Where can I set the '--enable-preview'

[JohnWickzzz]

Hi, I use some jdk preview future in my java project, when I start the project, shows error like

错误: 加载主类 xx.Application 时出现 LinkageError
        java.lang.UnsupportedClassVersionError: Preview features are not enabled
 for xx/Application (class file version 65.65535). Try running 
with '--enable-preview'

Where I should set the args?

[s1n7ax]

@buptlibo See methods here helps neoclide/coc-java#131

[JohnWickzzz]

Sorry for reply later, I've been busy with work lately. And I tried a lot of things.
Like update the pom.xml maven plugin:

<configuration>
   <source>21</source>
   <target>21</target>
   <release>21</release>
   <compilerArgs>
      <arg>--enable-preview</arg>
    </compilerArgs>
</configuration>

add the follow code in .settings-ort.eclipse.jdg.core.prefs

org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=enabled
org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=ignore

add '--enable-preview' in .mvn/jvm.config

It's not always in effect for me, sometimes I still have this problem. But I think that 'config message' may help others or maybe will work in other java project. So I've summarized my efforts here.
At last, try 'mvn clean' and 'mvn install', It might have some effect.