Weird error in REPL: bad constant pool index: 0

[pawelprazak]

Version(s)
1.0.4

Describe the bug
Confusing and unexpected error in simplest REPL command.

To Reproduce

scala-cli
Welcome to Scala 3.3.0 (21, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.

scala> val s = ""
error while loading AccessFlag,
class file /modules/java.base/java/lang/reflect/AccessFlag.class is broken, reading aborted with class java.lang.RuntimeException
bad constant pool index: 0 at pos: 5189
error while loading ElementType,
class file /modules/java.base/java/lang/annotation/ElementType.class is broken, reading aborted with class java.lang.RuntimeException
bad constant pool index: 0 at pos: 1220
2 errors found

Expected behaviour
To not see two errors, or at least get actionable error messages.

[pawelprazak]

I've updated scala-cli to 1.0.5 and it is fixed now:

scala-cli
Welcome to Scala 3.3.1 (21.0.1, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.

scala> val s = ""
val s: String = ""

scala>

[SethTisue]

looks like a JDK 21 thing

note that 1.0.5 defaults to 3.3.1 — I think on 1.0.4, scala-cli -S 3.3.1 would probably have worked for you

JDK 21 support landed in 3.3.1 with this PR scala/scala3#17536

scala/scala3#18618 will improve the error message you get, starting with 3.3.2, thanks to @bishabosha

[SethTisue]

it's a bit unusual that there was a fairly long delay between Scala 3.3.1 coming out and Scala-CLI 1.0.5 coming out with 3.3.1 as the default. there is some discussion at #2394 about the prospect of avoiding such delays in the future

[pawelprazak]

Thank you for the context! Keep up the good work :)