296 GMT+05:30] 1accbc8a WebGroup E SRVE0026E:
[Servlet Error]-[A]: java.lang.ClassCastException: com.ibm.ws.rsadapter.jdbc
.WSJdbcDataSource
> at hello.A.getDataSource(A.java:196)
>
> while looking up and casting the DB2XADatasource.
>
> My method which is supposec to return DB2XADatasource is..
>
> public static DB2XADataSource getDataSource(String jndiName) {
>
> InitialContext ctx = null;
> DB2XADataSource db2Datasource = null;
> Connection conn = null;
>
> try {
> ctx = new InitialContext();
>
> db2Datasource = (DB2XADataSource) ctx.lookup(jndiName);
>
>
> } catch (NamingException ne) {
> ne.printStackTrace();
> }
>
> return db2Datasource ;
> }
>
> }
>
> can anyone Help me out ???
>
> Thanks a lotttt
> Anuj
>
>
>
>
> ========================================================================
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<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859 (See http://iso-8859.ora-code.com)-1">
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<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>Hi Anuj,</FONT></DIV>
<DIV><FONT face=Arial size=2> </FONT><FONT face=Arial
size=2> Application programmers are
not supposed to use the XADataSource interface directly - it's used by the
TransactionManager internally (in this case, the TM inside your appserver). You
should use the DataSource interface in your application - and the appserver
will
take care of the transaction management transparently, provided you use either
the declarative or programmatic model.</FONT></DIV>
<DIV><FONT face=Arial size=2> If you're using EJB's you can use either of
them; if you're using web components you can use the UserTransaction API to
manage your transactions. You datasource will automatically participate in
those
transactions (it's the responsibility of the appserver to make it participate
in
2PC).</FONT></DIV>
<DIV><FONT face=Arial size=2> Also, the appserver never exposes the actual
DataSource from the driver - this is to provide services like connection
pooling
and transaction management.</FONT></DIV>
<DIV><FONT face=Arial size=2> Depending on the appserver, you might also
have to mark the datasource as transactional sometimes.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards</FONT></DIV>
<DIV><FONT face=Arial size=2> Hrish</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT:
#000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">-- -- Original Message -- -- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=anujkumar73@(protected)
href="mailto:anujkumar73@(protected)">Anuj Kumar</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=J2EE-INTEREST@(protected)
href="mailto:J2EE-INTEREST@(protected)">A mailing list for Java(tm)2
Platform,Enterprise Edition</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=hrishikesh.barua@(protected)
.COM
href="mailto:hrishikesh.barua@(protected)">Hrishikesh Barua</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, April 27, 2005 12:54
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Re: Two phase commit
transaction using WSAD5.0 and DB2</DIV>
<DIV><BR></DIV>
<P> <BR>hi Harish,<BR>thanx for ur reply but <BR>
javax.sql.DataSource db2Datasource = null;<BR>does not work in this case
since
i need the instance of either DB2XADataSource or XADataSource class to
proceed
with 2 phase commit transaction Api's and DB2XADatasource class does not
implement DataSource so we can't type cast too.<BR>any other solution
???<BR><BR>Thanks and Regards,<BR>Anuj<BR><BR><BR>On Wed, 27 Apr 2005
Hrishikesh Barua wrote :<BR>>Hello,<BR>> You should cast the
object that you look up to a javax.sql.DataSource object. Using any
proprietary APIs means your app will not run on any other appserver. In this
case the object that you get back from the lookup is a WAS datasource wrapper
- which is correct.<BR>><BR>>Declare<BR>>
javax.sql.DataSource db2Datasource =
null;<BR>><BR>>Regards<BR>> Hrish<BR>> -- -- Original
Message -- --<BR>> From: Anuj Kumar<BR>> To:
J2EE-INTEREST@(protected)<BR>> Sent: Wednesday, April 27, 2005 11
:46
AM<BR>> Subject: Two phase commit transaction using WSAD5.0 and
DB2<BR>><BR>><BR>><BR>> Hi All,<BR>><BR>> I am
trying to implement (prototype) 2 phase commit transaction protocol using
wsad5.1 and db2.i configured the DB2XADatasource provider in wsad and when i
try yo run my program i get<BR>> [4/27/05 11:27:13:296 GMT+05:30]
1accbc8a WebGroup E SRVE0026E: [Servlet Error]-[A]:
java.lang.ClassCastException:
com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource<BR>>
at hello.A.getDataSource(A.java:196)<BR>><BR>> while looking up
and casting the DB2XADatasource.<BR>><BR>> My method which is
supposec to return DB2XADatasource is..<BR>><BR>> public static
DB2XADataSource getDataSource(String jndiName) {<BR>><BR>>
InitialContext ctx = null;<BR>>
DB2XADataSource db2Datasource =
null;<BR>> Connection conn =
null;<BR>><BR>> try
{<BR>> ctx =
new InitialContext();<BR>><BR>>  
;
db2Datasource = (DB2XADataSource)
ctx.lookup(jndiName);<BR>><BR>><BR>>
} catch (NamingException ne) {<BR>>
ne.printStackTrace();<BR>>
}<BR>><BR>>
return db2Datasource ;<BR>>  
;
}<BR>><BR>> }<BR>><BR>> can anyone Help me out
???<BR>><BR>> Thanks a lotttt<BR>>
Anuj<BR>><BR>><BR>><BR>><BR>>
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=====================<BR>>To
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