用于解决Dwr+Tomcat+Eclipse开发时报错的三个包：xalan_2_7_1.jar,serializer.jar,jdom.jar 如：Probably not an issue: org.jdom.Document is not available so the jdom converter will not load. This is only an problem if you wanted to use it.
jdom 参考文档 org.jdom Classes to represent the components of an XML document. org.jdom.adapters Classes to interface with various DOM implementations. org.jdom.filter Classes to programmatically filter nodes of a document based on type, name, value, or
