jshell --enable-preview --execution=local bug?

[Michel Trudeau]

Max,

FYI – https://bugs.openjdk.org/browse/JDK-8308305

-Michel

From: kulla-dev <kulla-dev-retn at openjdk.org> on behalf of Max Rydahl Andersen <manderse at redhat.com>
Date: Tuesday, May 16, 2023 at 3:53 PM
To: kulla-dev at openjdk.org <kulla-dev at openjdk.org>
Subject: jshell --enable-preview --execution=local bug?

Hi,

As part of adding --enable-preview support to JBang 0.107<https://github.com/jbangdev/jbang/releases/tag/v0.107.0> I spotted this discrepancy in jshell behaviour. Is this to be expected or a bug?

First what is expected right behaviour:

$ jshell --enable-preview

|  Welcome to JShell -- Version 21-ea

|  For an introduction type: /help intro



jshell> var name="test"; STR."\{name} test";

name ==> "test"

$2 ==> "test test"



jshell> $2.length();

$3 ==> 9

but now when running with --execution=local:

jshell --enable-preview --execution=local

|  Welcome to JShell -- Version 21-ea

|  For an introduction type: /help intro



jshell> var name="test"; STR."\{name} test";

name ==> "test"

$2 ==>



jshell> $2.length();

|  Exception java.lang.UnsupportedClassVersionError: Preview features are not enabled for REPL/$JShell$12 (class file version 65.65535). Try running with '--enable-preview'

|        at ClassLoader.defineClass1 (Native Method)

|        at ClassLoader.defineClass (ClassLoader.java:1018)

|        at SecureClassLoader.defineClass (SecureClassLoader.java:150)

|        at DefaultLoaderDelegate$RemoteClassLoader.findClass (DefaultLoaderDelegate.java:156)

|        at ClassLoader.loadClass (ClassLoader.java:593)

|        at ClassLoader.loadClass (ClassLoader.java:526)

|        at (#3:1)

I found that by duplicating --enable-preview in runtime options fixes things:

$ jshell --enable-preview --execution=local -J--enable-preview

|  Welcome to JShell -- Version 21-ea

|  For an introduction type: /help intro



jshell> var name="test"; STR."\{name} test";

name ==> "test"

$2 ==> "test test"



jshell> $2.length();

$3 ==> 9

Seems like a bug to me, wdyt? and where to open/report this best or is it enough here?

/max
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