NoClassDefFoundError is driving me insane!

I would very much like to get the CSS Validator working on my local
machine command line but Java is ignoring all class paths! Java is JDK
1.5.0_10 on a Unix host.

# cd {dir containing jars}
# export
CLASSPATH=css-validator.jar:jigsaw.jar:servlet-api.jar:tagsoup-1.1.3.jar
:xercesImpl.jar:xml-apis.jar
# java -jar css-validator.jar

Exception in thread "main" java.lang.NoClassDefFoundError:
org/w3c/tools/resources/ProtocolException

I have tried everything I can think of: absolute path names, inline
classpath, direct CssValidator reference from java, using JUST the
jigsaw.jar where the ProtocolException.class is located, and still the
exception!

I spun my wheels most of the day trying to separate the minimal "build
it from scratch" instructions and incorporate the downloaded jars into a
Tomcat server on a Windows XP host (JDK 1.6.0_02) to no avail. All I
need is to get it working on the command line, then I'll figure out the
rest to make it run under some servlet engine. 

What am I missing here besides a basic clue?

All helpful suggestions appreciated.

*****

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