With JIRA 7 the "ComponentManager" is removeddeprecated, use "ComponentAccessor" instead - the Scripts below wont work on JIRA 7

As per ScriptRunner 4.2.0.4 there is a bug in the embedded groovy, so scriptfiles can contain Hyphens "-"

.

With JIRA 8 the "ComponentManager" is removed, use "ComponentAccessor" instead.Do notice the Issue List is rather long and with some old problems still open

import com.atlassian.jira.ComponentAccessor
import com.atlassian.jira.issue.customfields.manager.OptionsManager
import com.atlassian.jira.issue.CustomFieldManager
 
componentManager (componentManager) ComponentAccessor.getComponentManager();

optionsManager = (optionsManager) ComponentAccessor.getOptionsManager();
customFieldManager customFieldManager = ComponentAccessor.getCustomFieldManager();
def cf = customFieldManager.getCustomFieldObjects(issue).find {it.name == 'Task Type'}
def fieldConfig = cf.getRelevantConfig(issue)
def optionClone = optionsManager.getOptions(fieldConfig).find {it.value == "Clone"}
issue.setCustomFieldValue(cf, optionClone)

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.link.IssueLink;
import com.atlassian.jira.issue.link.IssueLinkManager
import com.atlassian.jira.issue.Issue
import org.apache.log4j.Category

IssueLinkManager issueLinkManager = ComponentAccessor.getIssueLinkManager();

String IssueType      = issue.getIssueType().name
String ProjectName    = issue.getProjectObject().name
String IssueKey       = issue.key
passesCondition = true

System.out.println("script=CheckTOPSLinkStatus.groovy Issuekey: " + IssueKey + " IssueType: " + IssueType + " ProjectName: " + ProjectName + " action=StartScript")

//Traverse all links
issueLinkManager.getOutwardLinks(issue.id)?.each {issueLink ->
   String LinkTypeName    = issueLink.issueLinkType.name
   String LinkStatus      = issueLink.getDestinationObject().getStatus().name
   String LinkIssueKey    = issueLink.getDestinationObject().key
   System.out.println("script=CheckTOPSLinkStatus.groovy Issuekey: " + IssueKey + " Issue Link key: " + LinkIssueKey + " Issue Link Type: " + LinkTypeName + " Linked Issue Status: " + LinkStatus)
   if (LinkTypeName == "Awaiting")
   {
        passesCondition = false
        System.out.println("script=CheckTOPSLinkStatus.groovy Issuekey: " + IssueKey + " IssueType: " + IssueType + " ProjectName: " + ProjectName + " action=Hide Transition")
   }
}
System.out.println("script=CheckTOPSLinkStatus.groovy Issuekey: " + IssueKey + " IssueType: " + IssueType + " ProjectName: " + ProjectName + " action=EndScript")

issue.assignee == transientVars["issue"].assignee;
issue.setAssignee(null);
issue.setDescription("A new Description");
issue.setSummary("Unit Test - " + transientVars["issue"].key);

import com.atlassian.jira.ComponentAccessor;
import com.atlassian.jira.issue.fields.CustomField;
import com.atlassian.jira.issue.CustomFieldManager;
customFieldManager customFieldManager = ComponentAccessor.getCustomFieldManager();
CustomField UseCustomer = customFieldManager.getCustomFieldObject(10600);

System.out.println("Custom field value: " + issue.getCustomFieldValue(UseCustomer));

String userName="pho"
def userManager = ComponentAccessor.getUserManager()
def user = userManager.getUserObject(userName)
issue.setAssignee(user)

//Update the issue - may not be nessesary
ComponentManager.getInstance().getIssueManager().updateIssue(ComponentManager.getInstance().jiraAuthenticationContext?.user, issue, EventDispatchOption.DO_NOT_DISPATCH, false)
ComponentManager.getInstance().getIndexManager().reIndex(issue);

import com.atlassian.jira.ComponentAccessor;
import com.atlassian.jira.security.Permissions;
import com.atlassian.jira.event.type.EventDispatchOption
import com.atlassian.jira.util.ImportUtils
 
//Examples, 8 is my subtask issue type id. Will be different for others
updateAssignee("PRJ-1485", "user1")
 
//Method to do all the work
def updateAssignee(parentId, userName) {
def issue = ComponentAccessor.getIssueManager().getIssueObject(parentId)
def userManager = ComponentAccessor.getUserManager()
def user = userManager.getUserObject(userName)
issue.setAssignee(user)
//Update the issue
ComponentAccessor.getIssueManager().updateIssue(ComponentAccessor.jiraAuthenticationContext?.user, issue, EventDispatchOption.DO_NOT_DISPATCH, false)
ComponentAccessor.getIndexManager().reIndex(issue);
}

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.link.IssueLink;

def issueLinkManager = ComponentAccessor.getIssueLinkManager()

import org.apache.log4j.Category
import com.atlassian.jira.issue.comments.CommentManager
import com.opensymphony.workflow.WorkflowContext
import com.atlassian.jira.workflow.WorkflowTransitionUtil;
import com.atlassian.jira.workflow.WorkflowTransitionUtilImpl;
import com.atlassian.jira.util.JiraUtils;

def Category log = Category.getInstance("com.onresolve.jira.groovy.PostFunction")
log.setLevel(org.apache.log4j.Level.DEBUG)
log.debug "debug statements"

String currentUser = ((WorkflowContext) transientVars.get("context")).getCaller();
WorkflowTransitionUtil workflowTransitionUtil = ( WorkflowTransitionUtil ) JiraUtils.loadComponent( WorkflowTransitionUtilImpl.class );


issueLinkManager.getOutwardLinks(issue.id)?.each {issueLink ->
        if (issueLink.issueLinkType.name == "parent-child") {
        // Transist Issue
                workflowTransitionUtil.setIssue(issueLink.getDestinationObject());
                workflowTransitionUtil.setUsername(currentUser);
                workflowTransitionUtil.setAction (741)    // 741 = Waiting
        // validate and transition issue
                workflowTransitionUtil.validate();
                workflowTransitionUtil.progress();
        // Add a comment so people have a clue why the child has been closed
                CommentManager commentManager = (CommentManager) ComponentAccessor.getCommentManager();
                String comment = "Status changed to *WAit for solution* as a result of the *Resolve* action being applied to the TD Issue.";
                commentManager.create(issueLink.getDestinationObject(), currentUser, comment, true);
       }
}

import com.atlassian.jira.issue.Issue;
import com.atlassian.jira.ComponentManager;
User = ComponentAccessor.getJiraAuthenticationContext().getUser().getName();

// This script makes a requirement: if the Custom Field "OprStatusShow" is set to public, Incident Start and Resolved must be set.

import com.opensymphony.workflow.InvalidInputException
import com.atlassian.jira.project.ProjectManager
import com.atlassian.jira.issue.CustomFieldManager
import com.atlassian.jira.issue.fields.CustomField

//Project "Support" Id = 10130
if (issue.getProjectObject().getId() == 10130) {

CustomFieldManager customFieldManager = ComponentAccessor.getCustomFieldManager();
CustomField IncidentResolvedField = customFieldManager.getCustomFieldObject("customfield_12224");
CustomField IncidentStartField = customFieldManager.getCustomFieldObject("customfield_10091");
CustomField OprStatusShowField = customFieldManager.getCustomFieldObject("customfield_11820");


String IncidentResolved = (String)issue.getCustomFieldValue(IncidentResolvedField);
String IncidentStart = (String)issue.getCustomFieldValue(IncidentStartField);
String OprStatusShow = (String)issue.getCustomFieldValue(OprStatusShowField);

if (OprStatusShow == "Yes") {

	if (IncidentStart == null || IncidentResolved == null) {
		InvalidInputException e= new InvalidInputException();
		e.addError("Incident Start And Incident Resolved must not be empty");
	 	throw e;
		}
	}
}