Stu- Thanks for the response! Since we're using WebLogic 6.1, we haven't started using JDK 1.4 yet. As such, my experience level with JDK 1.4 is very low. I was unaware of endorsed classes, so thanks for pointing that out to me.
I'll give it a shot, and I'm anticipating that it will work flawlessly. Thanks again Stu, -c On Wed, Feb 12, 2003 at 06:28:21PM -0500, Stu Halloway (DevelopMentor) wrote: > Hi Christopher, > > Have you tried shoving the org.xml classes into the endorsed standards > override directory? [1] > > Stu > > [1] http://java.sun.com/j2se/1.4.1/docs/guide/standards/index.html > > ---------------------------------------------------------- > Stuart Halloway : staff.develop.com/halloway > DevelopMentor : www.develop.com > Essential Java : www.develop.com/courses/essjava > ---------------------------------------------------------- > > Christopher Blunck wrote: > >Hi, > > > >I hope this email reaches the mailing list. I subscribed 10+ minutes ago, > >but haven't received a response from your mailing list manager. As a > >result, > >I'd appreciate it if any replies can be Cc:'ed to my email address. > >Thanks. > > > >Here's my situation, and I'm hoping somebody can comment on it. > > > >In ant, when I run my junits, I assemble a classpath that contains > >weblogic.jar. > >We use WebLogic 6.1 SP2 (which is not compatible with JDK 1.4 and the newer > >XML libraries). I have a junit test that uses Apache SOAP (v2.2) to make > >a call to our application. When SOAP tries to assemble the XML message to > >post to the servlet on the server side, it needs to load a parser. How > >does it do so? It uses javax.xml.parsers.DocumentFactory. This class is > >defined both in rt.jar (which comes with JDK 1.4) as well as in > >weblogic.jar. > >I'll refer to DocumentFactory(w) as the WebLogic version of > >DocumentFactory, > >and DocumentFactory(j) as the JDK version of DocumentFactory. When ant's > >classloader is asked to load javax.xml.parsers.DocumentFactory, it uses the > >parent classloader (the JDK classloader) because the constructor for > >AntClassLoader calls addSystemPackageRoot("javax"). When the > >loadClass(...) > >method in AntClassLoader is called, if the class to be loaded begins with > >any of the "system packages" (java or javax), it delegates loading to > >the parent classloader (the system classloader). The result? > >AntClassLoader > >returns DocumentFactory(j) (the DocumentFactory that comes with JDK 1.4). > >Sounds reasonable to me... > > > >DocumentFactory (or some class that DocumentFactory calls) uses an > >org.xml.sax.InputSource. This class is also defined both in rt.jar from > >the JDK distribution as well as in weblogic.jar. When DocumentFactory > >tries > >to load InputSource, AntClassLoader looks at "org.xml.sax.InputSource" and > >says "that's not a system package", and thus it (AntClassLoader) loads the > >class using it's own rule(s) (which really just use the classpath I have > >defined in my build.xml). The result? AntClassLoader returns > >InputSource(w) (the InputSource that comes with weblogic) because it starts > >with org.xml.sax and is not a system package. > > > >When all the dust settles, I have a DocumentFactory from the JDK and an > >InputSource from weblogic. The two don't line up, and I get a > >LinkageError. > > > >I changed the source code for the constructor for AntClassLoader so that it > >does *not* add javax as a system package. This forced AntClassLoader to > >load the DocumentFactory from weblogic.jar instead of rt.jar, and since > >InputSource is read from weblogic.jar everything lined up and the my unit > >test ran successfully. > > > >I'm writing because I'm not particularly happy with changing the source > >code > >of an open source project without notifying the maintainers of my problem > >and > >asking for any advice or insight they may have into a solution. I realize > >that > >part of this problem derives from using weblogic.jar, but I'm unwilling to > >accept that as the full explanation (saying Ant 1.5.1 and WebLogic 6.1 SP2 > >are *incompatible* seems a bit harsh). > > > >Any words of wisdom? > > > > > >-c > > -- 9:40am up 115 days, 1:15, 1 user, load average: 0.87, 3.38, 4.29
