Hello,
as I saw in many mailing lists I am not the only one who had the following
problem, so I post a solution here.
Problem:
After installing tomcat 4.01 all example JSPs in the provided applications
work well. But when you try to run your own JSPs in your own applications
you suddenly get this exception thrown:
exception
javax.servlet.ServletException: Servlet.init() for servlet jsp threw
exception
...
...
root cause
java.lang.ClassCastException:
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl
Solution (at least in my case):
I had an xml parser version in my /appname/WEB-INF/lib directory which was
different from the xml parser located in {TOMCAT-ROOT}/common/lib. It seems
that if there is an xml parser located in the app's WEB-INF/lib directory,
then this parser is being used to compile the application's JSPs. And this
leads eventually to the ClassCastException.
The application, where this error occured was originally transferred from
JRUN 3.1 where this behaviour does not occur. On a JRUN 3.1 server the xml
parser in an application's WEB-INF/lib directory is NOT being used to
compile the application's JSPs. However in tomcat 4.01 it is being USED. So
watch out about multiple xml-parser versions!
Maybe this helps some people.
Sincerely
Michael Kastner
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