problem fails when class is inside package but works when inside

[northfield]

I have a class FtpExample that calls a bean.
However for some reason when I package this class
as part of the "ftp" folder and I run the program it always gives me errors. Please note in the example FtpExample is inside a folder called "ftp".

Below is error:

C:\java-coding\ftpbean\FTP>java FtpExample
Exception in thread "main" java.lang.NoClassDefFoundError: FtpExample (wrong nam
e: ftp/FtpExample)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:509)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
3)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:246)
at java.net.URLClassLoader.access$100(URLClassLoader.java:54)
at java.net.URLClassLoader$1.run(URLClassLoader.java:193)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:186)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)
at java.lang.ClassLoader.loadClass(ClassLoader.java:262)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:322)

C:\java-coding\ftpbean-package-Example-inside\FTP>


It is strange the error is not given when I run the FtpExample class outside of the "ftp" package.
and thus instead of

package ftp;

I have statement

import ftp.*;

I want to use the "FtpExample.java" class inside the ftp package.

package ftp;

class FtpExample implements FtpObserver
{
    FtpBean ftp;
    long num_of_bytes = 0;

    public FtpExample()
    {
        // Create a new FtpBean object.
        ftp = new FtpBean();
    }

    // Connect to a ftp server.
    public void connect()
    {
        try
        {
            ftp.ftpConnect("whale.wxx.ac.uk", "w***", "****");
        } catch(Exception e)
        {
            System.out.println(e);
        }
    }

    // Close connection
    public void close()
    {
        try
        {
            ftp.close();
        } catch(Exception e)
        {
            System.out.println(e);
        }
    }

    // Go to directory pub and list its content.
    public void listDirectory()
    {
        FtpListResult ftplrs = null;

        try
        {
            // Go to directory 
            ftp.setDirectory("/home/eland/u6/k3074/w0109699/simple-bean");
            // Get its directory content.
            ftplrs = ftp.getDirectoryContent();
        } catch(Exception e)
        {
            System.out.println(e);
        }

        // Print out the type and file name of each row.
        while(ftplrs.next())
        {
            int type = ftplrs.getType();
            if(type == FtpListResult.DIRECTORY)
                System.out.print("DIR\t");
            else if(type == FtpListResult.FILE)
                System.out.print("FILE\t");
            else if(type == FtpListResult.LINK)
                System.out.print("LINK\t");
            else if(type == FtpListResult.OTHERS)
                System.out.print("OTHER\t");
            System.out.println(ftplrs.getName());
        }
    }

    // Get the file.
    public void getFile()
    {
        try
        {
            // Get the binary file and save it to
            // the name 'local_file_name' in the hard disk.
              ftp.getBinaryFile("accessbean.jsp", "local_file_name", this);
        } catch(Exception e)
        {
            System.out.println(e);
        }
    }

    // Implemented for FtpObserver interface.
    // To monitor download progress.
    public void byteRead(int bytes)
    {
        num_of_bytes += bytes;
        System.out.println(num_of_bytes + " of bytes read already.");
    }

    // Needed to implements by FtpObserver interface.
    public void byteWrite(int bytes)
    {
    }

    // Main
    public static void main(String[] args)
    {
        FtpExample example = new FtpExample();
        example.connect();
        example.listDirectory();
        example.getFile();
        example.close();
    }
}

[godcomplex]

When using a class within a package it is necessary to inclue its package name when launching it. Instead of java FtpExample, try java ftp.FtpExample.

-gc

[northfield]

thanks