http://netty.io/netty-all/: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients. (The Netty Project) 
final class io.netty.util.internal.CleanerJava9 implements io.netty.util.internal.Cleaner
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: io.netty.util.internal.CleanerJava9
  super_class: java.lang.Object
{
  private static final io.netty.util.internal.logging.InternalLogger logger;
    descriptor: Lio/netty/util/internal/logging/InternalLogger;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private static final java.lang.reflect.Method INVOKE_CLEANER;
    descriptor: Ljava/lang/reflect/Method;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=6, locals=5, args_size=0
         0: .line 29
            ldc Lio/netty/util/internal/CleanerJava9;
            invokestatic io.netty.util.internal.logging.InternalLoggerFactory.getInstance:(Ljava/lang/Class;)Lio/netty/util/internal/logging/InternalLogger;
            putstatic io.netty.util.internal.CleanerJava9.logger:Lio/netty/util/internal/logging/InternalLogger;
         1: .line 36
            invokestatic io.netty.util.internal.PlatformDependent0.hasUnsafe:()Z
            ifeq 22
         2: .line 37
            iconst_1
            invokestatic java.nio.ByteBuffer.allocateDirect:(I)Ljava/nio/ByteBuffer;
            astore 2 /* buffer */
        start local 2 // java.nio.ByteBuffer buffer
         3: .line 41
            getstatic io.netty.util.internal.PlatformDependent0.UNSAFE:Lsun/misc/Unsafe;
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            ldc "invokeCleaner"
            iconst_1
            anewarray java.lang.Class
            dup
            iconst_0
            ldc Ljava/nio/ByteBuffer;
            aastore
            invokevirtual java.lang.Class.getDeclaredMethod:(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;
            astore 4 /* m */
        start local 4 // java.lang.reflect.Method m
         4: .line 42
            aload 4 /* m */
            getstatic io.netty.util.internal.PlatformDependent0.UNSAFE:Lsun/misc/Unsafe;
            iconst_1
            anewarray java.lang.Object
            dup
            iconst_0
            aload 2 /* buffer */
            aastore
            invokevirtual java.lang.reflect.Method.invoke:(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
            pop
         5: .line 43
            aload 4 /* m */
            astore 3 /* maybeInvokeMethod */
        end local 4 // java.lang.reflect.Method m
        start local 3 // java.lang.Object maybeInvokeMethod
         6: .line 44
            goto 15
        end local 3 // java.lang.Object maybeInvokeMethod
      StackMap locals: top top java.nio.ByteBuffer
      StackMap stack: java.lang.NoSuchMethodException
         7: astore 4 /* e */
        start local 4 // java.lang.NoSuchMethodException e
         8: .line 45
            aload 4 /* e */
            astore 3 /* maybeInvokeMethod */
        end local 4 // java.lang.NoSuchMethodException e
        start local 3 // java.lang.Object maybeInvokeMethod
         9: goto 15
        end local 3 // java.lang.Object maybeInvokeMethod
        10: .line 46
      StackMap locals:
      StackMap stack: java.lang.reflect.InvocationTargetException
            astore 4 /* e */
        start local 4 // java.lang.reflect.InvocationTargetException e
        11: .line 47
            aload 4 /* e */
            astore 3 /* maybeInvokeMethod */
        end local 4 // java.lang.reflect.InvocationTargetException e
        start local 3 // java.lang.Object maybeInvokeMethod
        12: goto 15
        end local 3 // java.lang.Object maybeInvokeMethod
        13: .line 48
      StackMap locals:
      StackMap stack: java.lang.IllegalAccessException
            astore 4 /* e */
        start local 4 // java.lang.IllegalAccessException e
        14: .line 49
            aload 4 /* e */
            astore 3 /* maybeInvokeMethod */
        end local 4 // java.lang.IllegalAccessException e
        start local 3 // java.lang.Object maybeInvokeMethod
        15: .line 51
      StackMap locals: java.lang.Object
      StackMap stack:
            aload 3 /* maybeInvokeMethod */
            instanceof java.lang.Throwable
            ifeq 19
        16: .line 52
            aconst_null
            astore 0 /* method */
        start local 0 // java.lang.reflect.Method method
        17: .line 53
            aload 3 /* maybeInvokeMethod */
            checkcast java.lang.Throwable
            astore 1 /* error */
        start local 1 // java.lang.Throwable error
        18: .line 54
            goto 24
        end local 1 // java.lang.Throwable error
        end local 0 // java.lang.reflect.Method method
        19: .line 55
      StackMap locals:
      StackMap stack:
            aload 3 /* maybeInvokeMethod */
            checkcast java.lang.reflect.Method
            astore 0 /* method */
        start local 0 // java.lang.reflect.Method method
        20: .line 56
            aconst_null
            astore 1 /* error */
        end local 3 // java.lang.Object maybeInvokeMethod
        end local 2 // java.nio.ByteBuffer buffer
        start local 1 // java.lang.Throwable error
        21: .line 58
            goto 24
        end local 1 // java.lang.Throwable error
        end local 0 // java.lang.reflect.Method method
        22: .line 59
      StackMap locals:
      StackMap stack:
            aconst_null
            astore 0 /* method */
        start local 0 // java.lang.reflect.Method method
        23: .line 60
            new java.lang.UnsupportedOperationException
            dup
            ldc "sun.misc.Unsafe unavailable"
            invokespecial java.lang.UnsupportedOperationException.<init>:(Ljava/lang/String;)V
            astore 1 /* error */
        start local 1 // java.lang.Throwable error
        24: .line 62
      StackMap locals: java.lang.reflect.Method java.lang.Throwable
      StackMap stack:
            aload 1 /* error */
            ifnonnull 27
        25: .line 63
            getstatic io.netty.util.internal.CleanerJava9.logger:Lio/netty/util/internal/logging/InternalLogger;
            ldc "java.nio.ByteBuffer.cleaner(): available"
            invokeinterface io.netty.util.internal.logging.InternalLogger.debug:(Ljava/lang/String;)V
        26: .line 64
            goto 28
        27: .line 65
      StackMap locals:
      StackMap stack:
            getstatic io.netty.util.internal.CleanerJava9.logger:Lio/netty/util/internal/logging/InternalLogger;
            ldc "java.nio.ByteBuffer.cleaner(): unavailable"
            aload 1 /* error */
            invokeinterface io.netty.util.internal.logging.InternalLogger.debug:(Ljava/lang/String;Ljava/lang/Throwable;)V
        28: .line 67
      StackMap locals:
      StackMap stack:
            aload 0 /* method */
            putstatic io.netty.util.internal.CleanerJava9.INVOKE_CLEANER:Ljava/lang/reflect/Method;
        end local 1 // java.lang.Throwable error
        end local 0 // java.lang.reflect.Method method
        29: .line 68
            return
      LocalVariableTable:
        Start  End  Slot               Name  Signature
           17   19     0             method  Ljava/lang/reflect/Method;
           20   22     0             method  Ljava/lang/reflect/Method;
           23   29     0             method  Ljava/lang/reflect/Method;
           18   19     1              error  Ljava/lang/Throwable;
           21   22     1              error  Ljava/lang/Throwable;
           24   29     1              error  Ljava/lang/Throwable;
            3   21     2             buffer  Ljava/nio/ByteBuffer;
            6    7     3  maybeInvokeMethod  Ljava/lang/Object;
            9   10     3  maybeInvokeMethod  Ljava/lang/Object;
           12   13     3  maybeInvokeMethod  Ljava/lang/Object;
           15   21     3  maybeInvokeMethod  Ljava/lang/Object;
            4    6     4                  m  Ljava/lang/reflect/Method;
            8    9     4                  e  Ljava/lang/NoSuchMethodException;
           11   12     4                  e  Ljava/lang/reflect/InvocationTargetException;
           14   15     4                  e  Ljava/lang/IllegalAccessException;
      Exception table:
        from    to  target  type
           3     6       7  Class java.lang.NoSuchMethodException
           3     6      10  Class java.lang.reflect.InvocationTargetException
           3     6      13  Class java.lang.IllegalAccessException

  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.util.internal.CleanerJava9 this
         0: .line 28
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // io.netty.util.internal.CleanerJava9 this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/util/internal/CleanerJava9;

  static boolean isSupported();
    descriptor: ()Z
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 71
            getstatic io.netty.util.internal.CleanerJava9.INVOKE_CLEANER:Ljava/lang/reflect/Method;
            ifnull 1
            iconst_1
            ireturn
      StackMap locals:
      StackMap stack:
         1: iconst_0
            ireturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void freeDirectBuffer(java.nio.ByteBuffer);
    descriptor: (Ljava/nio/ByteBuffer;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=3, args_size=2
        start local 0 // io.netty.util.internal.CleanerJava9 this
        start local 1 // java.nio.ByteBuffer buffer
         0: .line 77
            getstatic io.netty.util.internal.CleanerJava9.INVOKE_CLEANER:Ljava/lang/reflect/Method;
            getstatic io.netty.util.internal.PlatformDependent0.UNSAFE:Lsun/misc/Unsafe;
            iconst_1
            anewarray java.lang.Object
            dup
            iconst_0
            aload 1 /* buffer */
            aastore
            invokevirtual java.lang.reflect.Method.invoke:(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
            pop
         1: .line 78
            goto 4
      StackMap locals:
      StackMap stack: java.lang.Throwable
         2: astore 2 /* cause */
        start local 2 // java.lang.Throwable cause
         3: .line 79
            aload 2 /* cause */
            invokestatic io.netty.util.internal.PlatformDependent0.throwException:(Ljava/lang/Throwable;)V
        end local 2 // java.lang.Throwable cause
         4: .line 81
      StackMap locals:
      StackMap stack:
            return
        end local 1 // java.nio.ByteBuffer buffer
        end local 0 // io.netty.util.internal.CleanerJava9 this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    5     0    this  Lio/netty/util/internal/CleanerJava9;
            0    5     1  buffer  Ljava/nio/ByteBuffer;
            3    4     2   cause  Ljava/lang/Throwable;
      Exception table:
        from    to  target  type
           0     1       2  Class java.lang.Throwable
    MethodParameters:
        Name  Flags
      buffer  
}
SourceFile: "CleanerJava9.java"