How to use org.apache.poi.hdf.extractor.WordDocument correctly

[白 可]

Hi, everyone.
In my project, I need to deal with the tables in the word documents.
But I got some problems during the using of the WordDocument class.
for example, this is my simple source code.(Maybe it is wrong)
import java.io.*;
import org.apache.poi.hdf.extractor.WordDocument;
public class TestHDFDocument {
 public TestHDFDocument() {
 }
 public static void main(String[] args) {
   try
     {
         String outName = "C:\\test.xml";
         InputStream is = new FileInputStream ("C:\\hello.doc");
         WordDocument file = new WordDocument(is);
         file.openDoc();
         file.closeDoc();
     }
     catch(Exception e)
     {
         e.printStackTrace();
     }
     System.exit(0);
 }
}
when I run this code,there are a lot of errors below:
java.lang.NullPointerException
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:176)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:70)
	at 
org.apache.poi.hdf.extractor.WordDocument.closeDoc(WordDocument.java:1501)

	at 
org.apache.poi.hdf.WordDocument.TestHDFDocument.main(TestHDFDocument.java:15)


my problem is how to use this class correctly.
thanks and regards
baike
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