Error trying to build project using HEAD-SNAPSHOT version

[Ri-gers]

I tried to use the development branch (HEAD-SNAPSHOT) to test the latest changes, however I am not able to build my project using that branch. 2.0.3 worked fine, I receive the below error which is connected to LimitOneOfPrefixedCssClass.java class:

[INFO] [ERROR] Errors in 'jar:file:/C:/Users/ri.gers/.m2/repository/org/dominokit/domino-ui-shared/HEAD-SNAPSHOT/domino-ui-shared-HEAD-SNAPSHOT.jar!/org/dominokit/domino/ui/style/LimitOneOfPrefixedCssClass.java'
[INFO] [ERROR] Line 83: '<>' cannot be used with anonymous classes
[INFO] [ERROR] Line 65: '<>' cannot be used with anonymous classes
[INFO] [ERROR] Aborting compile due to errors in some input files
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 01:32 min
[INFO] Finished at: 2025-05-19T14:48:26+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal net.ltgt.gwt.maven:gwt-maven-plugin:1.1.0:compile (default) on project gwt-highcharts: GWT exited with status 1 -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

[vegegoku]

Can you please add more info about the build environment, java version and the command used to build with, notice that the development branch build here https://github.com/DominoKit/domino-ui/actions was broken at some point but was fixed later.

[Ri-gers]

Sure, I'm using Java version 21.0.3, Maven 3.9.6, GWT 2.12.2, compileSource/Target 21, gwt-maven-plugin 1.1.0 and Windows 11 as OS.
I used mvn clean verify or mvn clean install, so noting special, both fail with the above shown error message. This has not been the case with the release builds like 2.0.3/2.0.4, they built just fine.
I also checked the branch build you linked, however I do not see any relation here

[FrankHossfeld]

AFAIK, anonymous classes are introduced in Java 9. Looks like you are trying to build the project with sourceLevel 8 or lower.

[sstamm]

Environment is:

Apache Maven 3.9.9 (8e8579a9e76f7d015ee5ec7bfcdc97d260186937)
Maven home: C:\Tools\maven
Java version: 21.0.6, vendor: Eclipse Adoptium, runtime: C:\Program Files\Java\JDK21
Default locale: en_US, platform encoding: UTF-8
OS name: "windows 11", version: "10.0", arch: "amd64", family: "windows"

Also maven says:
[INFO] Compiling 189 source files with javac [forked debug release 21] to target.....

[FrankHossfeld]

This is how I use the gwt-maven-plugin:

        <plugin>
          <groupId>net.ltgt.gwt.maven</groupId>
          <artifactId>gwt-maven-plugin</artifactId>
          <version>${plugin.version.gwt}</version>
          <extensions>true</extensions>
          <configuration>
            <sourceLevel>17</sourceLevel>
            <failOnError>true</failOnError>
            <jvmArgs>
              <jvmArg>-Xms1042m</jvmArg>
              <jvmArg>-Xmx8192m</jvmArg>
            </jvmArgs>
          </configuration>
        </plugin>

Setting the sourceLevel to 17. Think, higher values will not work.

[Ri-gers]

Thank you Frank, that was the problem!