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EJB and JDBC/Distributed Transactions
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Cory Wilkerson
Ranch Hand
Joined: Aug 14, 2001
Posts: 84
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All,
I'm attempting to get my head around something here and I can't make 2 and 2 == 4. My question is this:
I've currently stepped into a pretty hefty EJB-based architecture where all EJBs (BMP) have the trans-attribute set to Required. Does this implicity imply that Connection objects used by any given business method in any given entity bean must be generated from a DataSource that supports distributed transactions?
I understand that it means that the business method itself will execute in a transactional context, but, must the JDBC resources being used also support distributed functionality.
Thanks,
Cory Wilkerson
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Kyle Brown
author
Ranch Hand
Joined: Aug 10, 2001
Posts: 3879
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The answer is yes, probably. Most Transaction Servers do support the idea of both global and local transactions, but the support for local transactions is usually vendor-specific and somewhat limited. If you choose to use a 2PC enabled datasource the container can usually figure out on its own if it can optimize for 1PC if that's all that's needed.
Kyle
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Kyle Brown, Author of Persistence in the Enterprise and Enterprise Java Programming with IBM Websphere, 2nd Edition
See my homepage at http://www.kyle-brown.com/ for other WebSphere information.
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subject: EJB and JDBC/Distributed Transactions
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