The finder interface is defainged as:

package org.apache.avalon.finder;

/**
 * Defintion of the Finder service contract.
 */
public interface Finder
{
   /**
    * Find an object fullfilling the supplied service class.
    * 
    * @param service the service class that the returned 
    *    object if gauranteed to fulfill
    * @exception FinderException if a provider could not be found
    */
    Object find( Class service ) throws FinderException;

   /**
    * Release an object that was resolved using the find operation.
    * 
    * @param object the object to release
    */
    void release( Object object );
}