Hi Veton, Thanks for your message.
I use castor without to know how it works. So i never search on this way. Peraphs, i can do something on this way. But how can i use javax.transaction.UserTransaction ??? Do i have to modify castor's source code ? Do you use javax.transaction.UserTransaction?? Thanks Sylvie -----Original Message----- From: [EMAIL PROTECTED] [mailto:veton.kosovali@;belgacom.be] Sent: jeu. 31 octobre 2002 17:28 To: [EMAIL PROTECTED] Subject: Re: [castor-dev] [castor-dev]Pb with concurrent access on database Oracle Sylvie, I have noticed that in the JDO source code we access a javax.transaction.TransactionManager from the InitialContext. The J2EE specs talk only about accessing a javax.transaction.UserTransaction. The TransactionManager object allows more possibilities (which are used in Castor) than the UserTransaction. Could it be the reason of you problems? Hope it helps. Cheers, Veton. -----Original Message----- From: Sylvie Ramon [mailto:RamonS@;phonehouse.fr] Sent: 31 October 2002 3:40 PM To: [EMAIL PROTECTED] Subject: Re: [castor-dev] [castor-dev]Pb with concurrent access on database Oracle Hi, I search, i search, and i don't found anything. I import th latest version of castor. The problem persist. How can i be sure that my web application is "thread safe ?" Is someone has any experiences on web application with castor and concurrent access ? thanks a lot. Sylvie -----Original Message----- From: Bruce Snyder [mailto:ferret@;frii.com] Sent: mar. 29 octobre 2002 20:09 To: [EMAIL PROTECTED] Subject: Re: [castor-dev] [castor-dev]Pb with concurrent access on database Oracle This one time, at band camp, Sylvie Ramon said: SR>Hi, SR> SR>I have a problem and I don't understand what append. SR> SR>I work with WSAD 4.0, Oracle 8i and castor 0.9.3.9 . SR> SR>I develop an web application that read and create objects in database. SR>All is ok if I run this with one or several user in a real time. SR> SR>I try to test my web application with Opensta. SR>I store a scenario, and do an iteration on it. SR>I reduct "wait" to have intensives tests. SR>All is ok if I run ONE scenario. SR> SR>But, if I run SEVERAL scenarios ( concurrent access ) , I have some Exception, that append randomly : SR> SR> SR>org.exolab.castor.jdo.TransactionNotInProgressException: This database is closed SR> at org.exolab.castor.jdo.engine.DatabaseImpl.getTransaction(DatabaseImpl.java:464) SR> at org.exolab.castor.jdo.engine.DatabaseImpl.load(DatabaseImpl.java:269) SR> at org.exolab.castor.jdo.engine.DatabaseImpl.load(DatabaseImpl.java:287) SR> at fr.cmc.umm.entreprise.typologieappel.MotifContactService.getFicheMotif(MotifContactService.java:236) SR> ..... SR> SR>OR SR> SR> SR>java.lang.NullPointerException SR> at org.exolab.castor.jdo.engine.DatabaseImpl.getLockEngine(DatabaseImpl.java:196) SR> at org.exolab.castor.jdo.engine.OQLQueryImpl.create(OQLQueryImpl.java:270) SR> at org.exolab.castor.jdo.engine.DatabaseImpl.getOQLQuery(DatabaseImpl.java:439) SR> at fr.cmc.umm.entreprise.typologieappel.MotifContactService.getListeMotifActif(MotifContactService.java:314) SR> ..... SR> SR> SR>OR SR> SR> SR>org.exolab.castor.jdo.TransactionNotInProgressException: No transaction in progress for the current thread SR> at org.exolab.castor.jdo.engine.DatabaseImpl.getTransaction(DatabaseImpl.java:467) SR> at org.exolab.castor.jdo.engine.OQLQueryImpl.execute(OQLQueryImpl.java:458) SR> at org.exolab.castor.jdo.engine.OQLQueryImpl.execute(OQLQueryImpl.java:405) SR> at fr.cmc.umm.entreprise.typologieappel.SousMotifContactService.getListeSousMotifActif(SousMotifContactService.java:396) SR> .... SR> SR> SR> SR>Someone has an idea ? Sylvie, In my experience, these types of problems usually occur in either a multi-threaded environment (like your concurrent accesses) or in a situation where transactions are being nested. In either case, it is unclear as to which transaction needs to be commit()ed by Castor so it closes the closest one which may or may not be correct. The solution here is to make the application more thread safe or to name each Database instance differently. I have usually chosen to make the application more thread safe so that the confusion doesn't occur. Bruce -- perl -e 'print unpack("u30","<0G)U8V4\@4VYY9&5R\"F9E<G)E=\$\!F<FEI+F-O;0\`\`");' ----------------------------------------------------------- If you wish to unsubscribe from this mailing, send mail to [EMAIL PROTECTED] with a subject of: unsubscribe castor-dev Disclaimer This communication together with any attachments transmitted with it ('this E-mail') is intended only for the use of the addressee and may contain information which is privileged and confidential. If the reader of this E-mail is not the intended recipient or the employee or agent responsible for delivering it to the intended recipient you are notified that any use of this E-mail is prohibited. Addressees should ensure this E-mail is checked for viruses. The Carphone Warehouse Group PLC makes no representations as regards the absence of viruses in this E-mail. 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