try to fix classloading issues on runLocal and test with java 9 (#255)

* fix class loading for inprocess in java 9

* always add rt jar in case of java 9

* move all custom classloading logic into mill.util.ClassLoader

* add comments explaining parent class loader changes and comment in tests pointing to original issue

1 files changed, 8 insertions, 1 deletions

diff --git a/scalalib/test/resources/hello-world/core/src/Main.scala b/scalalib/test/resources/hello-world/core/src/Main.scala
index 32706d44..d86f4da8 100644
--- a/scalalib/test/resources/hello-world/core/src/Main.scala
+++ b/scalalib/test/resources/hello-world/core/src/Main.scala
@@ -1,5 +1,8 @@
 import scala.collection._
 import java.nio.file.{Files, Paths}
+import java.sql.Date
+import java.time.LocalDate
+import javax.swing.JButton
 
 import Main.{args, greeting}
 object Main0{
@@ -10,7 +13,11 @@ object Main0{
   }
 }
 object Main extends App {
-
+  // testing correct loading of java standard modules in java 9
+  // https://github.com/lihaoyi/mill/issues/251
+  new JButton("hello from javax")
+  val now = Date.valueOf(LocalDate.now())
+  println(s"Today is the date: ${now}")
   val person = Person.fromString("rockjam:25")
   val greeting = s"hello ${person.name}, your age is: ${person.age}"
   println(greeting)