Closed
Description
reproduction steps
using Scala 2.13.4
with JDK 11 (Oracle Corporation Java 11.0.3)
Create simple sbt project with target jvm bytecode level set to 11
name := "bug-update-to-non-static-field"
version := "0.1"
scalaVersion := "2.13.4"
scalacOptions := Seq(
"-target:11"
)Create simple file:
object Test {
def main(args: Array[String]): Unit =
foo("hello")
def foo(param: String): Unit = {
trait T {
def bar(): Unit =
println(param)
}
println(new T {})
}
}
problem
run it e.g. via sbt runMain Test
see the error:
[error] (run-main-12) java.lang.IllegalAccessError: Error running public static void Test.main(java.lang.String[]).
[error] java.lang.IllegalAccessError: Update to non-static final field Test$$anon$1.param$1 attempted from a different method (Test$T$1$_setter_$param$1_$eq) than the initializer method <init>
[error] If using a layered classloader, this can occur if jvm package private classes are accessed across layers. This can be fixed by changing to the Flat or ScalaInstance class loader layering strategies.
[error] java.lang.IllegalAccessError: Error running public static void Test.main(java.lang.String[]).
sbt last command doesn't show the stack trace for some reason,
so run e.g. with IntelliJ to see the stack trace:
Exception in thread "main" java.lang.IllegalAccessError: Update to non-static final field Test$$anon$1.param$1 attempted from a different method (Test$T$1$_setter_$param$1_$eq) than the initializer method <init>
at Test$$anon$1.Test$T$1$_setter_$param$1_$eq(Test.scala:11)
at Test$T$1.$init$(Test.scala:5)
at Test$$anon$1.<init>(Test.scala:11)
at Test$.foo(Test.scala:11)
at Test$.main(Test.scala:3)
at Test.main(Test.scala)
Note that with -target:8 (default value) no exception occurs