Work around CaseClassSigParser exceptions in sbt:console

gistfile1.md

When doing something in an SBT console which requires the loading of Case Class instances via fig or jerkson if the code is executed within inClassLoader it will produce a result rather than a ClassNotFoundException.

For example in Persnicketly:

val articles = inClassLoader(classOf[com.persnicketly.persistence.Connection$]) {
  ScoredArticleDao.select(from = 60, count = 100)
}

Will successfully load MongoDB configuration from config.json, access the db and retrieve articles.

inClassLoader.scala

def inClassLoader[T](cls: Class[_])(f: => T): T = {
  val prev = Thread.currentThread.getContextClassLoader
  try {
    Thread.currentThread.setContextClassLoader(
       cls.getClassLoader
    )
    f
  } finally {
    Thread.currentThread.setContextClassLoader(prev)
  }
}

inClassLoaderExample.scala

val articles = inClassLoader(classOf[com.persnicketly.persistence.Connection$]) {
  ScoredArticleDao.select(from = 60, count = 100)
}