Starting the selenium server standalone with chrome driver command,
for latest selenium (3.0+)
java -Dwebdriver.chrome.driver=chromedriver.exe -jar selenium-server-standalone-3.0.0-beta2.jar
for older versions (lower than 3)
java -jar selenium-server-standalone-2.53.1.jar -Dwebdriver.chrome.driver=chromedriver.exe
So for the latest selenium, you need to specify the driver first and after that, the selenium jar.
Note: use the appropriate chromedriver version for your os