Selenium Grid: RemoteWebDriver blocks the execution - selenium

Question

I am new on using Selenium and I faced some questions on using RemoteWebDriver in Selenium Grid 2. I would like to what's wrong in my code. Thanks.
I set the RemoteWebDriver in 3 steps:
Set the Chrome driver to system property, I checked the path is correct.
Set the capabilities
Turn on the driver by RemoteWebDriver
logger.info("1. Start");
File file = new File("/path/of/chromedriver");
System.setProperty("webdriver.chrome.driver", file.getAbsolutePath());
logger.info("2. Get Path: " + file.getAbsolutePath());
DesiredCapabilities caps = new DesiredCapabilities();
caps.setBrowserName(DesiredCapabilities.chrome().getBrowserName());
logger.info("3. Set capabilities: " + caps);
URL url = new URL(URL);
RemoteWebDriver driver = new RemoteWebDriver(url, caps);
logger.info("4. Initialize driver: " + driver);
logger.info("5. End");
return driver;
The result pass first 2 steps but fail in the last step because the log does not show. It seems there is a problem in setting RemoteWebDriver. The log is shown as below:
May 16, 2017 8:28:16 PM com.test.Setup setupDriver
INFO: 1. Start
May 16, 2017 8:28:16 PM com.test.Setup setupDriver
INFO: 2. Get Path: /path/of/chromedriver
May 16, 2017 8:28:16 PM com.test.Setup setupDriver
INFO: 3. Set capabilities: Capabilities [{browserName=chrome}]
May 16, 2017 8:28:16 PM com.test.Setup setupDriver
SEVERE: java.lang.IllegalStateException: The path to the driver executable must be set by the webdriver.chrome.driver system property; for more information, see https://github.com/SeleniumHQ/selenium/wiki/ChromeDriver. The latest version can be downloaded from http://chromedriver.storage.googleapis.com/index.html
Can anyone suggest where is the problem, thanks!
selenium-server-standalone-3.4.0.jar
selenium-java-3.4.0
chromedriver 2.29
java version "1.8.0_111"
TestNG

Answer 1

The exception says it all.
May 16, 2017 8:28:16 PM com.test.Setup setupDriver SEVERE: java.lang.IllegalStateException: The path to the driver executable must be set by the webdriver.chrome.driver system property; for more information, see https://github.com/SeleniumHQ/selenium/wiki/ChromeDriver. The latest version can be downloaded from http://chromedriver.storage.googleapis.com/index.html
Please ensure you do the following on the machine in which you are running the node.
Have the location of the chromedriver binary made available as part of your PATH environment variable.
Now to ensure that the location is properly set, open up a new command prompt/terminal and type chromedriver.
You should see an output as below (my output is from a MAC)
12:16 $ chromedriver
Starting ChromeDriver 2.29.461585 (0be2cd95f834e9ee7c46bcc7cf405b483f5ae83b) on port 9515
Only local connections are allowed.
Once you see a similar output, you can try running your test again and you should be fine.