docs: public static long sizeof(final Object obj) {
          if (null == obj || isSharedFlyweight(obj)) {
              return 0;
          }
  
          final IdentityHashMap visited = new IdentityHashMap(80000);
  
          try {
              return computeSizeof(obj, visited, CLASS_METADATA_CACHE);
          } catch (RuntimeException re) {
              // re.printStackTrace();//DEBUG
              return -1;
          } catch (NoClassDefFoundError ncdfe) {
              // BUG: throws "java.lang.NoClassDefFoundError: org.eclipse.core.resources.IWorkspaceRoot" when run in WSAD
              // 5
              // see
              // http://www.javaworld.com/javaforums/showflat.php?Cat=&Board=958763&Number=15235&page=0&view=collapsed&sb=5&o=
              // System.err.println(ncdfe);//DEBUG
              return -1;
          }
      }