Thanks to both Thomas and Armin for their replies on this thread. Speaking for myself, I'm nervous about using OJB on my current project, too, but I don't think the source is entirely OJB. A big part of it is fear of what I DON'T know. I very much liked the idea of using a tool, developed by folks more expert than me. I know enought about JDBC to be able to do CRUD operations and simple transactions, but the idea of having a layer to abstract all that out of business objects was appealing.
I heard Martin Fowler talk a few months ago. He mentioned using JAXOR as an O/R mapping tool. When I looked into it, I found NO documentation whatsoever. Google quickly turned up OJB as an alternative. I liked it right away, because it had more documentation than JAXOR, it the cachet of being a Jakarta project, and the stuff that I did actually worked. Now I've got a tree of four tables linked with m:n associations, all working in JUnit tests. All that's well and good, but now I'm nervous about that learning curve and what I'm ignorant of. I've done everything with the PersistenceBroker API because it was easy to follow in the docs. But now I'm thinking that I should really be doing all of this using ODMG API instead. More learning, with a deadline approaching. Here's a fundamental question: RDBMS developers have put a lot of effort into maintaining referential integrity, managing transactions, etc. It seems to me that OJB is taking over a lot of that stuff. When I created my tables, I didn't add foreign key constraints. I left all that to OJB. The ODMG API will handle true transactions and object/row locking. But what if OJB isn't the only path into the database? A DBA might balk at leaving all those things that the RDBMS would handle to OJB. Is it possible still leave foreign key constraints in the database so others could use them without OJB? My compliments to Thomas, Armin, and the team that created OJB. None of this fear is a reflection on your excellent work. It has more to do with the fact that this is still a version 1.0 release candidate and my own ignorance. Sincerely, MOD --- Thomas Mahler <[EMAIL PROTECTED]> wrote: > Hi Bonnie, > > Bonnie MacKellar wrote: > > I was not at Mobius before 1999, so I really would > not know... > > > > Yes, this is for an important project and I am not > feeling > > very good about this. The alternatives though, are > to buy > > something or do it ourselves. Our company tends to > be of > > the "do it yourself" mentality. Since what we > need is exactly > > what OJB provides, it seems silly to replicate it. > > On the other hand, it is often easier to deal with > bugs > > in your own code then with bugs in someone else's > code. > > OJB is 3 years of heavy designed code by experts in > the O/R area. > We have a complete regression testsuite that covers > each and every > aspect of the system. > > Do it yourself is definitely a bad idea in this > area. If you don't trust > us better use a commercial tool like TopLink. > > OJB is in production use in large projects for 2 > years now. > My company is using OJB in several large and mission > critical software > projects since a year now. > > > > > I would feel a lot better about this if the mail > archives > > worked. My usual approach with this kind of system > is > > to really sift through user archives, looking for > similar > > experiences. > > I admit this is really annoying. But this is clearly > not an OJB problem, > but an infrastructure problem with some Apache > server. > For the time being use archive mirrors at GMANE or > at > http://www.mail-archive.com/ojb-user%40db.apache.org/ > > cheers, > Thomas > > > > > Bonnie > > > > -----Original Message----- > > From: Michael Duffy [mailto:[EMAIL PROTECTED] > > Sent: Friday, March 28, 2003 1:19 PM > > To: OJB Users List > > Subject: RE: regression test errors > > > > > > > > Bonnie, > > > > I'm responding to a note you sent to the OJB > mailing > > list. > > > > Is Mobius based in the NYC area? I knew a guy > named > > Howard Deiner who worked at a company named > Mobius. > > His tenure would have been prior to 1999. Just > > curious. > > > > Also curious - will the system you'll be > installing > > OJB into be a large production application? I've > been > > getting OJB up and running for a smaller > production > > project, and I'm nervous about it. I see all the > > problems on the mailing list and sketchy > documentation > > and wonder what I'm getting myself into. JMHO, of > > course. Are you feeling the same way? Thanks - > MOD > > > > > > --- Bonnie MacKellar <[EMAIL PROTECTED]> wrote: > > > >>Thanks for the advice. > >>This parameter is set in > >> > > > > > C:\db-ojb-1.0.rc1\target\test\ojb\repository_database.xml, > > > >>right? Do I need to change anything else to modify > >>this behavior? > >> > >>I'm still trying to feel my way around this > system. > >>Basically, I have > >>about a week to make a recommendation on using it, > >>in a large project. > >>Ease of use is an important consideration, > >>especially to the powers-that-be > >>who are managing this project. > >> > >>Bonnie > >> > >>-----Original Message----- > >>From: Armin Waibel > >>[mailto:[EMAIL PROTECTED] > >>Sent: Wednesday, March 26, 2003 6:42 PM > >>To: OJB Users List > >>Subject: Re: regression test errors > >> > >>Seems a problem with the used sequence manager > >>(SequenceManagerHighLowImpl). > >>Try to run the test cases with > >>SequenceManagerInMemoryImpl > >>Do you get the same results? > >> > >> > > > > > > > > __________________________________________________ > > Do you Yahoo!? > > Yahoo! Platinum - Watch CBS' NCAA March Madness, > live on your desktop! > > http://platinum.yahoo.com > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: > [EMAIL PROTECTED] > > For additional commands, e-mail: > [EMAIL PROTECTED] > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: > [EMAIL PROTECTED] > For additional commands, e-mail: > [EMAIL PROTECTED] > __________________________________________________ Do you Yahoo!? Yahoo! Platinum - Watch CBS' NCAA March Madness, live on your desktop! http://platinum.yahoo.com --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
