Update presentation-compiler/test/dotty/tools/pc/utils/JRE.scala

Co-authored-by: Tomasz Godzik <[email protected]>

Author: rochala

presentation-compiler/test/dotty/tools/pc/utils/JRE.scala

@@ -3,20 +3,11 @@ package dotty.tools.pc.utils
 object JRE:
 
   def getJavaMajorVersion: Int =
-    val javaVersion = sys.env.get("java.version").filter(!_.isEmpty())
+    val javaVersion = sys.env.get("java.specification.version").filter(!_.isEmpty())
 
     javaVersion match
       case Some(version) if version.startsWith("1.8") => 8
-      case _ =>
-        scala.util.Try:
-          val versionMethod = classOf[Runtime].getMethod("version")
-          versionMethod.nn.setAccessible(true)
-          val version = versionMethod.nn.invoke(null)
-
-          val majorMethod = version.getClass().getMethod("feature")
-          majorMethod.nn.setAccessible(true)
-          val major = majorMethod.nn.invoke(version).asInstanceOf[Int]
-          major
-        .getOrElse(8) // Minimal version supported by Scala
+      case Some(version) => version
+      case None => 8