Can someone confirm/deny that if I obtain and utilise a datasource/connection from the ENC within a transactional CMP session bean will it become part of the beans transactional scope?

I am a little confused at the moment with regards to transactions within CMP session beans. If for example I have the following method;

- (void)addMessage(String message)

within my session bean and it is declared transaction REQUIRED. Within the method I do this;

{

Context context = new InitialContext();

DataSource dbSource = (DataSource) context.lookup("java:comp/env/jdbc/EBank"); *** an enc resource variable defined

Connection conn = dbSource.getConnection();

ps = dbConnx.prepareStatement("INSERT INTO MESSAGE VALUES(1, ?message)");

ps.executeQuery();

conn.close();

throw new RuntimeException(); *** causes transaction rollback

}

Will this be commited to the database or not? I have managed to produce test cases using our application server where dependent on from where I obtain my datasource it works or not...Is there some kind of rules on this?

thanks, Paul