Kotlin support in jdtls #4409

Describe the bug
Trying to set up jdtls in nvim

Java works fine, but if i try to use kotlin files in java, it fails with "[ClassName] cannot be resolved to a type"
Code compiles and runs successfully, nothing wrong with it.
Considering this, jdtls should pick up kotlin files, but it does not in my case.

Currently I run jdtls with the following command:

java
-Declipse.application=org.eclipse.jdt.ls.core.id1
-Dosgi.bundles.defaultStartLevel=4
-Declipse.product=org.eclipse.jdt.ls.core.product
-Dlog.protocol=true
-Dlog.level=ALL
-Xmx1g
--add-modules=ALL-SYSTEM
--add-opens java.base/java.util=ALL-UNNAMED
--add-opens java.base/java.lang=ALL-UNNAMED
-javaagent: /path/to/lombok
-jar /path/to/jdtls/launcher
-configuration /path/to/linux/config
-data /path/to/data/dir

Project uses groovy gradle with plugins

id 'java'
id 'org.jetbrains.kotlin.jvm' version '2.4.0-Beta2'

Does jdtls require some additional configuration for kotlin?
Or is there something else I'm doing wrong?

To Reproduce
Steps to reproduce the behavior:

1. Open any dual lang project, for example this project
2. Open any java file
3. Use any class, defined in kotlin file

Expected behavior
Kotlin classes are recognized by jdtls

Environment

• Operating System: linux
• JDK version: OpenJDK 26.0.1
• Visual Studio Code version: -
• Java extension version: -