Files list of a FTP directory

Hi can any one help out regarding listing of a directories of a ftp location
i used org.apache.commons.net.ftp
i tried in following way
FTPClient client = new FTPClient();
try {
client.connect("192.168.100.189");
     client.login("XXXX", "XX");
     int reply=client.getReplyCode();
     System.out.println(reply); //i can able to connect to the ftp location with reply code 230.
     FTPFile[] files=client.getFiles();//here it displaying the exception
     System.out.println(files.length);
catch(Exception e)
System.out.println(e);
Please help out
Regards
Praveen

Thanks for your reply
java.lang.NoClassDefFoundError: org/apache/oro/text/regex/MalformedPatternException
     at org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory.createNTFTPEntryParser(DefaultFTPFileEntryParserFactory.java:184)
     at org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory.createFileEntryParser(DefaultFTPFileEntryParserFactory.java:102)
     at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:2358)
     at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:2141)
     at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:2188)
     at FTPTest.main(FTPTest.java:29)
Regards
Praveen

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