Executors.createDefaultExecutor throws ClassCastException

[pnerg]

Setting the system property javascalautils.concurrent.executorprovider referring to a class implementing the ExecutorProvider will result in a ClassCastException being thrown by the Executors.createDefaultExecutor method.

The result of the ReflectionUtil.newInstance contains a ExecutorProvider and not a Executor as the resulting Try expects. There's a missing map operation that will invoke the create method