ObjectNode blockNode = jsonFactory.objectNode();
JSONHelper.dumpBlock(blockNode, block, gasUsed,
this.getWorldState().getRootHash(),
keys, this);
EtherObjectMapper mapper = new EtherObjectMapper();
bw.write(mapper.writeValueAsString(blockNode));
} catch (IOException e) {
logger.error(e.getMessage(), e);
} finally {
try {