command_prompt1

D:\temp>set JAVA_OPTS=-XX:-UseCompressedOops

D:\temp>java -version
java version "1.7.0_09"
Java(TM) SE Runtime Environment (build 1.7.0_09-b05)
Java HotSpot(TM) 64-Bit Server VM (build 23.5-b02, mixed mode)

D:\temp>groovysh
Groovy Shell (1.8.4, JVM: 1.7.0_09)
Type 'help' or '\h' for help.
------------------------------------------------------------------------
groovy:000> new MysteryBox()
===> MysteryBox@49c5f29d
groovy:000> quit

D:\temp>

command_prompt2

D:\temp>jps
5896 Jps
9004 GroovyStarter

D:\temp>java -cp .;%JAVA_HOME%\lib\sa-jdi.jar -XX:-UseCompressedOops sun.jvm.hotspot.CLHSDB
hsdb> attach 9004
Attaching to process 9004, please wait...
hsdb> universe
Heap Parameters:
ParallelScavengeHeap [ PSYoungGen [ eden =  [0x000000000ff70000,0x0000000010e730b0,0x0000000011ed0000] , from =  [0x0000000012160000,0x00000000123ee078,0x00000000123f0000] , to =  [0x0000000011ed0000,0x0000000011ed0000,0x0000000012160000]  ] PSOldGen [  [0x000000000aa10000,0x000000000b8827f8,0x000000000d3c0000]  ] PSPermGen [ [0x0000000005810000,0x00000000065f5290,0x0000000006cd0000]  ]  ] hsdb>
hsdb> scanoops 0x000000000ff70000 0x0000000010e730b0 MysteryBox
0x0000000010d32db8 MysteryBox
hsdb> inspect 0x0000000010d32db8
instance of Oop for MysteryBox @ 0x0000000010d32db8 @ 0x0000000010d32db8 (size = 4
8)
_mark: 316853624065
_metadata._klass: InstanceKlass for MysteryBox @ 0x0000000006553488 Oop @ 0x000000
0006553488
x0: 0
x1: 0
y0: false
y1: false
y2: false
y3: false
z0: 0
a: [D @ 0x0000000010d32de8 Oop for [D @ 0x0000000010d32de8
hsdb> inspect 0x0000000010d32de8
instance of [D @ 0x0000000010d32de8 @ 0x0000000010d32de8 (size = 88)
_mark: 1
_metadata._klass: TypeArrayKlass for [D @ 0x0000000005810ad0 Oop @ 0x0000000005810
ad0
0: 0.0
1: 0.0
2: 0.0
3: 0.0
4: 0.0
5: 0.0
6: 0.0
7: 0.0
hsdb> class MysteryBox
MysteryBox @0x0000000006553488
hsdb> print 0x0000000006553488

public class MysteryBox @0x0000000006553488



Super Class
public class java.lang.Object @0x0000000005812e38
Fields

private  long x0; (offset = 16)
private  long x1; (offset = 24)
private  boolean y0; (offset = 36)
private  boolean y1; (offset = 37)
private  boolean y2; (offset = 38)
private  boolean y3; (offset = 39)
private  int z0; (offset = 32)
private  double[] a; (offset = 40)


Methods
public void <init>() @0x0000000006553400;

Constant Pool
Constant Pool of [public class MysteryBox @0x0000000006553488] @0x00000000065531b0

hsdb> quit

D:\temp>

MysteryBox.java

public class MysteryBox {
  private long x0, x1;
  private boolean y0, y1, y2, y3;
  private int z0;
  private double[] a = new double[8];
}