This is a common classloading problem but it is exacerbated by poorly designed interfaces, in this case the culprits seem to be javax.xml.transform.TransformerFactory (which relies on a system property (why is this bad? Think global variable)) and org.apache.avalon.excalibur.xml.xslt.XSLTProcessor (which relies on thread context class loader (why is this bad? Again, think global variable)). The reason both resort to using external variables is that the interfaces they define are missing one or more necessary parameters. I don't know how much such issues have been discussed on this list, so I won't go into this in more detail here. If it weren't for these additional problems, it wouldn't be necessary to resort to Sun's "endorsed" directory hack, a Cocoon component could simply load the implementation it needed using a private class loader.
Regards,
Chris
Joerg Heinicke wrote:
Not exactly, but the JDK 1.4 comes with older versions of Xalan, Xerces and so on and there seem to be some incompatibilities. And normally JDK classes are loaded first => the well-known endorsed problem.
Joerg
Christopher Oliver wrote:
Yes, adding xsltc-XXXXX.jar to common/endorsed fixed that problem. But what exactly caused it in the first place? Can someone explain?
Regards,
Chris
Ugo Cei wrote:
Christopher Oliver wrote:Sylvain,
Can you explain the connection between Xalan.jar, the endorsed directory, and the error message below? Unfortunately, I already tried copying xalan-2.4.1.jar, xercesImpl-2.1.0.jar and xml-apis.jar into %TOMCAT_HOME%/lib/endorsed but still got the same error.
^^^^ --> Make that common/endorsed
Remove the existing jars from common/endorsed and put the above mentioned jars (plus xsltc.jar, I'm not sure it's needed but I have it there too) and it should work perfectly with JDK 1.4.1.
Ugo
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