Language client is not ready yet

[marian-l]

Reproduction:
Install extension, CTRL-SHIFT-A -> A

[s-arash]

Thanks for opening the issue. Can you tell me what command CTRL-SHIFT-A -> A executes?

[pierzchalski]

@marian-l just in case your issue turned out to be the same as my issue: I was seeing the same problem in the VSCode extension output pane, but after a bit of digging it turned out that the *.jar used by the extension (and also the *.jar from the official releases!) uses a newer class file format:

❯ java -jar org.alloytools.alloy.dist.jar
Error: LinkageError occurred while loading main class org.alloytools.alloy.core.infra.Alloy
        java.lang.UnsupportedClassVersionError: org/alloytools/alloy/core/infra/Alloy has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 55.0

When I switched to openjdk-21 the problem went away and the extension started working.