jeqo commented on a change in pull request #9078:
URL: https://github.com/apache/kafka/pull/9078#discussion_r519741816
##########
File path:
clients/src/main/java/org/apache/kafka/common/metrics/JmxReporter.java
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@@ -272,8 +272,16 @@ public MBeanInfo getMBeanInfo() {
for (Map.Entry<String, KafkaMetric> entry :
this.metrics.entrySet()) {
String attribute = entry.getKey();
KafkaMetric metric = entry.getValue();
+ String metricType = double.class.getName();
+
+ try {
+ metricType = metric.metricValue().getClass().getName();
+ } catch (NullPointerException e) {
Review comment:
@rgroothuijsen this could be a bug on the DistributedHerder side. Seems
that `DistributedHerder#herderMetrics` is initialized [too
early](https://github.com/apache/kafka/blob/8e211eb72f9a45897cc37fed394a38096aa47feb/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/DistributedHerder.java#L216).
Could you give a try moving it later in the constructor, [maybe after
config](https://github.com/apache/kafka/blob/8e211eb72f9a45897cc37fed394a38096aa47feb/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/DistributedHerder.java#L249),
to check if the same exception happens again?
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