Classloader problem, urgent! Please help.....

Question

I am working with a subcontractor. I have to use a class written by them. They give me a jar file namely subcontractor.jar, and together with a config.xml.
I have tested the jar file already and can perform well.
However, when I intergrate with them, fail exist....
I look up their code as following:
public class SomeWorks{
   public SomeWorks() throws Exception {
      URL url = (Parent.class).getClassLoader().getResource("config.xml");
      if(url == null){
         throw new Exception("Cannot find <config.xml> in CLASSPATH");
      } else{
         loadConfig(url.getFile());
         return;
}//end class
When I run their code alone, i.e. java Parent.doSomeThing , which in turn will call SomeWorks() . It can successfully load the config.xml file. The Parent class is the entry method, and the only one I can access. However, when I call it from my program:
import Parent.*;
public class MyOwnClass{
   public static void main(String[] args) {
      Parent.doSomeThing();
java -jar MyOwnClass.jar
in which i have my Manifest.mf :
Manifest-Version: 1.0
Main-Class: MyOwnClass
Class-Path: subcontractor.jar
I still get "Cannot find <config.xml> in CLASSPATH" error.
And it implies I successfully load their class.
The folder structure is:
C:\cronjob\MyOwnClass.jar
C:\cronjob\subcontractor.jar
C:\cronjob\config.xml
Why I can call it alone but not in my program?? I have tested almost all CLASSPATH setting.
set CLASSPATH=%CLASSPATH%;C:\cronjob\subcontractor.jar;C:\cronjob\config.xml
or
java -cp C:\cronjob\subcontractor.jar;C:\cronjob\config.xml -jar MyOwnClass.jar
But all not works..... And I cannot ask them to hardcode the full path..
Please help!!!

Answer 1

I think the classpath option can be added as I type java /? it lists out that -cp can be worked with -jar.Sure, you can put in the -cp option. But the plain fact is that an executable jar will ignore what you put there. Reply 4 by dpz is your answer. However...URL url = (Parent.class).getClassLoader().getResource("config.xml");
if(url == null){
  throw new Exception("Cannot find <config.xml> in CLASSPATH");
} else{
  loadConfig(url.getFile());
  return;
}The first line of this code is correct for finding config.xml in your classpath (although you might have to use "/config.xml" if your code is in a package). But later you are extracting only the "file" part of that URL. If you put your config.xml file into a jar, the URL is going to be more complex than that, so getFile() is probably not going to work. I don't know what will work, though, because I don't know anything about the loadConfig() method and what it's expecting. The ideal situation would be if it had an overloaded version that took an InputStream.