Intermittent NoClassDefFoundError error running Selenium JUnit tests

Posted by Matt Sheppard on Stack Overflow See other posts from Stack Overflow or by Matt Sheppard
Published on 2011-01-17T00:49:18Z Indexed on 2011/01/17 0:53 UTC
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Filed under:

java

|

junit

|

selenium

For some time, I've been running a substantial set of JUnit / Selenium tests against a number of platforms on a nightly basis. Intermittently (about once in every 40 runs), all the tests for a given platform fail with a NoClassDefFoundError on the common superclass of all my tests as follows.

java.lang.NoClassDefFoundError: [common super class of all my selenium tests]
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
at java.lang.Class.getConstructors(Class.java:1459)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

Re-invoking the tests will generally get the tests running normally, so it's clearly something dependent on some condition I am not considering.

What might be causing this error to occur seemingly randomly?

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