Github user heathermiller commented on the pull request:
https://github.com/apache/spark/pull/1929#issuecomment-53507521
Ok, so I think I have a solution. It took an embarrassing amount of
experimentation and grokking of the REPL (not my area of expertise), but if you
just create a dummy `Run` instance, it seems to force symbols to be initialized
when you need them to be (i.e., classloading)
So, in your implementation of `addUrlsToClassPath`, what seems to work is:
```scala
def addUrlsToClassPath(urls: URL*): Unit = {
new Run // force some initialization
urls.foreach(_runtimeClassLoader.addNewUrl) // Add jars/classes to
runtime for execution
updateCompilerClassPath(urls: _*) // Add jars/classes to
compile time for compiling
}
```
After running into 10,000 walls trying to force the initialization of
symbols in previous/current runs, I discovered this happening in Global:
https://github.com/scala/scala/blob/2.11.x/src/compiler/scala/tools/nsc/Global.scala#L754
Which in turn forces initialization in `Run`places like:
https://github.com/scala/scala/blob/2.11.x/src/compiler/scala/tools/nsc/Global.scala#L1051
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