private Throwable getFailureException(final Throwable listenFailure) {

    JsonRpcServiceException servFail =
        new JsonRpcServiceException(
            String.format(
                "Failed to bind Ethereum JSON-RPC listener to %s:%s: %s",
                config.getHost(), config.getPort(), listenFailure.getMessage()));
    servFail.initCause(listenFailure);

    return servFail;
  }
Construct a EngineJsonRpcService to handle either http or websocket clients

@param vertx The vertx process that will be running this service
@param dataDir The data directory where requests can be buffered
@param config Configuration for the rpc methods being loaded
@param metricsSystem The metrics service that activities should be reported to
@param natService The NAT environment manager.
@param methods The json rpc methods that should be enabled
@param maybeSockets websocket configuration to use
@param scheduler for managing ETH tasks
@param authenticationService used to grant or deny access to methods served
@param livenessService A service responsible for reporting whether this node is live
@param readinessService A service responsible for reporting whether this node has fully started
ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/EngineJsonRpcService.java