Mandrel for JDK 21: native-image --enable-preview fails

[leahneukirchen]

Description

The JDK 21 included in Graal 23 has support for --enable-preview, but native-image lacks the "preview modules" to use them.

How To Reproduce

Steps to reproduce the behavior:

% pwd
/tmp/mandrel-java21-23.1.1.0-Final

% cat Foo.java
void main() {
  System.out.println("yay");
}

% ./bin/javac --enable-preview --release 21 Foo.java
Note: Foo.java uses preview features of Java SE 21.
Note: Recompile with -Xlint:preview for details.

% ./bin/java --enable-preview Foo           
yay

% ./bin/native-image --enable-preview Foo           
Error: The directory containing the preview modules was not found.

Configuration:

• OS: Void Linux
• Architecture: x86_64
• Mandrel version: 23.1.1.0; official Mandrel binaries
• JDK version: openjdk 21.0.1 2023-10-17 LTS; official Mandrel binaries

Expected behavior

I expect the program to be compiled into a native image and then behave as if the JVM ran it.

Additional context

A svm-preview directory seems to be lacking, but I'm not sure where it could come from.

With graalvm-community-openjdk-21.0.1+12.1 this works.

[jerboaa]

Thanks for the report. We'll look into it.

[jerboaa]

Confirmed. The mandrel build seems to be missing the svm-foreign.jar:

GraalVM Community for JDK 21

$ ls graalvm-community-openjdk-21+35.1/lib/svm-preview/builder/
svm-foreign.jar

Mandrel for JDK 21:

$ ls mandrel-java21-23.1.0.0-Final/lib/svm-preview/builder
ls: cannot access 'mandrel-java21-23.1.0.0-Final/lib/svm-preview/builder': No such file or directory

Removing the svm-preview folder from the GraalVM community distro results in the same error as reported.

We'll fix it for the January release (23.1.2.0-Final).

[jerboaa]

Fix has been merged. I'll close this now. Please re-open if the release later this month won't have this fixed.