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Unable to start language server: C/C++ Language Server [message #1798877]

Mon, 26 November 2018 22:18

Adriano Carvalho

Messages: 54
Registered: November 2018

Member

Hi,

I've followed the steps in here but when I "Run As > Eclipse Application" I get the following:

Quote:

!ENTRY org.eclipse.lsp4e 4 0 2018-11-26 22:03:43.950
!MESSAGE Unable to start language server: C/C++ Language Server: org.eclipse.lsp4e.cpp.language.CPPLanguageServer@1
!STACK 0
java.io.IOException: Unable to start language server: C/C++ Language Server: org.eclipse.lsp4e.cpp.language.CPPLanguageServer@1
at org.eclipse.lsp4e.server.ProcessStreamConnectionProvider.start(ProcessStreamConnectionProvider.java:44)
at org.eclipse.lsp4e.LoggingStreamConnectionProviderProxy.start(LoggingStreamConnectionProviderProxy.java:178)
at org.eclipse.lsp4e.LanguageServerWrapper.start(LanguageServerWrapper.java:202)
at org.eclipse.lsp4e.LanguageServiceAccessor.getLSWrapperForConnection(LanguageServiceAccessor.java:340)
at org.eclipse.lsp4e.LanguageServiceAccessor.getLSWrappers(LanguageServiceAccessor.java:299)
at org.eclipse.lsp4e.LanguageServiceAccessor.getLSPDocumentInfosFor(LanguageServiceAccessor.java:444)
at org.eclipse.lsp4e.operations.codelens.CodeLensProvider.lambda$0(CodeLensProvider.java:35)
at java.util.concurrent.CompletableFuture$AsyncSupply.run(Unknown Source)
at java.util.concurrent.CompletableFuture$AsyncSupply.exec(Unknown Source)
at java.util.concurrent.ForkJoinTask.doExec(Unknown Source)
at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(Unknown Source)
at java.util.concurrent.ForkJoinPool.runWorker(Unknown Source)
at java.util.concurrent.ForkJoinWorkerThread.run(Unknown Source)

(and several other slightly different error messages. The title, however, is always the same: "Unable to start language server: C/C++ Language Server").

I am using Eclipse for Committers 4.9.0.
I have loaded cdt.target and ctd-baseline.

In the Problems View I see:
- Two unused API errors.
- A bunch (more than 20) of: 'Automatic-Module-Name' header is required to be discoverable as a Java module in a Java modular setup (Java 9 and later)

Am I missing some dependency?
Is the default "Run As > Eclipse Application" enough?
Should I try Eclipse for Committers 4.8.0?

Best regards.

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Re: Unable to start language server: C/C++ Language Server [message #1798880 is a reply to message #1798877]

Tue, 27 November 2018 02:33

Adriano Carvalho

Messages: 54
Registered: November 2018

Member

I've found the problem. Now it works with no problems.

When importing projects from the repository I have selected/imported all projects. If I do not select/import any of the "org.eclipse.lsp4e" projects everything works fine.

From going through some of the code, "org.eclipse.lsp4e" seems to be related to clang and since I don't have it installed it doesn't work. I don't think I need this but I it would be good to know what needs to be installed for it to work. Can anyone point out what should be installed?

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Re: Unable to start language server: C/C++ Language Server [message #1798895 is a reply to message #1798880]

Tue, 27 November 2018 06:56

Hannes Vogt

Messages: 6
Registered: July 2018

Junior Member

I think it needs clangd, though I am not sure if just installing is enough. If you don't want to use it, the best option is what you already did: close the lsp related projects.

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