[GitHub] [bookkeeper] Shoothzj commented on a diff in pull request #3252: [ISSUE 2637] Fix jvm_memory_direct_bytes_used metrics when using jdk11+

[GitBox <gi...@apache.org>]

Shoothzj commented on code in PR #3252:
URL: https://github.com/apache/bookkeeper/pull/3252#discussion_r861573603


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stats/bookkeeper-stats-providers/prometheus-metrics-provider/src/main/java/org/apache/bookkeeper/stats/prometheus/PrometheusMetricsProvider.java:
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@@ -223,9 +224,11 @@ private void registerMetrics(Collector collector) {
         AtomicLong tmpDirectMemoryUsage = null;
 
         try {
-            Field field = PlatformDependent.class.getDeclaredField("DIRECT_MEMORY_COUNTER");
-            field.setAccessible(true);
-            tmpDirectMemoryUsage = (AtomicLong) field.get(null);
+            Class<?> name = Class.forName("java.nio.Bits");
+            String fieldName = SystemUtils.IS_JAVA_1_8 ? "reservedMemory" : "RESERVED_MEMORY";
+            Field reservedMemory = name.getDeclaredField(fieldName);
+            reservedMemory.setAccessible(true);
+            tmpDirectMemoryUsage = (AtomicLong) reservedMemory.get(null);

Review Comment:
   @dlg99 It's a stataic method, FieldUtils doesn't work



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