get the transition name in Jira listener

I am using use a listener in Jira to execute some code if a specific transition was made. I need to retrieve the transition name to only fire the event if the transition is called "MounaTransition". It seems that the following code is not working to get the transition name in the listener. 

 import com.atlassian.jira.component.ComponentAccessor def workflow = ComponentAccessor.getWorkflowManager().getWorkflow(issue) def wfd = workflow.getDescriptor() def actionName = wfd.getAction(transientVars["actionId"] as int).getName()

 Here is the code I have written so far in my listener to try to do the same thing that I was doing with the custom post function before. Any idea on how to get the transition name/ID? I can only operate and execute my script if the tranition name matches the one I am interested in. 

import org.ofbiz.core.entity.GenericValueimport com.opensymphony.workflow.WorkflowContextimport com.atlassian.jira.issue.Issue;import java.util.List;import org.apache.log4j.Logger;import com.atlassian.jira.issue.ModifiedValue;import com.atlassian.jira.issue.fields.CustomField;import com.atlassian.jira.component.ComponentAccessorimport org.ofbiz.core.entity.GenericDelegator;import com.atlassian.jira.issue.changehistory.ChangeHistoryManager;import com.atlassian.jira.issue.history.ChangeItemBean;import com.atlassian.jira.issue.comments.Commentimport com.atlassian.jira.workflow.JiraWorkflowimport com.atlassian.jira.workflow.WorkflowManagerimport com.atlassian.jira.issue.changehistory.ChangeHistoryItemimport com.onresolve.scriptrunner.runner.util.UserMessageUtilimport com.atlassian.jira.config.SubTaskManagerimport com.atlassian.jira.issue.Issueimport com.atlassian.jira.issue.link.LinkCollectionImpl;import com.atlassian.jira.issue.link.IssueLink;import com.atlassian.crowd.embedded.api.User;import com.atlassian.jira.issue.comments.CommentManager;import com.atlassian.jira.issue.link.IssueLinkManager;import com.atlassian.jira.user.ApplicationUser;import com.atlassian.jira.util.ErrorCollection;import com.atlassian.jira.util.JiraUtils;import com.atlassian.jira.workflow.JiraWorkflow;import com.atlassian.jira.workflow.WorkflowManager;import com.atlassian.jira.workflow.WorkflowTransitionUtil;import com.atlassian.jira.workflow.WorkflowTransitionUtilImpl;import com.atlassian.jira.workflow.function.issue.AbstractJiraFunctionProvider;import com.opensymphony.module.propertyset.PropertySet;import com.opensymphony.workflow.WorkflowException;import com.opensymphony.workflow.loader.StepDescriptor;import com.opensymphony.workflow.spi.SimpleStep;import com.atlassian.jira.config.ConstantsManagerimport com.atlassian.jira.workflow.ImmutableWorkflowDescriptorimport com.atlassian.jira.web.action.admin.workflow.ViewWorkflowStepimport com.opensymphony.workflow.loader.ActionDescriptorimport com.atlassian.jira.issue.IssueInputParametersImplimport com.atlassian.jira.issue.IssueInputParametersimport com.atlassian.jira.bc.issue.IssueService.IssueValidationResultimport com.atlassian.jira.user.ApplicationUserimport com.atlassian.jira.workflow.WorkflowTransitionUtilimport com.atlassian.jira.workflow.WorkflowTransitionUtilFactoryimport com.atlassian.jira.workflow.TransitionOptionsimport com.atlassian.jira.bc.issue.IssueServiceimport com.atlassian.jira.bc.issue.IssueService.TransitionValidationResultimport com.atlassian.event.Eventimport com.atlassian.jira.event.issue.AbstractIssueEventListener;import com.atlassian.jira.event.issue.IssueEvent;def log = Logger.getLogger("atlassian-jira.log")log.warn("This is the last action ")Issue issue = event.getIssue(); log.warn("CAM 0 ") log.warn("CAM 0.1 ")//Get worklflowname By actionId  GenericValue changeLog = event.getChangeLog();         log.warn("HERE 1")         List<GenericValue> changeItems = ComponentAccessor.getChangeHistoryManager().getAllChangeItems(issue)        //  changeItems = changeLog.internalDelegator.findByAnd("ChangeItem", fields);        //changeItems = changeLog         log.warn("HERE 5::: "+ changeItems)     log.warn("MOUNA IS HERE AFTER HERE 5 " +changeItems.size());     log.warn("VALUES 1");    int lastIndex= changeItems.size()-1;  log.warn("CAM 0.2") ChangeHistoryItem value= changeItems.get(lastIndex) as ChangeHistoryItem;  def workflow = ComponentAccessor.getWorkflowManager().getWorkflow(issue)def wfd = workflow.getDescriptor()    log.warn("GENERIC VALUE "+ transientVars["actionId"] +" ");def actionName = wfd.getAction(transientVars["actionId"] as int).getName()    log.warn("GENERIC VALUE "+ actionName +" ");