import com.liferay.document.library.kernel.model.DLFileVersion;
import com.liferay.document.library.kernel.service.DLFileVersionLocalServiceUtil;
import com.liferay.portal.kernel.workflow.WorkflowConstants;

long dlFileEntryId = 36675;

List<DLFileVersion> dlFileVersions = DLFileVersionLocalServiceUtil.getFileVersions(dlFileEntryId, WorkflowConstants.STATUS_ANY);

println("DL File Versions Size = " + dlFileVersions.size());

int dlFileVersionsCount = DLFileVersionLocalServiceUtil.getFileVersionsCount(dlFileEntryId, WorkflowConstants.STATUS_ANY);

println("DL File Versions Count = " + dlFileVersionsCount);