jsonrpc internal error with no detail on the nature of the error

[tribbloid]

Error while consuming 'textDocument/documentHighlight' with language server 'Scala Language Server (Metals)'

org.eclipse.lsp4j.jsonrpc.ResponseErrorException: Internal error.
	at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.handleResponse(RemoteEndpoint.java:209)
	at org.eclipse.lsp4j.jsonrpc.RemoteEndpoint.consume(RemoteEndpoint.java:193)
	at com.redhat.devtools.lsp4ij.LanguageServerWrapper.lambda$start$4(LanguageServerWrapper.java:315)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1804)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.exec(CompletableFuture.java:1796)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:507)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1491)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:2073)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:2035)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:187)

strangely, the stack doesn't contain any lsp4ij class, the only evidence is from the IDEA error reporting interface, so no idea how to refine it so far

[aboutZZ]

+1 same problem here.

• First, LSP console did not print the full exception stack trace

• Second, I configured error reporting to the log file, but I did not see the error logs of the LSP plugin in the idea.log.
  
  

[angelozerr]

Internal error means that the error comes from the language server if I remember.

In Log means, showing error in the Log tab of the lsp console

[tribbloid]

@angelozerr totally possible, in which case the client side should log as much info about requests/responses as possible.

IOException is obviously not relevant here

[angelozerr]

I agree but I dont know how to reproduce your usecase and I am not sure if I can do something since this trace is managed by LSP4J (not LSP4IJ).

[angelozerr]

@tribbloid @aboutZZ Please explain me how to reproduce your issue;