"Unable to find single point of entry" after lsp-java-update-server

[langston-barrett]

Describe the bug After running lsp-java-update-server for the first time, I now see

File local-variables error: (error Unable to find single point of entry (/home/<user>/.emacs.d/eclipse.jdt.ls/server/plugins/org.eclipse.equinox.launcher_1.5.200.v20180922-1751.jar /home/<user>/.emacs.d/eclipse.jdt.ls/server/plugins/org.eclipse.equinox.launcher_1.5.500.v20190715-1310.jar))

when opening a Java file, and no LSP functionality is available.

lsp-java version: 20191003.1532

[langston-barrett]

I was able to fix this by removing the server installation entirely:

rm -rf ~/.emacs.d/eclipse.jdt.ls/server/

I was then prompted to install the server, which I did.

[didibus]

Got the same issue, removing the folder and restarting fixed it as well.

[stardiviner]

Same issue, remove server/ folder, and execute lsp-java-update-server command fixed issue.

[lbolla]

The problem is with this function:

(defun lsp-java--locate-server-jar ()
  "Return the jar file location of the language server.

The entry point of the language server is in `lsp-java-server-install-dir'/plugins/org.eclipse.equinox.launcher_`version'.jar."
  (pcase (f-glob "org.eclipse.equinox.launcher_*.jar" (expand-file-name "plugins" lsp-java-server-install-dir))
    (`(,single-entry) single-entry)
    (`nil nil)
    (server-jar-filenames
     (error "Unable to find single point of entry %s" server-jar-filenames))))

After an upgrade, many files like these coexist, hence confusing the above function:

~ » ll /home/lbolla/.emacs.d/.cache/lsp/eclipse.jdt.ls/plugins/*equinox.launcher_*
-rw-rw-r-- 1 lbolla lbolla 53088 Jul 23 11:45 /home/lbolla/.emacs.d/.cache/lsp/eclipse.jdt.ls/plugins/LB_LEGACY_org.eclipse.equinox.launcher_1.5.700.v20200207-2156.jar
-rw-rw-r-- 1 lbolla lbolla 53255 Sep 18 17:58 /home/lbolla/.emacs.d/.cache/lsp/eclipse.jdt.ls/plugins/LB_LEGACY_org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar
-rw-rw-r-- 1 lbolla lbolla 53322 Nov 20 17:38 /home/lbolla/.emacs.d/.cache/lsp/eclipse.jdt.ls/plugins/org.eclipse.equinox.launcher_1.6.0.v20200915-1508.jar

I had to rename the old ones above prepending the "LB_LEGACY_" to make it work.

Ideally, the function above should ignore the old entries and just pick up the latest available. Alternatively, cleaning up the whole installation before an upgrade seems a viable brute force solution.

[yyoncho]

@lbolla the bug is that we don't delete the old one, ATM you should delete the server and install it again otherwise you are risking random issues.