src/java.base/share/classes/java/nio/Buffer.java

rev 51055 : 8207235: ManagementFactory.getPlatformMXBeans(BufferPoolMXBean.class) throws NPE
Reviewed-by: alanb

@@ -24,10 +24,12 @@
  */
 
 package java.nio;
 
 import jdk.internal.HotSpotIntrinsicCandidate;
+import jdk.internal.misc.JavaNioAccess;
+import jdk.internal.misc.SharedSecrets;
 import jdk.internal.misc.Unsafe;
 
 import java.util.Spliterator;
 
 /**

@@ -705,6 +707,25 @@
     static void checkBounds(int off, int len, int size) { // package-private
         if ((off | len | (off + len) | (size - (off + len))) < 0)
             throw new IndexOutOfBoundsException();
     }
 
+    static {
+        // setup access to this package in SharedSecrets
+        SharedSecrets.setJavaNioAccess(
+            new JavaNioAccess() {
+                @Override
+                public JavaNioAccess.BufferPool getDirectBufferPool() {
+                    return Bits.BUFFER_POOL;
+                }
+                @Override
+                public ByteBuffer newDirectByteBuffer(long addr, int cap, Object ob) {
+                    return new DirectByteBuffer(addr, cap, ob);
+                }
+                @Override
+                public void truncate(Buffer buf) {
+                    buf.truncate();
+                }
+            });
+    }
+
 }