Why "TransactionReaper::check timeout for TX" warning in JBoss server.log

Question

I am using Hibernate 3.6.0 with JBoss 6.0-Final release and my Database is MS-SQL Server 2008. I have to fetch employee data from LDAP server and insert those into database - the count of LDAP entries are 180,000 or more. I am using bean managed transaction because using CMT my transaction never gets committed (because of high volumn of insert).

The logic is: in a while-loop I am keep on fetching & creating entries in database using JPA (Hibernate). Thus I am having a long series of fetch-create activities as part of a stateless EJB api. I am invoking entityManager.flush()/clear() and commiting transaction after processing every 20 records.

I am getting following WARN message in JBoss Serevr.log after I have inserted 40,000 records. Not sure if it is really an warning or error?
Though I get this error, the server still runs and continues with inserting new records in DB.

Can anyone suggest if I am doing something wrong? Or what causes this error?

Is there a way to increase the EJB timeout?

16:52:49,690 WARN  [com.arjuna.ats.arjuna] ARJUNA-12117 TransactionReaper::check timeout for TX 0:ffff105966b8:126a:4db9fc0a:a4 in state  RUN
16:52:49,691 WARN  [com.arjuna.ats.arjuna] ARJUNA-12121 TransactionReaper::doCancellations worker Thread[Transaction Reaper Worker 0,5,jboss] successfully canceled TX 0:ffff105966b8:126a:4db9fc0a:a4

Any help will be much appreciated.