JIRA: https://jira.spring.io/browse/INT-3898 Some XML validator like `xercesImpl` doesn't allow `minOccurs` and `maxOccurs` on the `<xsd:all`. * Remove them in favor of `minOccurs`/`maxOccurs` on the nested elements. * Add `<poller>` for the `<int-jmx:notification-publishing-channel-adapter>`