FrankChen021 opened a new issue #12312:
URL: https://github.com/apache/druid/issues/12312
#12232 officially support JDK11.
But by staring Druid with JDK11 with the example configuration, we can see
an exception message as
```bash
2022-03-06T14:29:48,890 WARN [main]
org.apache.druid.java.util.metrics.AllocationMetricCollectors - Cannot
initialize org.apache.druid.java.util.metrics.AllocationMetricCollector
java.lang.reflect.InaccessibleObjectException: Unable to make public long[]
com.sun.management.internal.HotSpotThreadImpl.getThreadAllocatedBytes(long[])
accessible: module jdk.management does not "exports
com.sun.management.internal" to unnamed module @6d0b5baf
at
java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:340)
~[?:?]
at
java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:280)
~[?:?]
at java.lang.reflect.Method.checkCanSetAccessible(Method.java:198)
~[?:?]
at java.lang.reflect.Method.setAccessible(Method.java:192) ~[?:?]
at
org.apache.druid.java.util.metrics.AllocationMetricCollectors.<clinit>(AllocationMetricCollectors.java:41)
[druid-core-0.23.0-SNAPSHOT.jar:0.23.0-SNAPSHOT]
at
org.apache.druid.java.util.metrics.JvmMonitor.<init>(JvmMonitor.java:79)
[druid-core-0.23.0-SNAPSHOT.jar:0.23.0-SNAPSHOT]
at
org.apache.druid.java.util.metrics.JvmMonitor.<init>(JvmMonitor.java:70)
[druid-core-0.23.0-SNAPSHOT.jar:0.23.0-SNAPSHOT]
at
org.apache.druid.java.util.metrics.JvmMonitor.<init>(JvmMonitor.java:65)
[druid-core-0.23.0-SNAPSHOT.jar:0.23.0-SNAPSHOT]
```
Since `AllocationMetricCollector` is not correctly initialized, the metric
`jvm/heapAlloc/bytes` is not emitted.
## Solution
To fix this problem, we have to add following option to the JVM parameter
```bash
--add-exports jdk.management/com.sun.management.internal=ALL-UNNAMED
```
I think it's better for us to detect the JDK version and automatically add
above option to the JVM parameter in the shell(node.sh/run-druid) if current
JDK is JDK11+
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