in flink-connector-netty/src/main/scala/org/apache/flink/streaming/connectors/netty/example/NettyUtil.scala [151:158]
private def isBindCollision(exception: Throwable): Boolean = {
exception match {
case e: BindException if e.getMessage != null => true
case e: BindException => isBindCollision(e.getCause)
case e: Exception => isBindCollision(e.getCause)
case _ => false
}
}