Thread.currentThread().setContextClassLoader(oldClassLoader);
            legacySupport.setSession(oldSession);
        }
    }

    /**
     * TODO pluginDescriptor classRealm and artifacts are set as a side effect of this
     *      call, which is not nice.
     * @throws PluginResolutionException
     */
    public ClassRealm getPluginRealm(MavenSession session, PluginDescriptor pluginDescriptor)

        allOptionalSelectors.addAll(projectActivation.getRequiredActiveProjectSelectors());
        // We intentionally ignore the results of this method.
        // As a side effect it will log the optional projects that could not be resolved.
        projectSelector.getOptionalProjectsBySelectors(request, session.getAllProjects(), allOptionalSelectors);
    }

    /**

                    uniqueElements, hashCode, hashTable, hashTable.length - 1, size);
          } else {
            result = construct(size, contents);
            // construct has the side effect of deduping contents, so we update size
            // accordingly.
            size = result.size();
          }
          forceCopy = true;
          hashTable = null;
          return result;
      }