org.jdom.IllegalDataException: The data ""is not legal for a JDOM attribute: 0xb is not a legal 异常

今天用jdom生成xml，在操作中出现了 org.jdom.IllegalDataException: The data ""is not legal for a JDOM attribute: 0xb is not a legal 异常，仔细跟踪发现，在原有的组建对象的属性中出现了异常字符，通过下面的替换，再重新转换成String,trim后正常。

     char [] xmlChar = paragraph.toCharArray();
     for (int i=0; i < xmlChar.length; ++i) {
     if (xmlChar[i] > 0xFFFD)
     {
        //直接替换掉0xb
         xmlChar[i] =' ';
     }
     else if (xmlChar[i] < 0x20 && xmlChar[i] != 't' & xmlChar[i] != 'n' & xmlChar[i] != 'r')
     {
        //直接替换掉0xb
         xmlChar[i] =' ' ;
     }
     }