Vlad Galuska created MCOMPILER-546:
--------------------------------------
Summary: 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
Attachments: image-2023-09-21-14-15-13-708.png,
image-2023-09-21-14-20-35-050.png, 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 has the following structure (all good here):
!image-2023-09-21-14-15-13-708.png|width=376,height=330!
{*}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:
!image-2023-09-21-14-20-35-050.png|width=677,height=54!
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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