Branching this discussion off, as I realize my previous post forked a thread.
--- Simon Kitching <[EMAIL PROTECTED]> wrote: > On Wed, 2005-05-04 at 23:37 -0700, Brian Stansberry > wrote: > > A few semi-random points on parent-first vs. > > parent-last classloading: > > > > 1) EJBs, EARs and other non-webapp J2EE > deployments > > typically use parent-first loading. I'd thought > JBoss > > offered a deployment descriptor option that > allowed > > the deployer to choose parent-last, but I was > > mistaken. Too bad; I was hoping the scope of the > "if > > you want control, use parent-last classloading" > > approach would apply. > > Well, if the EJB spec is designed to prevent EJBs > from overriding jars > present in the parent classloader, who are we to > argue? > Sorry, didn't "cross-pollinate" between a discussion I was having on the JBoss forum and here. I briefly looked at the J2EE and EJB specs and didn't see anything that *required* parent-first. It really doesn't say anything about it at all. A comment by Scott Stark at JBoss implies the same. For the JBoss forum discussion, please see: http://www.jboss.org/index.html?module=bb&op=viewtopic&t=63520 > In other words, if a JCL logging implementation is > in the parent > classloader, then why not just bind to it? > > This doesn't give the EJB developer any control over > what logging lib is > used (though they don't typically need such > control). > > More controversially, it doesn't give any control to > the "application > assembler", as any jar they bundle will be ignored > if the container > provides an implementation. But that's the way the > J2EE spec wants > things to work it appears. > > And potentially even more controversially, it > doesn't give any control > to the "application deployer" unless they are also a > system > administrator for the container (and are willing to > change the logging > lib globally). But again, if the J2EE spec authors > chose "parent first" > as the only option, then that must be what they > wanted to happen. > > Or is it just JBoss that has adopted this position > for EJB deployment I > wonder? Could be (although my gut instinct says otherwise). Any BEA/Websphere/Geronimo/YourFavoriteAppServer experts out there know of support for child-first loading for EJBs? Brian __________________________________ Do you Yahoo!? Yahoo! Small Business - Try our new resources site! http://smallbusiness.yahoo.com/resources/ --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
