jsp/java - session get item (with absolute path) (JSP)

import org.apache.sling.jcr.api.SlingRepository

import javax.jcr.Session

final SlingRepository repository = sling.getService(SlingRepository.class);
final Session adminSession = repository.loginAdministrative(null);

Node pageNode = (Node)adminSession.getItem(currentPage.getPath());

OR

final Session session = currentNode.getSession();