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https://issues.apache.org/jira/browse/MCOMPILER-546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17767516#comment-17767516
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Vlad Galuska commented on MCOMPILER-546:
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[~michael-o] Replaced with text
> Maven compiling fails when using JEP 443
> ----------------------------------------
>
> Key: MCOMPILER-546
> URL: https://issues.apache.org/jira/browse/MCOMPILER-546
> Project: Maven Compiler Plugin
> Issue Type: Bug
> Affects Versions: 3.11.0
> Environment: Both MacOS and Windows.
> Maven 3.9.4
> Maven Compiler 3.11
> Java 21 Preview
> Reporter: Vlad Galuska
> Priority: Major
> Attachments: mvn-compile-1.log, pom.xml
>
>
> 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:
> {code:java}
> <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> {code}
> 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]
>
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