code: public static Object getServiceByFilter( BundleContext bc, String ldapFilter )
      {
          return getServiceByFilter( bc, ldapFilter, DEFAULT_TIMEOUT );
      }
docs: Returns a service matching the given filter.
  
  @param bc bundle context for accessing the OSGi registry
  @param ldapFilter LDAP filter to be matched by the service. The class name must be part of the
  filter.
  @return matching service (not null)
  @throws ServiceLookupException when no matching service has been found after the default
  timeout