From: <glassfish_at_javadesktop.org>
Date: Mon, 22 Oct 2007 21:36:08 PDT

Within a transaction, when EJB1 calls EJB2 and EJB2 also acquires a connection, connection sharing will happen. i.e., same physical connection as that of EJB1 will be used.

Refer
https://glassfish.dev.java.net/javaee5/docs/DG/beamj.html#beams
http://blogs.sun.com/JagadishPrasath/entry/connectionsharinginglassfish

eg:

Tx : Container Managed
TxAttribute : REQUIRED

EJB1.method1()
{
acquireConnection()
doDBOperaitons()
closeConnection();
ejb2.method2();
}

Tx : Container Managed
TxAttribute : REQUIRED

EJB2.method2()
{
acquireConnection() // will get same physical connection as EJB1.method1().
}
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