NullPointerException in method SocketClient.getLocalAddress()
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Key: NET-301
URL: https://issues.apache.org/jira/browse/NET-301
Project: Commons Net
Issue Type: Bug
Affects Versions: 2.0
Environment: Sun SPARC Ultra-5, Solaris 8
java version "1.3.1_10"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_10-b03)
Java HotSpot(TM) Client VM (build 1.3.1_10-b03, mixed mode)
Reporter: Hector
Hello,
I'm new with Java (well, I have develop some programs, but not so hard....until
now) and I'm trying to create an applet which can open an ftp connection from
the client side to the server one, and download several files (I don't know if
it's the best way to do what I want, but as far as I have read in internet,
this is the most common and easy method used by many people).
The problem is about the FTPClient class:
I am able to connect, logon, set transfer mode, change the working directory,
list the names of the directory...but when I try to perform a simple call to
the "retrieveFile (remote, local)" method, I'm getting a NullPointerException
(the call to that method is done after clicking on a download button):
Exception in thread "AWT-EventQueue-2" java.lang.NullPointerException
at
org.apache.commons.net.SocketClient.getLocalAddress(SocketClient.java:441)
at
org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:447)
at
org.apache.commons.net.ftp.FTPClient.retrieveFile(FTPClient.java:1257)
at Applet1.jButton1_actionPerformed(Applet1.java:229)
at Applet1.access$100(Applet1.java:21)
at Applet1$3.actionPerformed(Applet1.java:95)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown
Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
And the code is very simple:
String reply;
boolean success;
String path = new String ("PATH_TO_REMOTE_FILE");
try
{
fich_local = new File (jTextField1.getText () + "/Local_file.txt");
local_file = new FileOutputStream (fich_local);
String remote_file = new String (path + "/Remote_file.txt");
ftp.connect("SERVER");
reply = ftp.getReplyString();
System.out.println(reply);
ftp.login("USER","PASS");
reply = ftp.getReplyString();
System.out.println(reply);
ftp.setFileType(FTP.ASCII_FILE_TYPE);
reply = ftp.getReplyString();
System.out.println(reply);
ftp.changeWorkingDirectory(path);
reply = ftp.getReplyString();
System.out.println(reply);
reply = ftp.printWorkingDirectory();
System.out.println(reply);
success = ftp.retrieveFile(remote_file, local_file);
System.out.println("Status: " + success + " -- Remote File: " +
remote_file + " -- Local File: " + fich_local.getAbsolutePath ());
}
catch (FileNotFoundException fnfe)
{
fnfe.printStackTrace ();
}
catch (IOException ioe)
{
ioe.printStackTrace ();
}
catch (Exception e)
{
e.printStackTrace ();
}
The remote server, directory and file whithin is included the "Remote_file.txt"
exists, and the print line shows all this info if I catch the
"NullPointerException" (also shows a "false" when calling to the success
variable).
I have googled a lot (and still googling), but found almost nothing useful and
I would appreciate a lot any help (also if you need additional info, please let
me know).
Thanks in advance
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