dashorst opened a new issue, #1662:
URL: https://github.com/apache/wicket/issues/1662
In wicket-metrics, `WicketMetricsSettings` has
```java
public void startJmxReporter()
{
MetricRegistry metricRegistry = WicketMetrics.getMetricRegistry();
JmxReporter.forRegistry(metricRegistry).build().start();
}
public void stopJmxReporter()
{
MetricRegistry metricRegistry = WicketMetrics.getMetricRegistry();
JmxReporter.forRegistry(metricRegistry).build().stop();
}
```
`stopJmxReporter()` builds a new reporter and stops that one. The reporter
started by `startJmxReporter()` is never stopped, so its MBeans stay
registered, for example after the application is undeployed.
Proposed fix: keep the reporter created in `startJmxReporter()` in a field
and stop that instance in `stopJmxReporter()`.
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