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

从 TestReservationListener.java 中 testDirectReservationListener 附近开始，并在受影响的 macOS/JVM 设置上运行报告中显示的 Maven 命令。检查用于直接内存预留的 java.nio.Bits 字段，并验证测试在所引用的 CI 工作流中也能通过。

Hi Team,

Just compiling 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:

 

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

 

 

Test code:

 

/**
 * 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:

 

[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.

 

Consider: Current test on macOS finished ok on the ci workflows.

Reporter: David Dali Susanibar Arce / @davisusanibar

_{Note: This issue was originally created as ARROW-15834. Please see the migration documentation for further details.}