Moving an Issue between projects

I'm attempting to move an issue between jira core projects using code I've seen from others who claim success. So far I get to invoking MoveIssueUpdateFields doExecute() method, but get a null pointer exception with the following stack trace: 

java.lang.reflect.InvocationTargetException 
at ProjectIssueMove.moveIssueToAnotherProject(Script514.groovy:110)
at ProjectIssueMove$moveIssueToAnotherProject.call(Unknown Source) at Script514.run(Script514.groovy:41)

Caused by: java.lang.NullPointerException at com.atlassian.jira.web.action.issue.AbstractIssueSelectAction.readPrepopulatedIssueFromRequest(AbstractIssueSelectAction.java:124)
at com.atlassian.jira.web.action.issue.AbstractIssueSelectAction.getIssueResultFromRequestOrDatabase(AbstractIssueSelectAction.java:102)
at com.atlassian.jira.web.action.issue.AbstractIssueSelectAction.access$100(AbstractIssueSelectAction.java:30)
at com.atlassian.jira.web.action.issue.AbstractIssueSelectAction$IssueGetter.get(AbstractIssueSelectAction.java:519)
at com.atlassian.jira.web.action.issue.SelectedIssue.fetchIssueResult(SelectedIssue.java:85)
at com.atlassian.jira.web.action.issue.SelectedIssue.exists(SelectedIssue.java:73)
at com.atlassian.jira.web.action.issue.AbstractIssueSelectAction.isIssueExists(AbstractIssueSelectAction.java:60)
at com.atlassian.jira.web.action.issue.AbstractIssueSelectAction.assertIssueIsValid(AbstractIssueSelectAction.java:488)
at com.atlassian.jira.web.action.issue.AbstractIssueSelectAction.getIssueObject(AbstractIssueSelectAction.java:157)
at com.atlassian.jira.web.action.issue.MoveIssueUpdateFields.doExecute(MoveIssueUpdateFields.java:241)
... 3 more

 I can't seem to find what the null object is, any help would be greatly appreciated.

The following is the code used: 

import com.atlassian.core.ofbiz.util.CoreTransactionUtil
import com.atlassian.jira.bc.issue.comment.CommentService
import com.atlassian.jira.bc.issue.IssueService
import com.atlassian.jira.event.issue.IssueEventBundleFactory
import com.atlassian.jira.event.issue.txnaware.TxnAwareEventFactory
import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.config.ConstantsManager
import com.atlassian.jira.config.StatusManager
import com.atlassian.jira.config.properties.JiraSystemProperties
import com.atlassian.jira.issue.AttachmentManager
import com.atlassian.jira.issue.IssueFieldConstants
import com.atlassian.jira.issue.MutableIssue
import com.atlassian.jira.issue.issuetype.IssueType
import com.atlassian.jira.issue.security.IssueSecurityHelper
import com.atlassian.jira.project.Project
import com.atlassian.jira.project.ProjectManager
import com.atlassian.jira.web.SessionKeys
import com.atlassian.jira.web.action.issue.MoveIssueConfirm
import com.atlassian.jira.web.action.issue.MoveIssueUpdateFields
import com.atlassian.jira.web.bean.MoveIssueBean
import org.apache.log4j.Category
import org.apache.log4j.Logger
import org.apache.log4j.Level
import java.lang.reflect.Method
import webwork.action.ActionContext

//For testing one issue at a time//----------------------------------------
def user = ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser()
def issueService = ComponentAccessor.getComponentOfType(IssueService.class)
MutableIssue issue = issueService.getIssue(user,212961).getIssue() //enter issue id here
//-------------------------------------------------------------------------


ProjectIssueMove pim = new ProjectIssueMove()
String newProjectKey = "LN"
String issueType = issue.getIssueType().getName()
String statusName = issue.getStatus().getName()

pim.moveIssueToAnotherProject(newProjectKey,issueType,statusName,issue)


class ProjectIssueMove {
Category log = Category.getInstance(ProjectIssueMove.class)

public void moveIssueToAnotherProject(String newProjectKey, String newIssueType, String newStatusName, MutableIssue targetIssue) {

def log = Logger.getLogger("com.acme.CreateSubtask")
log.setLevel(Level.INFO)

MoveIssueBean moveIssueBean = new MoveIssueBean(ComponentAccessor.getConstantsManager(), ComponentAccessor.getProjectManager())
moveIssueBean.getFieldValuesHolder().put(IssueFieldConstants.PROJECT, getProjectFromKey(newProjectKey).id)
moveIssueBean.getFieldValuesHolder().put(IssueFieldConstants.ISSUE_TYPE, getTargetIssueType(newIssueType).id)
moveIssueBean.setIssueId(targetIssue.getId())
moveIssueBean.setTargetStatusId(getStatusToSet(newStatusName).id)
moveIssueBean.setSourceIssueKey(targetIssue.getKey())
moveIssueBean.setUpdatedIssue(targetIssue)

ActionContext.getSession().put(SessionKeys.MOVEISSUEBEAN, moveIssueBean)

MoveIssueUpdateFields moveIssueUpdateFields = new MoveIssueUpdateFields(
ComponentAccessor.getSubTaskManager(),
ComponentAccessor.getConstantsManager(),
ComponentAccessor.getWorkflowManager(),
ComponentAccessor.getFieldManager(),
ComponentAccessor.getFieldLayoutManager(),
ComponentAccessor.getIssueFactory(),
ComponentAccessor.getFieldScreenRendererFactory(),
ComponentAccessor.getComponentOfType(CommentService.class),
ComponentAccessor.getComponentOfType(IssueSecurityHelper.class),
ComponentAccessor.getUserUtil()
)

MoveIssueConfirm moveIssueConfirm = new MoveIssueConfirm(
ComponentAccessor.getSubTaskManager(),
ComponentAccessor.getComponentOfType(AttachmentManager.class),
ComponentAccessor.getConstantsManager(),
ComponentAccessor.getWorkflowManager(),
ComponentAccessor.getFieldManager(),
ComponentAccessor.getFieldLayoutManager(),
ComponentAccessor.getIssueFactory(),
ComponentAccessor.getFieldScreenRendererFactory(),
ComponentAccessor.getComponentOfType(CommentService.class),
ComponentAccessor.getComponentOfType(IssueSecurityHelper.class),
ComponentAccessor.getIssueManager(),
ComponentAccessor.getUserUtil(),
ComponentAccessor.getIssueEventManager(),
ComponentAccessor.getComponentOfType(IssueEventBundleFactory.class),
ComponentAccessor.getComponentOfType(TxnAwareEventFactory.class)
)

JiraSystemProperties.getInstance()
moveIssueUpdateFields.setId(targetIssue.getId())
Method privateUpdateFieldsDoExecute = MoveIssueUpdateFields.class.getDeclaredMethod("doExecute")
privateUpdateFieldsDoExecute.setAccessible(true)
privateUpdateFieldsDoExecute.invoke(moveIssueUpdateFields) //fails here
moveIssueConfirm.setId(targetIssue.getId())
Method privateIssueConfirmDoExecute = MoveIssueConfirm.class.getDeclaredMethod("doExecute")

privateIssueConfirmDoExecute.setAccessible(true)
privateIssueConfirmDoExecute.invoke(moveIssueConfirm)
CoreTransactionUtil.commit(true)

}
private Project getProjectFromKey(String projectKey) { //get the projectObject from a String key
ProjectManager projectManager = ComponentAccessor.getProjectManager()
return projectManager.getProjectObjByKeyIgnoreCase(projectKey)
}
def getStatusToSet(String statusName) { //find the status object from a status name
StatusManager statusManager = ComponentAccessor.getComponentOfType(StatusManager.class)
def statuses = statusManager.getStatuses()
def iterator = statuses.iterator()
while (iterator.hasNext()) {
def status = iterator.next()
if (status.getName() == statusName) {
return status
}
}
return null
}
def IssueType getTargetIssueType(String issueTypeName) { //Find the issue type object from a issue type name
ConstantsManager constantsManager = ComponentAccessor.getConstantsManager()
def issueTypes = constantsManager.getAllIssueTypeObjects()
def issuetypeiterator = issueTypes.iterator()
while (issuetypeiterator.hasNext()) {
def issueType = issuetypeiterator.next()
if (issueType.name.toLowerCase() == issueTypeName.toLowerCase()) {
return issueType
}
}
return null
}
}

Main Reference question:

 How-to-move-an-issue-programatically-to-a-different-project

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