How set date in custom field value in Issue Create event

[aas]

Hello everybody. I try to make Script Listener, which in the time of issue creation set in custom field time which is created time + 2 hours

import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.event.type.EventDispatchOption
import com.atlassian.jira.issue.IssueManager
import com.atlassian.jira.issue.MutableIssue
import java.sql.Timestamp

def createTime = event.issue.created
log.warn("Created at : " + createTime)

def cfManager = ComponentAccessor.getCustomFieldManager()
def cfField = cfManager.getCustomFieldObject("customfield_34850")
def fieldValue = event.issue.getCustomFieldValue(cfField)


def newTime = new Timestamp(createTime.time)
Long duration = ((120 * 60) + 00) * 1000;
newTime.setTime(newTime.getTime() + duration);

MutableIssue issueToUpdate = (MutableIssue) event.issue
issueToUpdate.setCustomFieldValue(cfField, newTime)
IssueManager issueManager = ComponentAccessor.getIssueManager()
issueManager.updateIssue(event.getUser(), issueToUpdate, EventDispatchOption.ISSUE_UPDATED, false)

 But have error in last line 

java.lang.String cannot be cast to java.util.Date 

Where have I made mistake?

[Leonard Chew · Accepted solution]

Hi aas

Try this:

def newTime = event.issue.created
def newHours = event.issue.created.getHours() + 2
newTime.setHours(newHours)

It also works if the hours pass midnight (new day is set).

[aas]

There is no mistake in code. It's just need that custom field has some value by default. Then script works properly.