URL: /documents/11518/11522/portal-ext.properties/4582d76c-093a-48e8-a8bb-dd7c72a545c8

import com.liferay.portlet.documentlibrary.service.DLAppServiceUtil;
import com.liferay.portal.kernel.repository.model.FileEntry;

FileEntry entry = DLAppServiceUtil.getFileEntryByUuidAndGroupId("4582d76c-093a-48e8-a8bb-dd7c72a545c8", 11518);

System.out.println(entry.getTitle());