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Compile the java files to class files, then add them to the library. I'm surprised the newest version isn't available as a jar. That being said, I'd recommend ditching the 1.3 library and get the...

I have no clue why it doesn't work - you need to provide more information. Did you download .java files? .class files? Define 'doesn't work'

Is there something wrong with using the ISBNValidator from 1.3? Like I said it wasn't deprecated until 1.4 If you want the latest, you will probably have to get the latest source from svn: Validator...

org.apache.commons.validator.routines.ISBNValidator was introduced in v1.4, so you will not find it in any release prior to that. The org.apache.commons.validator.ISBNValidator should not be listed...