The other day, somebody posted a well written document on Java2 class loaders. I wish I had the url to the document, but I can't find it. The gist of the document was this: All class loaders within a jvm form a hierarchy with the boot class loader being at the root. No matter which class loader in this hierarchy is utilized, it's job is to always delegate to it's parent class loader before attempting to load anything on it's own. In this case I belive orion's application class loaders will still be children of orion's class loader, so classes defined at the class path level (using orion.jar's classpath manifest attribute) will be used. Even if you create a lib entry to jaxp in server.xml or orion-application.xml the jxap that ships with orion will be used. Andre -----Original Message----- From: Conrad Chan [mailto:[EMAIL PROTECTED]] Sent: Tuesday, February 27, 2001 4:25 PM To: Orion-Interest Subject: RE: JAXP Have you try to package your version of JAXP files inside your application archive (ear, war)? This idea comes from the fact that every class is identified not only its class name but also which class loader it is loaded from. Since Orion supports dynamic loading of application files, it should be using a custom classloader for every application. Hence, by theory, you should be able to use a different JAXP than the one Orion uses. Of course it depends on exactly how Orion implements this. If Orion looks for classes from the default classloader first, it is still not going to work. But I think it does worth a try. Hope this help Conrad -----Original Message----- From: Richard Doust [mailto:[EMAIL PROTECTED]] Sent: Friday, February 23, 2001 4:31 PM To: Orion-Interest Subject: JAXP I have been working on this problem all day. I have posted once before and no one responded. I will try again. I'm no Java expert and this is just my ignorance, but can anyone tell me if I'm correct in my assumptions on this. I am trying to develop server side code that runs under Orion that uses the JAXP code that Sun has recently released. There are different versions of parser.jar, xalan.jar and jaxp.jar distributed with Orion. Older ones. I have tried replacing the older ones with the newer ones because my code requires the newer ones and I guess that my code will be running in the same image as Orion. Orion fails to start due to an exception while trying to parse its configuration files. Putting the old .jar files back, it works again. So, now it occurs to me that I'm basically stuck running with whatever version of support code the tools I'm using are dependent on. If I'm right, that means I can't use the latest version of JAXP until Orion does? Is that right? Anyone? Thanks, Rich
