Intermittent java error when running Circle CI with nightwatch/selenium/saucelabs

We are intermittently getting this bug when running Circle Ci with nightwatch/selenium/saucelabs

Exception in thread “main” java.lang.UnsupportedClassVersionError: org/openqa/grid/selenium/GridLauncherV3 : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:803)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482)

https://circleci.com/gh/OxfordAbstracts/application/6722

Often the only thing that fixes it is renaming the branch and rebuilding. Any help with resolving this would be greatly appreciated. Thanks

The error is

Exception in thread “main” java.lang.UnsupportedClassVersionError: org/openqa/grid/selenium/GridLauncherV3 : Unsupported major.minor version 52.0

This is the same issue as described here and occurs pretty much every time a new version of webdriver, selenium, or a browser comes out.

You should either manually upgrade the version of these tools so that they match, or pin them so that they are not updated from underneath you.