code: private <T> T resolveResource(final String resourcePath, final Class<T> targetType) {
          Resource absoluteResource = this.resource.getResourceResolver().getResource(this.resource, resourcePath);
          return convert(absoluteResource, targetType);
      }
docs: Uses the current resource's {@link org.apache.sling.api.resource.ResourceResolver}
  to obtain the resource with the given path.
  The path can be absolute or relative to the current resource.
  {@link #convert(org.apache.sling.api.resource.Resource, Class) Converts} the resolved resource
  to the given field type if necessary.
  
  @return the resolved and converted resource, or <code>null</code>.