-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 John,
John Shilling wrote: > Do people really do option #1 in a production environment? Sure. > I can figure out how to set up realms for initialization parameters > but it is still a single class namespace within the Tomcat container, > right? Not really. One of the container's jobs is to isolate webapps from each other so they don't interfere. > It seems that special care must be taken with singleton objects (such > as the Hibernate Session Factory) so make sure that they are managed > in the context of their Virtual Host/App Instance. Yes. Each webapp gets its own ClassLoader which loads classes from that webapp's WEB-INF/lib/*.jar files. Assuming that your webapps are self-contained, even singletons should operate correctly "alongside" each other in different webapps. I'm not expert at Tomcat internal workings, but I expect that the level of isolation between two webapps in the same Virtual Host is the same as the level of isolation between two webapps in different Virtual Hosts. > Are there established practices for doing #1? Do not put any libraries in the server's shared class loaders unless it's okay that they actually be shared. For instance, don't shove Hibernate's JAR in there so you can save a little memory by sharing the classes. If you do that, you've "crossed the streams" so to speak. The main thing I would be worried about is the apps stealing time from each other. There's not a whole lot you can do about that except get more hardware. There's also the possibility of upgrades and such. do you want to be able to run some clients/customers on different versions of your application that require different JVMs, for instance? It should be obvious that a Tomcat instance must run on only one JVM at a time ;) - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkkkcdkACgkQ9CaO5/Lv0PA89QCgjkZxgWiQTi/9tAN0WiiDpKoF pCgAn06jbdr4DDysNXNfLoK8uRP9DqLm =fOpP -----END PGP SIGNATURE----- --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
