How to update jdtls automatically?

[francesco-cadei]

How to update jdtls automatically without downloading manually every time or use magic numbers in the code?

my settings:

(use-package eglot
  :config
  (add-to-list 'eglot-server-programs
	       '(java-mode . ("~/jdt-language-server-1.33.0-202402151717/bin/jdtls")))
  (setq eglot-autoshutdown t)
  :hook
  (java-mode . eglot-ensure) ;; https://download.eclipse.org/jdtls/milestones/?d
  (js-mode . eglot-ensure) ;; npm install -g typescript-language-server typescript
  )

[yveszoundi]

Unless using an auxiliary package (e.g., eglot-java), you'll need to write custom code.

• In eglot-java the initial jdtls installation is performed automatically on your behalf
• If you then need/want to upgrade jdtls, you can call a function that will upgrade it for you

You could take inspiration from eglot-java and wrap eglot-ensure with your own function for java-mode (e.g., francesco/java-eglot-ensure). You probably don't want to check all the time for new versions in the context of "automatic updates" (performance, your ip address will also likely be blocked for abuse...).

(use-package eglot
  :config
  (add-to-list 'eglot-server-programs
	       '(java-mode . ("~/jdt-language-server")))
  (setq eglot-autoshutdown t)
  :hook
  (java-mode . francesco/java-eglot-ensure) ;; https://download.eclipse.org/jdtls/milestones/?d
  (js-mode . eglot-ensure) ;; npm install -g typescript-language-server typescript
  )

(defun francesco/java-eglot-ensure ()
   "This function installs or upgrades automatically jdtls"
   ;; If the jdtls server installation folder doesn't exist at ~/jdt-language-server
      ;; - Lookup the latest jdtls milestone download URL from somewhere
      ;; - Download the jdtls tarball
      ;; - Extract the tarball to ~/jdt-language-server and record somewhere the installed version
      ;; - Remove the downloaded jdtls tarball
   ;; Otherwise we check for new updates, if we haven't checked yet for a week....
      ;; if the latest recorded version by me somewhere in a file is not the latest
      ;; - Download jdtls to a temporary folder similarly to the regular installation
      ;; - Delete the old installation folder
      ;; - Rename the temporary folder to the installation folder
   ;;
   ;; Call eglot-ensure now
)

In eglot-java, I'm looking up the latest jdtls download URL (milestone releases) from https://formulae.brew.sh/api/formula/jdtls.json.

[francesco-cadei]

Thanks! I am waiting the melpa-stable.