Issue starting stack

[FredericDesgreniers]

I keep getting this in the "events log" in intellij.

[project-stack-repl-test1:lib] Could not start Stack REPL. Make sure you have set right path to Stack in Settings

[project-stack-repl-test1:lib] Error message while trying to start Stack REPL: java.util.LinkedHashMap cannot be cast to java.lang.String

I can use "stack repl" fine from the command line

[sir4ur0n]

Which version do you use? The stable release or the beta? If beta, which version are you currently using?

Do you have a sample project to reproduce?

[FredericDesgreniers]

I'm running 1.0.0-beta34 because I was getting another issue that got fixed on beta. For some reason, upgrading my stack installation to the git branch and then downgrading back fixed the issue even through I'm now at the same version I was initially and uninstalling + reinstalling stack didn't fix it earlier. I can't reproduce it anymore.

[jorge-barroso]

This is happening for me on any recent stable version with both java 11 and java 14 (openjdk on linux) It's simple to reproduce as it happens every time with new and existing projects. I can't talk about past releases because I'm just learning haskell now so I just installed both stack and the plugin but I made sure my config.yaml is configured with the basic details

Version: 1.0.0beta78 and 1.0.0beta76 Intellij Idea: Latest 2020.2

Stack Trace: java.lang.ClassCastException: class java.util.LinkedHashMap cannot be cast to class java.lang.String (java.util.LinkedHashMap and java.lang.String are in module java.base of loader 'bootstrap') at intellij.haskell.stackyaml.StackYamlComponent$.$anonfun$getResolver$2(StackYamlComponent.scala:30) at scala.Option.map(Option.scala:242) at intellij.haskell.stackyaml.StackYamlComponent$.getResolver(StackYamlComponent.scala:30) at intellij.haskell.external.component.CabalConfigComponent$.getAvailablePackageNames(CabalConfigComponent.scala:22) at intellij.haskell.external.component.GlobalProjectInfoComponent$.getAvailableStackagesPackages(GlobalProjectInfoComponent.scala:54) at intellij.haskell.external.component.GlobalProjectInfoComponent$.$anonfun$createGlobalProjectInfo$2(GlobalProjectInfoComponent.scala:72) at scala.Option.map(Option.scala:242) at intellij.haskell.external.component.GlobalProjectInfoComponent$.$anonfun$createGlobalProjectInfo$1(GlobalProjectInfoComponent.scala:68) at scala.Option.flatMap(Option.scala:283) at intellij.haskell.external.component.GlobalProjectInfoComponent$.createGlobalProjectInfo(GlobalProjectInfoComponent.scala:67) at intellij.haskell.external.component.GlobalProjectInfoComponent$.$anonfun$Cache$1(GlobalProjectInfoComponent.scala:32) at com.github.blemale.scaffeine.CacheLoaderAdapter.load(CacheLoaderAdapter.java:22) at com.github.benmanes.caffeine.cache.LocalLoadingCache.lambda$newMappingFunction$2(LocalLoadingCache.java:141) at com.github.benmanes.caffeine.cache.UnboundedLocalCache.lambda$computeIfAbsent$2(UnboundedLocalCache.java:238) at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1708) at com.github.benmanes.caffeine.cache.UnboundedLocalCache.computeIfAbsent(UnboundedLocalCache.java:234) at com.github.benmanes.caffeine.cache.LocalCache.computeIfAbsent(LocalCache.java:108) at com.github.benmanes.caffeine.cache.LocalLoadingCache.get(LocalLoadingCache.java:54) at com.github.blemale.scaffeine.LoadingCache.get(LoadingCache.scala:35) at intellij.haskell.external.component.GlobalProjectInfoComponent$.findGlobalProjectInfo(GlobalProjectInfoComponent.scala:36) at intellij.haskell.external.component.HaskellComponentsManager$.getGhcVersion(HaskellComponentsManager.scala:102) at intellij.haskell.util.HaskellProjectUtil$.setNoDiagnosticsShowCaretFlag(HaskellProjectUtil.scala:42) at intellij.haskell.external.execution.StackCommandLine$.ghcOptions(StackCommandLine.scala:128) at intellij.haskell.external.execution.StackCommandLine$.buildInMessageView(StackCommandLine.scala:140) at intellij.haskell.external.execution.StackCommandLine$.buildProjectDependenciesInMessageView(StackCommandLine.scala:124) at intellij.haskell.external.component.StackProjectManager$$anon$2.run(StackProjectManager.scala:193) at com.intellij.openapi.progress.impl.CoreProgressManager$TaskRunnable.run(CoreProgressManager.java:935) at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcessWithProgressAsync$5(CoreProgressManager.java:442) at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$3(ProgressRunner.java:235) at com.intellij.openapi.progress.impl.CoreProgressManager.lambda$runProcess$2(CoreProgressManager.java:170) at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:629) at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:581) at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:60) at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:157) at com.intellij.openapi.progress.impl.ProgressRunner.lambda$submit$4(ProgressRunner.java:235) at java.base/java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1764) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:668) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1$1.run(Executors.java:665) at java.base/java.security.AccessController.doPrivileged(AccessController.java:391) at java.base/java.util.concurrent.Executors$PrivilegedThreadFactory$1.run(Executors.java:665) at java.base/java.lang.Thread.run(Thread.java:832)

[s-till]

I encountered this issue as well. versions:

• IntelliJ IDEA 2020.1 (IU-201.6668.121, built on April 8, 2020)
• java-8-openjdk (1.8.0_262)
• stack version: 2.3.1, Git revision de2a7b694f07de7e6cf17f8c92338c16286b2878

As per the comment in #599 changing the resolver from map to string in stack.yaml resolves the issue for myself.

from:

resolver:
  url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/10.yaml

to:

resolver: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/16/10.yaml

not a haskell expert, so unsure of the effects this change may have further down the line, but this got me up and running.

[rikvdkleij]

@untitled121 No further effects but using resolver: lts-16.10 is just shorter 😄