Switch expressions not supported

[kbotond]

Hi,

I see the GWT dependency was upgraded to 2.12 in November 2024, but no new release has been published to Maven Central ever since.

We would like to use Java 17 language features like switch expressions and records in our GWT-based projects. I tried to manually override the GWT dependencies of gwt-maven-plugin, but still get the same errors:
[ERROR] Line 32: Arrow in case statement supported from Java 14 onwards only
[ERROR] Line 29: Switch Expressions are supported from Java 14 onwards only

Do we have to wait for a new release of the plugin, or is it possible to use the old version (1.1.0) to build for GWT 2.12 with additional configuration changes?

Regards.

[FrankHossfeld]

I am using the latest version of the gwt-maven-plugin with Java 17 without any problems. All I had to do was setting the sourceLevel to 17.

[tbroyer]

The plugin itself does not have a dependency on GWT (the dependencies in the POM have scope=test): https://tbroyer.github.io/gwt-maven-plugin/usage.html#GWT_Version_Compatibility

Did you correctly set the <sourceLevel>?
https://tbroyer.github.io/gwt-maven-plugin/compile-mojo.html#sourceLevel

[kbotond]

Setting sourceLevel to 17 solved the issue, thanks!