I have problem when use Jakarta Commons Net in Java


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  1. #1
    Join Date
    Mar 2006
    Posts
    4

    Question I have problem when use Jakarta Commons Net in Java

    Hi you, I'm new in Network Programming in Java and I'm excuting a FTP class to list all files and directories information from FTP Host . But I had a problem when I try to use "org.apache.commons.net.ftp" package in Jakarta Commons Net Library. It logins OK but fail when try list information in current working directory .
    Error:
    220 ftp1.0catch.com NcFTPd Server (licensed copy) ready.
    Workdir >>/
    Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/oro/text/regex/MalformedPatternException
    at org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory.createUnixFTPEntryParse r(DefaultFTPFileEntryParserFactory.java:169)
    at org.apache.commons.net.ftp.parser.DefaultFTPFileEntryParserFactory.createFileEntryParser(D efaultFTPFileEntryParserFactory.java:94)
    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 JClient.FTPClientTrial.useFTP(FTPClientTrial.java:52)
    at JClient.FTPClientTrial.main(FTPClientTrial.java:23)
    Java Result: 1


    CODE :
    import java.text.DateFormat;
    import java.util.Date;
    import org.apache.commons.net.ftp.*;

    import java.io.*;
    public class FTPClientTrial {
    public static void main(String[] args) {
    new FTPClientTrial().useFTP("ftp://thanhnam-it.0catch.com", "/", "J://AcrobatReader//Readme.htm",
    "usernam", "password");
    }

    public void useFTP(String ftpserver, String directoryName,
    String filetoUpload, String username, String password) {
    FTPClient ftpClient = new FTPClient();

    try {
    ftpClient.connect(ftpserver);
    System.out.print(ftpClient.getReplyString());

    // check reply code.
    if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {
    ftpClient.disconnect();
    System.out.println("Connection refused.");
    return;
    }

    ftpClient.login(username, password);
    System.out.println("Workdir >>" +
    ftpClient.printWorkingDirectory());

    //Store file
    FileInputStream input = new FileInputStream(filetoUpload);
    ftpClient.storeFile(filetoUpload, input);

    //ERROR HERE : List all Files and directories
    FTPFile[] files = ftpClient.listFiles(); System.out.println( "Number of files in dir: " + files.length );
    DateFormat df = DateFormat.getDateInstance( DateFormat.SHORT );
    for( int i=0; i<files.length; i++ )
    {
    Date fileDate = files[ i ].getTimestamp().getTime();

    // Download a file from the FTP Server
    System.out.print( df.format( files[ i ].getTimestamp().getTime() ) );
    System.out.println( "\t" + files[ i ].getName() );
    File file = new File( "/directory" + File.separator + files[ i ].getName() );
    FileOutputStream fos = new FileOutputStream( file );
    ftpClient.retrieveFile( files[ i ].getName(), fos );
    fos.close();
    file.setLastModified( fileDate.getTime() );
    }

    ftpClient.logout();
    ftpClient.disconnect();
    System.out.println("Disconnected");

    } catch (IOException e) {
    if (ftpClient.isConnected()) {
    try {
    ftpClient.disconnect();
    System.out.println("Disconnected");
    }
    catch (IOException f) {
    // do nothing
    }
    }

    e.printStackTrace();
    }
    finally {
    try {
    ftpClient.logout();
    ftpClient.disconnect();
    }
    catch (IOException f) {
    System.out.println("Disconnected");
    }
    }
    }
    }
    ---------------------
    So I don't understand what type of error and how I can solve it? Anyone show me? Thank u a lot!
    Last edited by wintersun; 11-25-2006 at 10:38 AM.

  2. #2
    Join Date
    Mar 2004
    Posts
    635
    Given the type of exception thrown, your code somewhere is trying to use an incorrect regular expression pattern. It could be an error in the package. If there's a Jakarta forum I'd probably ask there.

    Also, using code tags would make this much more readable.

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