jaxen.jar和dom4j.jar

java.lang.NoClassDefFoundError:org/jaxen/JaxenExceptionatorg.dom4j.DocumentFactory.createXPath(DocumentFactory.java:230)atorg.dom4j.tree.AbstractNode.createXPath(AbstractNode.java:207)atorg.dom4j.tree.AbstractNode.selectSingleNode(AbstractNode.java:183)atdemo.TestXML.getTaskByName(TestXML.java:19)atsun.reflect.Native