[Java] Problem to get current reservation of JVM direct memory on macOS Big Sur

Hi Team,

Just compiling [java dataset ](https://github.com/apache/arrow/tree/master/java/dataset)module it compile without problems but the test related to  get current reservation of JVM direct memory is failing on my local machine macOS Big Sur 11.5.2.

Command line:

 
```java

mvn -Darrow.cpp.build.dir=../java-dist/lib clean install
```
 

 

Test code:

 
```java

/**
* Get current reservation of jVM direct memory. Visible for testing.
*/
@VisibleForTesting
public long getCurrentDirectMemReservation() {
try {
final Class classBits = Class.forName("java.nio.Bits");
final Field f = classBits.getDeclaredField("reservedMemory");
f.setAccessible(true);
return ((AtomicLong) f.get(null)).get();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
```
 

 

Error message:

 
```java

[ERROR] testDirectReservationListener  Time elapsed: 0.028 s  <<< ERROR!
java.lang.RuntimeException: java.lang.NoSuchFieldException: reservedMemory
        at org.apache.arrow.dataset.jni.TestReservationListener.testDirectReservationListener(TestReservationListener.java:50)

```
 

 

If I changed from classBits.getDeclaredField("reservedMemory") to 

classBits.getDeclaredField("RESERVED_MEMORY") all the test finished without problems. Seeing this way to obtain reserved memory on [Jvm.java](https://github.com/OpenHFT/Chronicle-Core/blob/ea/src/main/java/net/openhft/chronicle/core/Jvm.java#L144).

 

Consider: Current test on macOS finished ok on the [ci workflows](https://github.com/ursacomputing/crossbow/runs/4987946390).

**Reporter**: [David Dali Susanibar Arce](https://issues.apache.org/jira/browse/ARROW-15834) / @davisusanibar

_{**Note**: *This issue was originally created as [ARROW-15834](https://issues.apache.org/jira/browse/ARROW-15834). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

Start with TestReservationListener.java around testDirectReservationListener and run the Maven command shown in the report on the affected macOS/JVM setup. Inspect the java.nio.Bits field used for the direct-memory reservation and verify the test also passes in the referenced CI workflow.

Scritto dal modello di indicizzazione a partire dal testo della issue.