class loading with "ftp" protocol fails
i can load a class using thefile protocol.
i cannot load the same class withftp
protocol.
this code works correctly:
String path ="/home/ftp/a.jar";
File dir =new File(path);
URL url = dir.toURL();
URL[] url_path =new URL[]{url};
URLClassLoader loader =new URLClassLoader(url_path);
Class c = loader.loadClass("hello");
now, if i change:
URL url = dir.toURL();
to
URL url =new URL("ftp://10.36.0.2/a.jar");
i getClassNotFoundException.
yet, to test the validity of theURL, i type:
ftp://10.36.0.2/a.jar
into a browser. and the file is found correctly.
myguess is that this is some kind of
security issue?
i have no security policy, so how can i disable it
if this is the problem?
thanks
[1144 byte] By [
suppona] at [2007-11-27 4:22:32]
# 2
i found it.
on the Linux machine i'm testing on, it seems that
the search path leads to using:
/usr/kerberos/bin/ftp
i am sorry for not checking this.
and this seems to make
URL url = new URL("ftp://10.32.0.5/a.jar");
fail because of some
encryption that kerberos ftp tries.
so, i wonder if there is any way Java can force the
use of a simple (ie. non-kerberos) ftp binary in a
platform independent way?
does not seem possible.
# 4
> It's not up to Java, it's up to the FTP host. You can
> probably control all that at the Linux end by
> reconfiguring FTP, don't ask me how. I would try
> using more of a path than just /a.jar, for a start.
i don't know what "using more of a path than just /a.jar" means.
if this is what you mean:
ftp://10.36.0.42/good_jars/a.jar
why is that better than:
ftp://10.36.0.42/a.jar
# 6
can someone please post code that shows how to do
ClassLoading without using the
http
file
ftp
protocols?
why can't i do network class loading without running an
http or ftp server?
i need my system to be "self-contained" and not
rely on 3rd party servers (especially ones that
run on priviledged ports).
what am i missing.
