Getting java.lang.ClassCastException: java.util.HashMap cannot be cast in jira5

[Ramesh Udari1]

We are upgrading jira form 4.3 to 5.0.2 and while migrating existing plugin we are getting ClassCastException exception when we use the below code.

CustomField customField = customFieldManager.getCustomFieldObjectByName(customfieldName);

CustomFieldParams cfParams = (CustomFieldParams)customField.getValue(mutableIssue);

Object value1 = cfParams.getFirstValueForKey(null);
					Object value2 = cfParams.getFirstValueForKey("1");
					strValue1 = value1.toString();
					if(value2 != null)
					{
						strValue2 = value2.toString();
					}

Exception:2012-11-05 17:09:01,961 http-8080-Processor19 INFO ramesh.udari 1029x133x1 y6s6ee 172.17.6.206 /secure/ConfigureReport.jspa [helpdesk.plugin.manager.DatabaseConnection] .......................Connection Successful FOr TAT!
java.lang.ClassCastException: java.util.HashMap cannot be cast to com.atlassian.jira.issue.customfields.view.CustomFieldParams

[Florin Manaila]

I'm assuming this is about a cascading select custom field. Jira 5 has changed its internal representation from CustomFieldParamsImpl to a HashMap (they have similar methods). You will find the values in the new HashMap implementation similar to what it used to be in CustomFieldParamsImpl.

map.get(CascadingSelectCFType.PARENT_KEY) // parent key is null

map.get(CascadingSelectCFType.CHILD_KEY) // child key is "1"

So line 3 in your code should actually cast to a HashMap and use it as I said above.