[MCOMPILER-546] Maven compiling fails when using JEP 443 - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Information Provided
Affects Version/s: 3.11.0
Fix Version/s: None
Labels:
None
Environment:
Both MacOS and Windows.
Maven 3.9.4
Maven Compiler 3.11
Java 21 Preview

Description

I'm trying to test out the preview feature described in JEP 443: Unnamed patterns and variables https://openjdk.org/jeps/443 . I have the following:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
        <source>21</source>
        <target>21</target>
        <compilerArgs>
            <arg>--enable-preview</arg>
        </compilerArgs>
    </configuration>
</plugin>

I then run `mvn -X compile`, the result of which has been attached as mvn-compile.log.

The target just contains the Main.class file and the `createdFiles.lst` with: `org/example/Main.class` and `inputFiles.lst` with: `/Users/vlad.galuska/IdeaProjects/preview/Java21Preview/src/main/java/org/example/Main.java`

Note: The picture is from IntelIJ but all the commands have been run from the command line.

When running the generated .class file:
`cd target/classes `

`java --enable-preview org.example.Main`

I get the following message:
```
Error: LinkageError occurred while loading main class org.example.Main
java.lang.ClassFormatError: Illegal field name "" in class org/example/Main
```

This only happens when using the maven compiler plugin as when compiling manually from the command line:

`javac --enable-preview --release 21 org/example/Main.java `

`java --enable-preview org.example.Main `

I get the intended result:

```

Hello, World!
Hello, World!
Hello, World!

```

The same behavior has been recorded on Windows. I've also tried this with the amazon coretto version of java 21, OpenJDK Java 21 GA release and OpenJDK java 21.ea.35-open.

Maven is also a clean install of 3.9.4, but was reproduced with a 3.8 I had installed previously.

Here's also a repository where I have uploaded the code base for this bug report:
https://github.com/VladGaluska/jdk21-preview-bug