Why getResource of jar in classpath returns null?

Question

When i iterate through the jars in the classpath and try to turn them into URL's via the getResources(), they all return null. What am I doing wrong?
(NOTE: It does print out the classpath properly when i print that out)
String classPath = System.getProperty( "java.class.path" );
String delim = System.getProperty( "path.separator" );
String[] locations = classPath.split( delim );
for ( int i = 0; i < locations.length; i++ )
      /* ** It doesn't work with either of these statments: ** */
      //This one tries the full path (e.g. /home/me/test/some.jar)
      //Enumeration en = getClass().getClassLoader().getResources( locations[ i ].substring( locations[ i ] );
      //This one tries to use just the local name of the jar (e.g. test.jar)
      Enumeration en = getClass().getClassLoader().getResources( locations[ i ].substring( locations[ i ].lastIndexOf( '/' ) + 1 ) );
      //This just prints null
      while (  en.hasMoreElements(); ) System.out.println( en.nextElement() );
}Edited by: 6tr6tr on Dec 4, 2008 5:46 PM
Edited by: 6tr6tr on Dec 4, 2008 5:47 PM

Answer 1

What you are doing doesn't make sense. The resource locations within a JAR file are relative to the package directory structure within the JAR file, not to its own absolute location on the disk. And you seem to be expecting to retrieve a JAR file from within a JAR file. This makes no sense either.