Driver class not found: com.opera.core.systems.OperaDriver - selenium-grid

Question

Getting below exception when trying to assign the node to Selenium Grid. And this node is not showing in Grid console. Any idea why am I getting this exception?
java -jar selenium-server-standalone-2.48.2.jar -port 5555 -role node -hub http://localhost:4444/grid/register
:10:41.671 INFO - Launching a Selenium Grid node
:10:43.169 INFO - OS: Windows 7 6.1 amd64
:10:43.174 INFO - v2.48.0, with Core v2.48.0. Built from revision 41bccdd
:10:43.232 INFO - Driver class not found: com.opera.core.systems.OperaDriver
:10:43.232 INFO - Driver provider com.opera.core.systems.OperaDriver is not r
stered
:10:43.262 INFO - Selenium Grid node is up and ready to register to the hub
:10:43.285 INFO - Starting auto registration thread. Will try to register eve
5000 ms.
:10:43.285 INFO - Registering the node to the hub: http://localhost:4444/grid
gister
:10:43.296 INFO - The node is registered to the hub and ready to use
:10:53.760 INFO - The node is registered to the hub and ready to use

Answer 1

For one thing, I would choose Safari over Opera. Secondly, make sure that Selenium Safari and Opera drivers show up amongst your dependencies. You can explicitly define it like so :
<dependency>
<groupId>org.seleniumhq.selenium</groupId>
<artifactId>selenium-safari-driver</artifactId>
<version>2.48.2</version>
</dependency>
But, what you basically need to do is configure the Grid node like so, with adjustments for the Mac. This is my hacked-up guess at the configuration. You'll need to adjust it.:
{
"capabilities" : [{
"browserName" : "firefox",
"acceptSslCerts" : true,
"javascriptEnabled" : true,
"takesScreenshot" : false,
"firefox_profile" : "",
"browser-version" : "42",
"platform" : "MAC",
"maxInstances" : 5,
"firefox_binary" : "",
"cleanSession" : true
}, {
"browserName" : "chrome",
"maxInstances" : 5,
"platform" : "MAC",
"webdriver.chrome.driver" : "/Applications/Opera.app/Contents/MacOS/Chrome/chrome"
}, {
"browserName" : "safari",
"maxInstances" : 1,
"platform" : "MAC",
"version" : "12",
"webdriver.safari.driver" : "
https://code.google.com/p/selenium/wiki/OperaDriver
http://selenium-release.storage.googleapis.com/2.48/SafariDriver.safariextz"
}, {
"browserName" : "opera",
"maxInstances" : 1,
"platform" : "MAC",
"version" : "8",
"webdriver.opera.driver" : "???"
}
],
"configuration" : {
"_comment" : "Configuration for Node",
"cleanUpCycle" : 2000,
"timeout" : 30000,
"proxy" : "org.openqa.grid.selenium.proxy.WebDriverRemoteProxy",
"port" : 5555,
"host" : ip,
"register" : true,
"hubPort" : 4444,
"maxSessions" : 5
}
}