Hangs in "Main thread is Waiting" in tree sitter mode (java-ts-mode)

[CodyRude]

Describe the bug Stuck on "Main thread is waiting" when using java-ts-mode (tree sitter mode) now available in Emacs 29. Using standard java-mode seems to work.

To Reproduce Get tree-sitter grammer for java libtree-sitter-java.so and place in ~/.emacs.d/tree-sitter/ emacs -Q

(package-initialize)

(require 'lsp-mode)
(require 'lsp-java)

(setq major-mode-remap-alist ())
(add-to-list 'major-mode-remap-alist '(java-mode . java-ts-mode))
(add-hook 'java-ts-mode-hook #'lsp)

open test java file

Expected behavior lsp server will initialize and start working

Logs

Params: {
  "processId": 27144,
  "rootPath": "/data1/Code/mage/problem0034",
  "clientInfo": {
    "name": "emacs",
    "version": "GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.38, cairo version 1.17.8)"
  },
  "rootUri": "file:///data1/Code/mage/problem0034",
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      "symbol": {
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    "bundles": [
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      "/home/rude/.emacs.d/.cache/lsp/eclipse.jdt.ls/bundles/dg.jdt.ls.decompiler.cfr-0.0.2-201802221740.jar",
      "/home/rude/.emacs.d/.cache/lsp/eclipse.jdt.ls/bundles/dg.jdt.ls.decompiler.common-0.0.2-201802221740.jar",
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      "file:///data1/Code/mage/countdownmath",
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      "file:///home/rude/cloud/Code/Euler/problem0036",
      "file:///data1/Code/mage/problem0023",
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      "name": "goblinshared"
    },
    {
      "uri": "file:///home/rude/cloud/Code/Goblins/GoblinsServer",
      "name": "GoblinsServer"
    },
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    },
    {
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      "name": "problem0041"
    },
    {
      "uri": "file:///home/rude/cloud/Code/Euler/problem0032/src/main/java/org/mage/problem0032",
      "name": "problem0032"
    },
    {
      "uri": "file:///data1/Code/mage/problem0036/src/main/java/org/mage/problem0036",
      "name": "problem0036"
    },
    {
      "uri": "file:///data1/Code/mage/problem0035",
      "name": "problem0035"
    },
    {
      "uri": "file:///home/rude/cloud/Code/Euler/problem0037",
      "name": "problem0037"
    },
    {
      "uri": "file:///data1/Code/mage/mathutil",
      "name": "mathutil"
    },
    {
      "uri": "file:///home/rude/cloud/Code/Euler/problem0036",
      "name": "problem0036"
    },
    {
      "uri": "file:///data1/Code/mage/problem0023",
      "name": "problem0023"
    },
    {
      "uri": "file:///data1/Code/mage/problem0033",
      "name": "problem0033"
    }
  ]
}

[Trace - 08:21:10 PM] Received notification 'window/logMessage'.
Params: {
  "type": 3,
  "message": "Aug 11, 2023, 8:21:10 PM Main thread is waiting"
}

[huangfeiyu]

I encountered the same issue. @CodyRude have you tried (lsp-semantic-tokens-enable t)? By toggle this on, java-ts-mode is no longer needed. However, I feel the highlight provided by jdtls is confusing and inconsistent. The colors don't make sense to me. Let me show you a screen shot.

[CodyRude]

Hi @huangfeiyu

I get similar results when I use lsp-semantic-tokens-enable, the highlighting is a little confusing. For now, I can continue using the old java-mode. I just struggle with it sometimes, and was hoping the new java-ts-mode would be cleaner.

[thanhvg]

Try this:

(setq lsp-java-format-tab-size 4)

Then restart lsp server.

If it works for you then I can push a fix.

[CodyRude]

Try this:

(setq lsp-java-format-tab-size 4)

Then restart lsp server.

If it works for you then I can push a fix.

Yep, that fixes it. Thank you!!

[marasenna]

@thanhvg

Try this:

(setq lsp-java-format-tab-size 4)

Then restart lsp server.

If it works for you then I can push a fix.

It fixed the launching issue for me too. However, it broke jdtls' snippet expansion (#449). Setting it back to its default value and switching to java-mode doesn't help. I have noticed that sometimes it starts working correctly until you restart emacs or lsp.

Upd: I'm sorry for this confusion. The problem was with the .emacs.d/.cache/lsp/eclipse.jdt.ls, which I updated by reinstalling it when I tried to get lsp-java work with java-ts-mode. Manually downloaded jdtls 1.26.0 milestone works as intended.