java webService接口调用WordExtractor实例化时候报错

 InputStream in = null;
    WordExtractor extractor = null;
    try {
        in = new FileInputStream(filepath);
        extractor = new org.apache.poi.hwpf.extractor.WordExtractor(in);
        }catch(Exception c){
        c.printStackTrace();
    }
    try {
        if (extractor != null)
            extractor.close();
        if (in != null)
            in.close();
    } catch (IOException e) {
        e.printStackTrace();
    }