The data source referenced by the jta-data-source name is a DataSource provided by the container in JNDI. It is the same one that any application could look up and use, hence it is a javax.sql.DataSource.
XADataSource is an internal type used by the driver and container to coordinate XA, but users of the data source are not expected to participate at that level. The JPA provider acts like a client of the data source, using its connections to read and write, so it does not need to be aware of the XA protocol being implemented underneath.
Hope this makes things clearer.
On 10/05/2012 7:50 AM, Christian Romberg wrote:Hello,
It is not explicitly mentioned in the spec, but I guess I can safely assume, that the data source denoted by
jta-data-source is of type "javax.sql.XADataSource"?
After the JPA implementation has obtained an XAConnection from this XADataSource, is it expected to
to do any calls (and if so, in any specific order) on this XAConnection?
E.g. is it necessary, to call XAConnection.getConnection() to trigger that the app server calls XAConnection.getXAResource()
on the very same XAConnection? Or is it sufficient to just call "XADataSource.getXAConnection()" to trigger this?
(Some background: we don't use JDBC connections (being not an ORM) and probably we would need to provide our own
XADataSource implementation, so that the app server picks up our own XAResource implementation)
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[jsr338-experts] Re: question regarding jta-data-source