According to several sources among others
"JBoss Administration and Development: Third Edition (3.2.x Series)"
it is described of "Instance Per Transaction" that :
"the transactional isolation behavior of this option is equivalent to READ_COMMITTED."
I wonder what are the arguments for that kind of conclusion ?
I guess, that when transactions ( and locks ) with "Instance Per Transaction" are managed by database itself according to the isolation level of the JDBC connection, you get for example REPEATABLE_READ, if the JDBC connection's isolation level define it so.
Any clarifications for my confusion ?
You are right.