Обсуждение: Puzzling Unix CLASSPATH issue...

I recently upgrade from Postgresql 7.3 to 7.4. Of course, I am using the
new jdbc driver.

When I log into my Unix machine under one account, the driver works
great and I connect to the database with no trouble. When I log into the
machine under a different user, I get a ClassNotFoundException.

I've examined my postgresql configuration, permissions, etc., and it
appears to be identical to my 7.3 config, which worked fine.

Any ideas on what is happening? Thanks...

Simple test case follows:

--------- DataBase.java --------
import java.io.*;
import java.sql.*;

public class DataBase
{
   public static void main(String args[])
   {
      try {
         Class.forName("org.postgresql.Driver");
      } catch (ClassNotFoundException cnfe) {
         System.err.println("Couldn't find driver class:");
         cnfe.printStackTrace();
      }

      System.out.println("Testing");
   }
}

-------- Example of problem -------

chris:~/test> export CLASSPATH=/usr/local/jdk1.4.2/jre/lib/rt.jar:.:pg74.214.jdbc3.jar; java DataBase
Testing
chris:~/test> su fred
Password:
fred:/home/chris/test> export CLASSPATH=/usr/local/jdk1.4.2/jre/lib/rt.jar:.:pg74.214.jdbc.jar; java DataBase
Couldn't find driver class:
java.lang.ClassNotFoundException: org.postgresql.Driver
        at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:141)
        at DataBase.main(DataBase.java:11)
Testing
fred:/home/chris/test>

--
Christopher Farley
www.northernbrewer.com

Christopher Farley wrote:

> chris:~/test> export CLASSPATH=/usr/local/jdk1.4.2/jre/lib/rt.jar:.:pg74.214.jdbc3.jar; java DataBase
> Testing
> chris:~/test> su fred
> Password:
> fred:/home/chris/test> export CLASSPATH=/usr/local/jdk1.4.2/jre/lib/rt.jar:.:pg74.214.jdbc.jar; java DataBase
> Couldn't find driver class:
> java.lang.ClassNotFoundException: org.postgresql.Driver

Check the permissions on the driver jarfile; perhaps it is not readable
as 'fred'.

-O

Oliver Jowett (oliver@opencloud.com) wrote:

> Check the permissions on the driver jarfile; perhaps it is not readable
> as 'fred'.

Wow, thank you. One of the first things I did was check the permissions,
and I believed they were right. I didn't really look at them again until
I read your message. Thank you... now I can go to sleep!

--
Christopher Farley
www.northernbrewer.com