This one time, at band camp, David Jencks said:
DJ>I really can't tell what you are doing from your description, and you
DJ>appear at one point to imply that you have a BMT entity bean which is
DJ>impossible.
DJ>
DJ>The spec is trying to lead you, in a stateless session bean, to code ut
DJ>usage something like this:
DJ>
DJ>ut.begin();
DJ>try {
DJ>//do something
DJ>} finally {
DJ>ut.commit();//or rollback
DJ>}
DJ>
DJ>Is this what you have?
I'm using a BMT session bean to front classses composing a DAO pattern.
The client is a simple Java application. The BMT session bean exposes the
methods startSession(), cancelSession() and endSession(). These methods
encapsulate the begin, rollback, commit of the UT. A UT is started by
a call from the client to the BMT session bean's startSession() which
fetches the UT from the SessionContext and called begin() on it. Here
is the relevant code:
client:
service = ServiceBroker.getPlanLockService();
...
service.startSession();
// do some work
service.endSession();
bean:
public void ejbCreate() throws CreateException
{
initConnection();
}
...
private void initConnection()
{
Context ctx;
StringBuffer sb;
DaoFactory factory;
if ( _dataSource == null && _jndiName != null )
{
try
{
ctx = new InitialContext();
sb = new StringBuffer();
sb.append( "java:" );
sb.append( _jndiName );
_dataSource = ( DataSource ) ctx.lookup( sb.toString() );
factory = LtpDaoFactory.getDaoFactory( LtpDaoFactory.JDBC,
_dataSource.getConnection() );
_dao = factory.getDao ( PlanLock.class );
}
catch (Exception e )
{
throw new EJBException( "Failed to initialize PlanLock Service!", e );
}
}
}
...
public void startSession() throws DaoException, RemoteException
{
try
{
UserTransaction userTx = context.getUserTransaction();
userTx.begin();
}
catch (Exception ex )
{
throw new DaoException("Error starting transaction: ",ex );
}
}
BTW, I inherited this design from someone else. I'm starting to think that it
should be ripped apart and made to be more lightweight.
Bruce
--
perl -e 'print unpack("u30","<0G)U8V4\@4VYY9&5R\"F9E<G)E=\$\!F<FEI+F-O;0\`\`");'
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