java.lang.NoClassDefFoundError: org/xml/sax/ext/Attributes2

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org/xml/sax/helpers/DefaultHandler
java.lang.NoClassDefFoundError: org/xml/sax/ext/Attributes2
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
at org.apache.xerces.parsers.AbstractSAXParser.(Unknown Source)
at org.apache.xerces.parsers.SAXParser.(Unknown Source)
at org.apache.xerces.parsers.SAXParser.(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl.(Unknown Source)
at org.apache.commons.digester.Digester.getParser(Digester.java:693)
at org.apache.commons.digester.Digester.getXMLReader(Digester.java:899)
at org.apache.commons.digester.Digester.parse(Digester.java:1666)
at org.apache.commons.digester.xmlrules.FromXmlRuleSet$URLXMLRulesLoader.loadRules(FromXmlRuleSet.java:196)
at org.apache.commons.digester.xmlrules.FromXmlRuleSet.addRuleInstances(FromXmlRuleSet.java:175)
at org.apache.commons.digester.xmlrules.FromXmlRuleSet.addRuleInstances(FromXmlRuleSet.java:140)
at org.apache.commons.digester.Digester.addRuleSet(Digester.java:1776)
at com.ubsw.bbook.uploader.UploadRunner.main(UploadRunner.java:17)

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