MissingResourceException when I iterator a collection after closing the PM

Question

I retrieve a collection, call pm.retrieveAll on it, and then close the PM.
When I try to iterator over the collection, I get a
MissingResourceException. I can't figure out why I'm getting the exception,
if I do a retrieveAll it should retrieve all the fields of all the objects
in the collection. It's as if there is a rule "Thou shall not iterator over
a collection after closing the PM". Is this true?
java.util.MissingResourceException: Can't find resource for bundle
java.util.PropertyResourceBundle, key resultlist-closed
at java.util.ResourceBundle.getObject(ResourceBundle.java:314)
at java.util.ResourceBundle.getString(ResourceBundle.java:274)
at serp.util.Localizer.get(Localizer.java:270)
at serp.util.Localizer.get(Localizer.java:121)
at
com.solarmetric.kodo.impl.jdbc.runtime.LazyResultList.checkClosed(LazyResult
List.java:349)
at
com.solarmetric.kodo.impl.jdbc.runtime.LazyResultList.listIterator(LazyResul
tList.java:403)
at
com.solarmetric.kodo.impl.jdbc.runtime.LazyResultList.iterator(LazyResultLis
t.java:397)
at
com.verideon.siteguard.services.SchedulerService.getMonitorsToRun(SchedulerS
ervice.java:103)
at
com.verideon.siteguard.services.SchedulerService.schedule(SchedulerService.j
ava:59)
at
com.verideon.siteguard.web.util.TimerServlet$scheduleTask.run(TimerServlet.j
ava:84)
at java.util.TimerThread.mainLoop(Timer.java:432)
at java.util.TimerThread.run(Timer.java:382)
Here is my code:
private Collection getMonitorsToRun() {
Collection c = new LinkedList();
PersistenceManager pm = null;
try {
pm = JDOFactory.getPersistenceManager();
Extent extent = pm.getExtent(Monitor.class, true);
String filter = "nextDate <= now";
Query q = pm.newQuery(extent, filter);
q.declareParameters("java.util.Date now");
q.setOrdering("nextDate ascending");
Hashtable p = new Hashtable();
p.put("now", new Date());
c = (Collection) q.executeWithMap(p);
pm.retrieveAll(c);
} catch (JDOException e) {
log.warn("Received JDO Exception while retrieving Monitors " + e);
} finally {
pm.close();
log.debug("Retrieved " + c.size() + " Monitors ready to be ran.");
Iterator i = c.iterator();
while (i.hasNext()) {
Monitor m = (Monitor) i.next();
log.debug("m id = " + m.getId());
return c;

Answer 1

It appears to be a query in which case, yes, a Query result Collection cannot be iterated over.
The simple way to bypass this is to transfer the results to a non-closing Collection.
Collection results = (Collection) q.execute ();
results = new LinkedList (results);
pm.retrieveAll (results);
pm.close ();
On Thu, 27 Feb 2003 14:49:17 +0100, Michael Mattox wrote:
I retrieve a collection, call pm.retrieveAll on it, and then close the PM.
When I try to iterator over the collection, I get a
MissingResourceException. I can't figure out why I'm getting the exception,
if I do a retrieveAll it should retrieve all the fields of all the objects
in the collection. It's as if there is a rule "Thou shall not iterator over
a collection after closing the PM". Is this true?
java.util.MissingResourceException: Can't find resource for bundle
java.util.PropertyResourceBundle, key resultlist-closed
at java.util.ResourceBundle.getObject(ResourceBundle.java:314)
at java.util.ResourceBundle.getString(ResourceBundle.java:274)
at serp.util.Localizer.get(Localizer.java:270)
at serp.util.Localizer.get(Localizer.java:121)
at
com.solarmetric.kodo.impl.jdbc.runtime.LazyResultList.checkClosed(LazyResult
List.java:349)
at
com.solarmetric.kodo.impl.jdbc.runtime.LazyResultList.listIterator(LazyResul
tList.java:403)
at
com.solarmetric.kodo.impl.jdbc.runtime.LazyResultList.iterator(LazyResultLis
t.java:397)
at
com.verideon.siteguard.services.SchedulerService.getMonitorsToRun(SchedulerS
ervice.java:103)
at
com.verideon.siteguard.services.SchedulerService.schedule(SchedulerService.j
ava:59)
at
com.verideon.siteguard.web.util.TimerServlet$scheduleTask.run(TimerServlet.j
ava:84)
at java.util.TimerThread.mainLoop(Timer.java:432)
at java.util.TimerThread.run(Timer.java:382)
Here is my code:
private Collection getMonitorsToRun() {
Collection c = new LinkedList();
PersistenceManager pm = null;
try {
pm = JDOFactory.getPersistenceManager();
Extent extent = pm.getExtent(Monitor.class, true);
String filter = "nextDate <= now";
Query q = pm.newQuery(extent, filter);
q.declareParameters("java.util.Date now");
q.setOrdering("nextDate ascending");
Hashtable p = new Hashtable();
p.put("now", new Date());
c = (Collection) q.executeWithMap(p);
pm.retrieveAll(c);
} catch (JDOException e) {
log.warn("Received JDO Exception while retrieving Monitors " + e);
} finally {
pm.close();
log.debug("Retrieved " + c.size() + " Monitors ready to be ran.");
Iterator i = c.iterator();
while (i.hasNext()) {
Monitor m = (Monitor) i.next();
log.debug("m id = " + m.getId());
return c;
Stephen Kim
[email protected]
SolarMetric, Inc.
http://www.solarmetric.com