LSP not working with Gradle Kotlin build script DSL

[lescx]

Currently, when setting up a new Gradle project with Kotlin as the build script DSL (which is the default), the jdt.ls does not work.

Steps to reproduce

1. Initialize a new Gradle project with default values and Java target version 17:

$ gradle init

[…]

Enter target Java version (min: 7, default: 21): 17

[…]

2. Open a .java file in the project in Helix and hover with the cursor over e.g. a class:

Expected behaviour

When choosing Groovy instead of Kotlin, the LSP does its job and auto-completions etc. work:

Versions

• jdtls 1.34.0; build from source
• OpenJDK Runtime Environment (build 17.0.10+7-Debian-1)
• Gradle 8.7
• Debian testing (trixie)
• Kernel 6.6.17-01102-gd3cec3c11146
• Helix 24.3 (2cadec0b)

LSP/Helix Logs

• hx app/src/main/java/org/example/App.java
• wait until LSP is fully loaded
• Hover over System class
• Get no documentation
• Close editor :q

~/.cache/helix/helix.log

2024-04-05T23:09:10.398 helix_lsp::transport [ERROR] jdtls err <- "WARNING: Using incubator modules: jdk.incubator.foreign, jdk.incubator.vector\n"
2024-04-05T23:09:10.797 helix_lsp::transport [ERROR] jdtls err <- "Apr 05, 2024 11:09:10 PM org.apache.aries.spifly.BaseActivator log\n"
2024-04-05T23:09:10.797 helix_lsp::transport [ERROR] jdtls err <- "INFO: Registered provider ch.qos.logback.classic.servlet.LogbackServletContainerInitializer of service jakarta.servlet.ServletContainerInitializer in bundle ch.qos.logback.classic\n"
2024-04-05T23:09:10.800 helix_lsp::transport [ERROR] jdtls err <- "Apr 05, 2024 11:09:10 PM org.apache.aries.spifly.BaseActivator log\n"
2024-04-05T23:09:10.800 helix_lsp::transport [ERROR] jdtls err <- "INFO: Registered provider ch.qos.logback.classic.spi.LogbackServiceProvider of service org.slf4j.spi.SLF4JServiceProvider in bundle ch.qos.logback.classic\n"
2024-04-05T23:09:14.603 helix_term::application [WARN] Ignoring a client/registerCapability request because dynamic capability registration is not enabled. Please report this upstream to the language server
2024-04-05T23:09:17.206 helix_lsp::client [WARN] language server failed to terminate gracefully - failed to parse: invalid type: map, expected unit

[rofe33]

The same goes for jdtls on neovim. If the project was initialized with gradle and kotlin as build script DSL. The jdtls doesn't work. However, if the project is created with gradle and groovy jdtls will work, and it will work with mvn. Also if the file is a non-project file, the jdtls will work and tell us.

Versions

• neovim: NVIM v0.9.5
• jdtls: v1.33.0 (installed using mason, from the eclipse website)
• gradle 8.7
• Kernel: linux-lts 6.6.25-1

Jdtls log

[ERROR][2024-04-09 17:08:08] ...lsp/handlers.lua:535	"Apr 9, 2024, 5:08:08 PM file:///home/user/project/app/src/main/java/org/example/App.java does not resolve to a ICompilationUnit"

Note: I am new to java, gradle... However, for some unknown reasons, after trying groovy. The jdtls worked with build script kotlin. However, I was stuck like 2 hours trying to figure out, why jdtls is not working when I am using gradle.