@Override
        public boolean equals(final Object o) {
            if (this == o) {
                return true;
            }
            if (o == null || getClass() != o.getClass()) {
                return false;
            }

            final HeapHistogramEntry that = (HeapHistogramEntry) o;

            if (instances != that.instances) {
                return false;
            }
            if (bytes != that.bytes) {
                return false;
            }
            return className.equals(that.className);
        }
Generates a heap histogram using the 'gcClassHistogram' MBean action.  Will
block until the action completes/fails.
list of {@link HeapHistogramEntry}
stroom-node/stroom-node-impl/src/main/java/stroom/node/impl/HeapHistogramService.java