metals-vscode: Failed to connect with build server

I’m getting the same error now on plugin v13.0. Using openjdk 11 in rhel7. The java home is set correctly. What’s interesting is that the server actually starts. I can connect to it using telnet. When I start the server using the long command it prints me this:

Unable to load nailgun-version.properties.                
NGServer [UNKNOWN] started on address localhost/127.0.0.1 port 8212.                                                 

Then when I start vscode I get the following output:

Nail raised unhandled exception                           
Nail raised unhandled exception

Downgrading the plugin does not work for me now. Last week everything worked fine. Anyone has any ideas what could be the problem?

Solved my own problem. Started tracing back what I’ve done to the environment and found that I had added recently -Dproxy to the env. Commented it out and metals came back to normal.

There seems to be nothing to indicate why it failed at the first place 😕

Let’s keep this open and see if anyone encounters the same issue and maybe we could find more data.

I am not an expert here, but I think those are sockets that operate similar to files like here: https://superuser.com/questions/502875/linux-named-sockets-howto

Thoguh maybe it doesn’t neccessarily help here that much 🤔 I need to dig in there. The approach is already tested in a fork of Bloop https://github.com/scala-cli/bloop-core

That looks like another thing that could be fixed by using named sockets. We will probably be moving to that at some point, since it’s more secure.

I think it’s most likely working with a previous Bloop version. Do you see in the logs what version was started? We might be able to check the changes for the issue that caused it. The release notes are here https://github.com/scalacenter/bloop/releases/tag/v1.4.13

There are two PRs related to Java:

• https://github.com/scalacenter/bloop/pull/1671 - do you have JAVA_HOME set up properly?
• https://github.com/scalacenter/bloop/pull/1657 - this however hould fix things (what does C:\Program Files\Microsoft\jdk-17.0.2.8-hotspot\bin\java -version say?)

Thanks for reporting! Does it work with the previous Metals server version? Does it help if you kill all the Java processes? There has been situations that there was an old broken server running in the background.

Another possible workaround would be to try running the command manually and see why it’s failing (logs should be properly printed, but they don’t seem to be 😕)

C:\Program Files\Microsoft\jdk-17.0.2.8-hotspot\bin\java -Xss4m -XX:MaxInlineLevel=20 -XX:+UseParallelGC -classpath 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jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scalameta\jsonrpc_2.12\0.2.0\jsonrpc_2.12-0.2.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\beachape\enumeratum_2.12\1.5.13\enumeratum_2.12-1.5.13.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\beachape\enumeratum-circe_2.12\1.5.17\enumeratum-circe_2.12-1.5.17.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\ch\epfl\scala\zinc-apiinfo_2.12\1.3.0-M4%2B47-d881fa2f\zinc-apiinfo_2.12-1.3.0-M4%2B47-d881fa2f.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\ch\epfl\scala\zinc-classpath_2.12\1.3.0-M4%2B47-d881fa2f\zinc-classpath_2.12-1.3.0-M4%2B47-d881fa2f.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\ch\epfl\scala\compiler-interface\1.3.0-M4%2B47-d881fa2f\compiler-interface-1.3.0-M4%2B47-d881fa2f.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\thesamet\scalapb\scalapb-runtime_2.12\0.8.0-RC1\scalapb-runtime_2.12-0.8.0-RC1.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-sbt\io_2.12\1.2.0\io_2.12-1.2.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-sbt\util-logging_2.12\1.2.2\util-logging_2.12-1.2.2.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-sbt\util-relation_2.12\1.2.2\util-relation_2.12-1.2.2.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-sbt\sbinary_2.12\0.5.0\sbinary_2.12-0.5.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-sbt\launcher-interface\1.0.0\launcher-interface-1.0.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-lang\modules\scala-parser-combinators_2.12\1.0.5\scala-parser-combinators_2.12-1.0.5.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-sbt\util-control_2.12\1.2.2\util-control_2.12-1.2.2.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-lang\scala-compiler\2.12.11\scala-compiler-2.12.11.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\jcraft\jsch\0.1.46\jsch-0.1.46.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-lang\scala-reflect\2.12.11\scala-reflect-2.12.11.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\eed3si9n\gigahorse-okhttp_2.12\0.3.0\gigahorse-okhttp_2.12-0.3.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\squareup\okhttp3\okhttp-urlconnection\3.7.0\okhttp-urlconnection-3.7.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-lang\modules\scala-xml_2.12\1.0.6\scala-xml_2.12-1.0.6.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-sbt\util-position_2.12\1.0.0\util-position_2.12-1.0.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-sbt\util-cache_2.12\1.0.0\util-cache_2.12-1.0.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\typelevel\macro-compat_2.12\1.1.1\macro-compat_2.12-1.1.1.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\typelevel\cats-macros_2.12\1.1.0\cats-macros_2.12-1.1.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\typelevel\cats-kernel_2.12\1.1.0\cats-kernel_2.12-1.1.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\typelevel\machinist_2.12\0.6.2\machinist_2.12-0.6.2.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\outr\scribe_2.12\2.5.0\scribe_2.12-2.5.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\io\circe\circe-parser_2.12\0.9.3\circe-parser_2.12-0.9.3.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\beachape\enumeratum-macros_2.12\1.5.9\enumeratum-macros_2.12-1.5.9.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\ch\epfl\scala\compiler-bridge_2.12\1.3.0-M4%2B47-d881fa2f\compiler-bridge_2.12-1.3.0-M4%2B47-d881fa2f.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\scala-sbt\util-interface\1.2.2\util-interface-1.2.2.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\thesamet\scalapb\lenses_2.12\0.8.0-RC1\lenses_2.12-0.8.0-RC1.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\lihaoyi\fastparse_2.12\1.0.0\fastparse_2.12-1.0.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\swoval\apple-file-events\1.3.2\apple-file-events-1.3.2.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\jline\jline\2.14.4\jline-2.14.4.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\lmax\disruptor\3.3.6\disruptor-3.3.6.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\eed3si9n\sjson-new-scalajson_2.12\0.8.2\sjson-new-scalajson_2.12-0.8.2.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\eed3si9n\gigahorse-core_2.12\0.3.0\gigahorse-core_2.12-0.3.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\squareup\okhttp3\okhttp\3.7.0\okhttp-3.7.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\eed3si9n\sjson-new-murmurhash_2.12\0.8.0\sjson-new-murmurhash_2.12-0.8.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\outr\scribe-macros_2.12\2.5.0\scribe-macros_2.12-2.5.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\outr\perfolation_2.12\1.0.2\perfolation_2.12-1.0.2.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\io\circe\circe-jawn_2.12\0.9.3\circe-jawn_2.12-0.9.3.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\lihaoyi\fastparse-utils_2.12\1.0.0\fastparse-utils_2.12-1.0.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\eed3si9n\shaded-scalajson_2.12\1.0.0-M4\shaded-scalajson_2.12-1.0.0-M4.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\org\spire-math\jawn-parser_2.12\0.11.1\jawn-parser_2.12-0.11.1.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\typesafe\ssl-config-core_2.12\0.2.2\ssl-config-core_2.12-0.2.2.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\squareup\okio\okio\1.12.0\okio-1.12.0.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\outr\perfolation-macros_2.12\1.0.2\perfolation-macros_2.12-1.0.2.jar;C:\Users\Dragon1573\AppData\Local\Coursier\cache\v1\https\repo1.maven.org\maven2\com\typesafe\config\1.2.0\config-1.2.0.jar bloop.Server 8212

Lastly you could try and set a different JVM for bloop in USER_HOME/.bloop/bloop.json:

{
  "javaHome" : "<path-to-different-JDK>"
}