$ jcmd 21844 GC.class_stats
21844:
WARNING: Ran out of C-heap; undercounted 368 total instances in data below
Index Super InstBytes KlassBytes annotations   CpAll MethodCount Bytecodes MethodAll   ROAll   RWAll   Total ClassName
    1    -1   3176392        512           0       0           0         0         0      24     624     648 [I
    2    -1    339752        512           0       0           0         0         0      24     624     648 [B
    3    35    169128        680         136   17024         123      5375     33856   23816   29856   53672 java.lang.String
    4    35    157488        784           0   23424         148      5833     38424   29096   36176   65272 java.lang.Class
....