Project wide LSP problems should not appear in the current buffer.

[hsanson]

Using eclipselsp linter in a very small project we can see the following communication between ALE and the LSP:

{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///home/ryujin/Projects/gradle-simple/src/main/java/Hello.java","diagnostics":[{"range":{"start":{"line":9,"character":18},"end":{"line":9,"character":33}},"severity":1,"code":"33554506","source":"Java","message":"Cannot make a static reference to the non-static field World.WORLD_STR"}]}}'
  9.377725 : looking for messages on channels
  9.377753 on 1: Invoking channel callback <SNR>95_VimOutputCallback
  9.378889 RECV on 1: 'Content-Length: 123

{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"2019/05/21 13:11:07 Validated 1. Took 286 ms"}}'
  9.394634 on 1: Invoking channel callback <SNR>95_VimOutputCallback
  9.396934 RECV on 1: 'Content-Length: 131

{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"2019/05/21 13:11:07 \u003e\u003e build jobs finished"}}'
  9.408564 : looking for messages on channels
  9.409045 on 1: Invoking channel callback <SNR>95_VimOutputCallback
  9.410353 RECV on 1: 'Content-Length: 419

{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///home/ryujin/Projects/gradle-simple","diagnostics":[{"range":{"start":{"line":0,"character":0},"end":{"line":0,"character":0}},"severity":2,"code":"0","source":"Java","message":"Build path specifies execution environment JavaSE-1.8. There are no JREs installed in the workspace that are strictly compatible with this environment. "}]}}'
  9.410358 : looking for messages on channels
  9.410382 on 1: Invoking channel callback <SNR>95_VimOutputCallback
  9.413103 RECV on 1: 'Content-Length: 343

{"jsonrpc":"2.0","method":"textDocument/publishDiagnostics","params":{"uri":"file:///home/ryujin/Projects/gradle-simple/src/main/java/World.java","diagnostics":[{"range":{"start":{"line":2,"character":7},"end":{"line":2,"character":24}},"severity":2,"code":"268435844","source":"Java","message":"The import java.util.HashSet is never used"}]}}Content-Length: 171

The fourth entry in the list of problems shows a project-wide error regarding missing JRE installation. The uri does not match the current buffer file Hello.java, instead it is the project root path "uri":"file:///home/username/Projects/gradle-simple".

This error appears in the current buffer in line 0, column 0 which makes no sense. Even worse, all other errors that do belong to the file in the current buffer are not shown.

By contrast, in VSCode, the project-wide error regarding JRE is shown in the log window of the editor while the other errors are shown correctly in the editor buffer.

These project-wide errors should better be shown in the ALEInfo output instead of the buffer. Maybe checking if the "uri" parameter matches the current buffer or the project root is a way to determine if the error should be shown in the ALEInfo output or the buffer.

In addition the ecipselsp provides a lot of log information as below:

{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"2019/05/21 13:11:07 1 problems reported for /Hello.java"}}'
  9.369829 : looking for messages on channels
  9.369839 on 1: Invoking channel callback <SNR>95_VimOutputCallback
  9.377717 RECV on 1: 'Content-Length: 371

{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"2019/05/21 13:11:07 Validated 1. Took 286 ms"}}'
  9.394634 on 1: Invoking channel callback <SNR>95_VimOutputCallback
  9.396934 RECV on 1: 'Content-Length: 131

{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":3,"message":"2019/05/21 13:11:07 \u003e\u003e build jobs finished"}}'
  9.408564 : looking for messages on channels
  9.409045 on 1: Invoking channel callback <SNR>95_VimOutputCallback
  9.410353 RECV on 1: 'Content-Length: 419

Maybe showing these messages in the output of ALEInfo can be beneficial. These messages allowed me to find the problem and fix #2520 .

[w0rp]

I plan to eventually add logging of all messages. See #2137.

I'm not sure why diagnostics wouldn't appear or would appear in the wrong place. That shouldn't happen. Have a look at s:HandleLSPDiagnostics in autoload/ale/lsp_linter.vim and see if you can find out what's going wrong there.

[w0rp]

Fixed in #2524.