class RpcCommandFactory implements CommandFactory {
    @Override
    public RpcRequestCommand createRequestCommand(Object requestObject) {
        return new RpcRequestCommand(requestObject);
    }

    @Override
    public RpcResponseCommand createResponse(final Object responseObject,
                                             final RemotingCommand requestCmd) {
        RpcResponseCommand response = new RpcResponseCommand(requestCmd.getId(), responseObject);
        if (null != responseObject) {
            response.setResponseClass(responseObject.getClass().getName());
        } else {
            response.setResponseClass(null);
        }
        response.setSerializer(requestCmd.getSerializer());
        response.setProtocolSwitch(requestCmd.getProtocolSwitch());
        response.setResponseStatus(ResponseStatus.SUCCESS);
        return response;
    }

    @Override
    public RpcResponseCommand createExceptionResponse(int id, String errMsg) {
        return createExceptionResponse(id, null, errMsg);
    }

    @Override
    public RpcResponseCommand createExceptionResponse(int id, final Throwable t, String errMsg) {
        RpcResponseCommand response = null;
        if (null == t) {
            response = new RpcResponseCommand(id, createServerException(errMsg));
        } else {
            response = new RpcResponseCommand(id, createServerException(t, errMsg));
        }
        response.setResponseClass(RpcServerException.class.getName());
        response.setResponseStatus(ResponseStatus.SERVER_EXCEPTION);
        return response;
    }

    @Override
    public RpcResponseCommand createExceptionResponse(int id, ResponseStatus status) {
        RpcResponseCommand responseCommand = new RpcResponseCommand();
        responseCommand.setId(id);
        responseCommand.setResponseStatus(status);
        return responseCommand;
    }

    @Override
    public RpcResponseCommand createExceptionResponse(int id, ResponseStatus status, Throwable t) {<FILL_FUNCTION_BODY>}

    @Override
    public ResponseCommand createTimeoutResponse(InetSocketAddress address) {
        ResponseCommand responseCommand = new ResponseCommand();
        responseCommand.setResponseStatus(ResponseStatus.TIMEOUT);
        responseCommand.setResponseTimeMillis(System.currentTimeMillis());
        responseCommand.setResponseHost(address);
        return responseCommand;
    }

    @Override
    public RemotingCommand createSendFailedResponse(final InetSocketAddress address,
                                                    Throwable throwable) {
        ResponseCommand responseCommand = new ResponseCommand();
        responseCommand.setResponseStatus(ResponseStatus.CLIENT_SEND_ERROR);
        responseCommand.setResponseTimeMillis(System.currentTimeMillis());
        responseCommand.setResponseHost(address);
        responseCommand.setCause(throwable);
        return responseCommand;
    }

    @Override
    public RemotingCommand createConnectionClosedResponse(InetSocketAddress address, String message) {
        ResponseCommand responseCommand = new ResponseCommand();
        responseCommand.setResponseStatus(ResponseStatus.CONNECTION_CLOSED);
        responseCommand.setResponseTimeMillis(System.currentTimeMillis());
        responseCommand.setResponseHost(address);
        return responseCommand;
    }

    /**
     * create server exception using error msg, no stack trace
     * @param errMsg the assigned error message
     * @return an instance of RpcServerException
     */
    private RpcServerException createServerException(String errMsg) {
        return new RpcServerException(errMsg);
    }

    /**
     * create server exception using error msg and fill the stack trace using the stack trace of throwable.
     *
     * @param t the origin throwable to fill the stack trace of rpc server exception
     * @param errMsg additional error msg, <code>null</code> is allowed
     * @return an instance of RpcServerException
     */
    private RpcServerException createServerException(Throwable t, String errMsg) {
        String formattedErrMsg = String.format(
            "[Server]OriginErrorMsg: %s: %s. AdditionalErrorMsg: %s", t.getClass().getName(),
            t.getMessage(), errMsg);
        RpcServerException e = new RpcServerException(formattedErrMsg);
        e.setStackTrace(t.getStackTrace());
        return e;
    }
}

        RpcResponseCommand responseCommand = this.createExceptionResponse(id, status);
        responseCommand.setResponseObject(createServerException(t, null));
        responseCommand.setResponseClass(RpcServerException.class.getName());
        return responseCommand;
    
<no_super_class>