I have a Spring Controller that is being invoked via an HTTP POST from
the GAE Queue Scheduler.
@Controller
@RequestMapping(value = RSSPoller.RSS_POLLER_URL)
public class RSSPoller implements Serializable {
private static final long serialVersionUID = -4925178778477404709L;
public static final String RSS_POLLER_URL = "/rsspoller";
@RequestMapping(method = RequestMethod.POST)
@ResponseStatus(HttpStatus.OK)
public void pollAndProcessRssFeed() throws ServiceException {
try {
// do some stuff
}
catch(Exception e) {
throw new ServiceException("Can't process RSS feed because", e);
}
}
}
However when it gets invoked, the response code is 500 with a Critical
log message of
Uncaught exception from servlet
java.lang.RuntimeException: java.io.NotSerializableException: <some
spring class that changes all the time, but does not implement
java.io.Serializable>
The same log message shows up in the logs with a Warning level as well.
I get similar warning messages (but not critical) in my logs when I
invoke other Spring Controllers that either render a web page (GET), or
returns some XML data (essentially RPC invokes which use HTTP POST).
When I do an HTTP GET/POST to those URLs, the response code is 200 and
the output is correct (and I ignore the warning message in the logs).
That leads me to two questions:
1. Why do I get the Critical error message/HTTP 500 for the POST
from the queue, but not the GET/POST to other Spring Controllers in my app?
2. How can I trap the exception and essentially discard it; as to my
purposes the task is complete.
I can post the full exception log if it's of use; for brevity I've
omitted it.
Thanks in advance
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