From 7d07bbabbf89731fb8988553d0612e555391af92 Mon Sep 17 00:00:00 2001
From: Ethan Atkins <contact@ethanatkins.com>
Date: Thu, 30 Apr 2020 20:04:58 -0700
Subject: [PATCH] Fix DefinesClass implementation for jdk > 8

When trying to use any jdk > 8 with the latest sbt, sbt will die in some
projects because it tries to call Locate.defineClass on rt.jar, which
is represented with a DummyVirtualFile and causes a crash.
---
 main/src/main/scala/sbt/Defaults.scala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/main/src/main/scala/sbt/Defaults.scala b/main/src/main/scala/sbt/Defaults.scala
index 36aaeef43..9c13e176b 100755
--- a/main/src/main/scala/sbt/Defaults.scala
+++ b/main/src/main/scala/sbt/Defaults.scala
@@ -179,7 +179,8 @@ object Defaults extends BuildCommon {
       classpathEntryDefinesClass := {
         val converter = fileConverter.value
         val f = FileValueCache({ x: NioPath =>
-          Locate.definesClass(converter.toVirtualFile(x))
+          if (x.getFileName.toString != "rt.jar") Locate.definesClass(converter.toVirtualFile(x))
+          else ((_: String) => false): DefinesClass
         }).get;
         { (x: File) =>
           f(x.toPath)