dom4j解析xml删除不了子节点，还请高手指教

XML内容：

<?xml version="1.0" encoding="GBK"?>

<users> 
  <user name="tom" pwd="123"/>  
  <user name="123" pwd="123"/>  
  <user name="456" pwd="456"/>  
  <user name="789" pwd="789"/>
</users>

代码：
SAXReader reader = new SAXReader();
Document document = reader.read(file);
Element root = document.getRootElement();

List<?> list = root.elements("user");
  for (int i = 0; i < list.size(); i++) {
if(((Element)list.get(i)).attributeValue("name").equals(name)){
root.remove((Element)list.get(i));
}
  }

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