bug: Cannot debug in Lazyvim

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I have read all the plugin docs
I have searched the existing issues
I have searched the existing issues of plugins related to this issue

Neovim version (nvim -v)

0.11.2

Operating system/version

WSL 2

Describe the bug

Hey,

Since the last update of Neovim, every time I open a .java file (AutoConfiguration for the DAP), I get this error:

dap configuration failed
RPC[Error] code_name = MethodNotFound, message = "No delegateCommandHandler for vscode.java.resolveMainClass"
stack traceback:
...vim/lazy/nvim-java/lua/java-core/utils/error_handler.lua:18: in function 'error_handler'
...ui/.local/share/nvim/lazy/nvim-java/lua/async/runner.lua:25: in function 'callback'
...lazy/nvim-java/lua/java-core/ls/clients/jdtls-client.lua:73: in function 'handler'
/usr/share/nvim/runtime/lua/vim/lsp/client.lua:681: in function ''
vim/_editor.lua: in function <vim/_editor.lua:0>
11:07:10 PM msg_show.echomsg ja ERROR::"workspace/executeCommand failed! arguments: "::{
command = "vscode.java.resolveMainClass"
}::" error: "::{
code = -32601,
message = "No delegateCommandHandler for vscode.java.resolveMainClass",
= {
__tostring = <function 1>
}
}

I think a lot of new commands for DAP were added to the project. (By example: vscode.java.resolveMainClass)

If I disable java_debug_adapter, I no longer get this error in autoconfiguration of DAP, but if I try to run debugger, I encounter almost the same error. (vscode.java.startDebugSession instead of vscode.java.resolveMainClass)

Do you have the same error ?

i use JDTLS 1.54.0, java-debug-adapter 0.58.2 from Mason.

Thank you for your help :)

Steps To Reproduce

This is my config:

return {
  {
    "nvim-java/nvim-java",
    config = function()
      require("java").setup({
        java_debug_adapter = {
          enable = true,
        },
        spring_boot_tools = {
          enable = false,
        },
      })
      require("lspconfig").jdtls.setup({})
      local dap = require("dap")
      dap.configurations.java = {
        {
          mainClass = "",
          projectName = "",
          type = "java",
          request = "attach",
          name = "Debug (Attach) - Remote",
          hostName = "127.0.0.1",
          port = 5005,
        },
      }
    end,
  },
}

Expected Behavior

No error from DAP

We dropped Mason support and migrated to vim.lsp API. Do not use Mason for nvim-java stuff and do not call lspconfig.jdtls.setup.

Hi, you can upgrade nvim-java then you need to change the require("lspconfig").jdtls.setup({}) statement to vim.lsp.enable('jdtls'). You can try again. Please reopen the ticket if not working

Hello, thank you for the feedback.

I found a solution, but I need to specify the vim.lsp.config for jdtls:

return {
  {
    "nvim-java/nvim-java",
    config = function()
      require("java").setup()
      vim.lsp.config("jdtls", {
        name = "jdtls",
        cmd = { "jdtls" },
      })
      vim.lsp.enable("jdtls")
      local dap = require("dap")

      dap.configurations.java = {
        {
          mainClass = "",
          projectName = "",
          type = "java",
          request = "attach",
          name = "Debug (Attach) - Remote",
          hostName = "127.0.0.1",
          port = 5005,
        },
      }
    end,
  },
}

And I manually installed jdtls on my system (using the jdtls command)

I don't know if it is the expected solution...

If I don't specify a vim.lsp.config for jdtls, I get this warning and jdtls doesn't run:

Warn 10:49:19 notify.warn ...im/lazy/nvim-java/lua/java-core/ls/servers/jdtls/cmd.lua:33: attempt to index local 'lsp_config' (a nil value)

Some info in LspInfo:

vim.lsp: Active Clients ~

spring-boot (id: 1)

Version: ? (no serverInfo.version response)

Root directory: ~/dev/esb/forem-service-horizons-emploi

Command: { "/home/guigui/.asdf/installs/java/corretto-21.0.9.11.1//bin/java", "-XX:TieredStopAtLevel=1", "-Xmx1G", "-XX:+UseZGC", "-cp", "/home/guigui/.local/share/nvim/nvim-java/packages/spring-boot-tools/1.55.1/extension/language-server/BOOT-INF/classes:/home/guigui/.local/share/nvim/nvim-java/packages/spring-boot-tools/1.55.1/extension/language-server/BOOT-INF/lib/*", "-Dsts.lsp.client=vscode", "-Dsts.log.file=/dev/null", "-Dspring.config.location=file:/home/guigui/.local/share/nvim/nvim-java/packages/spring-boot-tools/1.55.1/extension/language-server/BOOT-INF/classes/application.properties", "org.springframework.ide.vscode.boot.app.BootLanguageServerBootApp" }

Settings: {
spring_boot = {}
}

Attached buffers: 11

copilot (id: 7)

Version: 1.400.0

Root directory: ~/dev/esb/forem-service-horizons-emploi

Command: { "node", "--experimental-sqlite", "/home/guigui/.local/share/nvim/lazy/copilot.lua/copilot/js/language-server.js", "--stdio" }

Settings: {
telemetry = {
telemetryLevel = "all"
}
}

Attached buffers: 11

vim.lsp: Enabled Configurations ~

jdtls:

capabilities: {
textDocument = {
completion = {
completionItem = {
commitCharactersSupport = false,
deprecatedSupport = true,
documentationFormat = { "markdown", "plaintext" },
insertReplaceSupport = true,
insertTextModeSupport = {
valueSet = { 1 }
},
labelDetailsSupport = true,
preselectSupport = false,
resolveSupport = {
properties = { "documentation", "detail", "additionalTextEdits", "command", "data" }
},
snippetSupport = true,
tagSupport = {
valueSet = { 1 }
}
},
completionList = {
itemDefaults = { "commitCharacters", "editRange", "insertTextFormat", "insertTextMode", "data" }
},
contextSupport = true,
insertTextMode = 1
}
},
workspace = {
fileOperations = {
didRename = true,
willRename = true
}
}
}

And this page is still good ? https://github.com/nvim-java/nvim-java/wiki/Lazyvim

And this page is still good ? https://github.com/nvim-java/nvim-java/wiki/Lazyvim
This is actually outdated. You shouldn't have to do any of this though. Do you have your config in github?

Can you try deleting ~/.local/share/nvim/lazy directory and re-installing all plugins from scratch?

With this configuration :

return {
  {
    "nvim-java/nvim-java",
    config = function()
      require("java").setup()
      vim.lsp.enable("jdtls")
      local dap = require("dap")

      dap.configurations.java = {
        {
          mainClass = "",
          projectName = "",
          type = "java",
          request = "attach",
          name = "Debug (Attach) - Remote",
          hostName = "127.0.0.1",
          port = 5005,
        },
      }
    end,
  },
}

After deleting ~/.local/share/nvim/lazy, I still get this warning :

Warn 10:49:19 notify.warn ...im/lazy/nvim-java/lua/java-core/ls/servers/jdtls/cmd.lua:33: attempt to index local 'lsp_config' (a nil value)

And jdtls is not running.

Could you try upgrading to the latest stable version. 0.11.5. That must be it.

I installed version 0.11.5 and it works well !
Thanks for the help and the great work !

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bug: Cannot debug in Lazyvim #448

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bug: Cannot debug in Lazyvim #448

Description

Did you check docs and existing issues?

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Describe the bug

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Expected Behavior

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logrusx commented on Dec 10, 2025

s1n7ax commented on Dec 10, 2025

organix7 commented on Dec 10, 2025

s1n7ax commented on Dec 10, 2025

organix7 commented on Dec 10, 2025

s1n7ax commented on Dec 10, 2025

organix7 commented on Dec 10, 2025

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