org.gjt.xpp.XmlPullParserException 错误解决

// 定义一个SringBuffer对象，用于接受参数
StringBuffer xmlBuffer = new StringBuffer();
String line = null;
// 通过request获取获取输入流
BufferedReader reader = request.getReader();
// 一次读取请求输入流的数据
while ((line = reader.readLine()) != null) {
xmlBuffer.append(line);
}
// 将从输入流中读取到的内容转换	成字符串
String xml = xmlBuffer.toString();
// 以Dom4J开始解析XML字符串
InputStream in = new ByteArrayInputStream(xml.getBytes());
Document xmlDoc = (Document)new XPPReader().read(new ByteArrayInputStream(xml.getBytes()));

今天在学习Ajax时后，写到

Document xmlDoc = (Document)new XPPReader().read(new ByteArrayInputStream(xml.getBytes()));

一直报错误，提示

Multiple annotations found at this line:
- The type org.gjt.xpp.XmlPullParserException cannot be resolved. It is indirectly referenced from
required .class files
- The method read(InputStream) from the type XPPReader refers to the missing type XmlPullParserException
- The type org.gjt.xpp.XmlPullParserException cannot be resolved. It is indirectly referenced from
required .class files
- The method read(InputStream) from the type XPPReader refers to the missing type XmlPullParserException

异常，查了半天，并且看了源代码，原因是，找不到

import org.gjt.xpp.XmlPullParserException;

的包，于是，网上各种找，都没有结果。随后在dom4j的源代码包中找到了
pull-parser-2.1.10.jar架包，于是加入，顺利解决。