The copilot plugin failed to start in webstorm ide version 2024.3.3 #152449

HanZephyr · 2025-02-26T03:23:08Z

HanZephyr
Feb 26, 2025

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I installed the GitHub Copilot plugin in the WebStorm IDE. After restarting the IDE, I encountered an error indicating java.lang.NoClassDefFoundError: com/intellij/ide/highlighter/JavaFileType. And I'm unable to properly trigger code completion, rendering the plugin unusable. However, the Copilot chat feature functions correctly. What could be the cause of this issue, and how can it be resolved?

WebStorm version: 2024.3.3, Build #WS-243.24978.60, built on February 13, 2025.

GitHub Copilot plugin version: 1.5.35.8996-242-nightly.

Error details:

java.lang.NoClassDefFoundError: com/intellij/ide/highlighter/JavaFileType
	at com.github.copilot.platform.utils.VirtualFileKt.isJavaFile(VirtualFile.kt:19)
	at com.github.copilot.completion.context.provider.ContextProvider$Companion.contextForFile(ContextProvider.kt:58)
	at com.github.copilot.completion.context.provider.ContextProvider$Companion.contextForFile(ContextProvider.kt:63)
	at com.github.copilot.completion.context.provider.ContextProvider.contextForFile(ContextProvider.kt)
	at com.github.copilot.lang.agent.CopilotAgentCompletionService.fetchInlineCompletions(CopilotAgentCompletionService.java:92)
	at com.github.copilot.inline.CopilotInlineCompletionProviderBase.fetchCompletions(CopilotInlineCompletionProviderBase.kt:172)
	at com.github.copilot.inline.CopilotInlineCompletionProviderBase.fetchCompletions(CopilotInlineCompletionProviderBase.kt:107)
	at com.github.copilot.inline.CopilotInlineCompletionProviderBase.getSuggestionDebounced$suspendImpl(CopilotInlineCompletionProviderBase.kt:40)
	at com.github.copilot.inline.CopilotInlineCompletionProviderBase.getSuggestionDebounced(CopilotInlineCompletionProviderBase.kt)
	at com.intellij.codeInsight.inline.completion.DebouncedInlineCompletionProvider.debounce(DebouncedInlineCompletionProvider.kt:75)
	at com.intellij.codeInsight.inline.completion.DebouncedInlineCompletionProvider$debounce$1.invokeSuspend(DebouncedInlineCompletionProvider.kt)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:608)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:873)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:763)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:750)
Caused by: java.lang.ClassNotFoundException: com.intellij.ide.highlighter.JavaFileType PluginClassLoader(plugin=PluginDescriptor(name=GitHub Copilot, id=com.github.copilot, descriptorPath=plugin.xml, path=~\AppData\Roaming\JetBrains\WebStorm2024.3\plugins\github-copilot-intellij, version=1.5.35.8996-242-nightly, package=null, isBundled=false), packagePrefix=null, state=active, parents=PluginDescriptor(name=GitHub, id=org.jetbrains.plugins.github, moduleName=intellij.vcs.github/tracker, descriptorPath=intellij.vcs.github.tracker.xml, path=~\AppData\Roaming\JetBrains\WebStorm2024.3\plugins\vcs-github-ultimate, version=243.24978.79-ultimate, package=org.jetbrains.plugins.github.tasks, isBundled=false), PluginDescriptor(name=Git, id=Git4Idea, moduleName=intellij.vcs.git/terminal, descriptorPath=intellij.vcs.git.terminal.xml, path=~\AppData\Local\Programs\WebStorm\plugins\vcs-git, version=243.24978.60, package=git4idea.terminal, isBundled=true), PluginDescriptor(name=Git, id=Git4Idea, moduleName=intellij.vcs.git/newUiOnboarding, descriptorPath=intellij.vcs.git.newUiOnboarding.xml, path=~\AppData\Local\Programs\WebStorm\plugins\vcs-git, version=243.24978.60, package=git4idea.newUiOnboarding, isBundled=true), PluginDescriptor(name=GitHub, id=org.jetbrains.plugins.github, moduleName=intellij.vcs.github.ultimate/cron, descriptorPath=intellij.vcs.github.ultimate.cron.xml, path=~\AppData\Roaming\JetBrains\WebStorm2024.3\plugins\vcs-github-ultimate, version=243.24978.79-ultimate, package=com.intellij.vcs.github.ultimate.cron, isBundled=false), PluginDescriptor(name=GitHub, id=org.jetbrains.plugins.github, moduleName=intellij.vcs.github.ultimate/docker, descriptorPath=intellij.vcs.github.ultimate.docker.xml, path=~\AppData\Roaming\JetBrains\WebStorm2024.3\plugins\vcs-github-ultimate, version=243.24978.79-ultimate, package=com.intellij.vcs.github.ultimate.action.runs.docker, isBundled=false), PluginDescriptor(name=Git, id=Git4Idea, moduleName=intellij.vcs.git.coverage, descriptorPath=intellij.vcs.git.coverage.xml, path=~\AppData\Local\Programs\WebStorm\plugins\vcs-git, version=243.24978.60, package=com.intellij.vcs.git.coverage, isBundled=true), PluginDescriptor(name=IDEA CORE, id=com.intellij, moduleName=intellij.platform.vcs.impl, descriptorPath=intellij.platform.vcs.impl.xml, path=~\AppData\Local\Programs\WebStorm\lib, version=243.24978.60, package=null, isBundled=true), PluginDescriptor(name=IDEA CORE, id=com.intellij, moduleName=intellij.platform.vcs.log.impl, descriptorPath=intellij.platform.vcs.log.impl.xml, path=~\AppData\Local\Programs\WebStorm\lib, version=243.24978.60, package=null, isBundled=true), PluginDescriptor(name=IDEA CORE, id=com.intellij, moduleName=intellij.platform.vcs.dvcs.impl, descriptorPath=intellij.platform.vcs.dvcs.impl.xml, path=~\AppData\Local\Programs\WebStorm\lib, version=243.24978.60, package=null, isBundled=true), PluginDescriptor(name=IDEA CORE, id=com.intellij, moduleName=intellij.platform.collaborationTools, descriptorPath=intellij.platform.collaborationTools.xml, path=~\AppData\Local\Programs\WebStorm\lib, version=243.24978.60, package=null, isBundled=true), PluginDescriptor(name=Git, id=Git4Idea, descriptorPath=plugin.xml, path=~\AppData\Local\Programs\WebStorm\plugins\vcs-git, version=243.24978.60, package=git4idea, isBundled=true), PluginDescriptor(name=GitHub, id=org.jetbrains.plugins.github, descriptorPath=plugin.xml, path=~\AppData\Roaming\JetBrains\WebStorm2024.3\plugins\vcs-github-ultimate, version=243.24978.79-ultimate, package=com.intellij.vcs.github.ultimate, isBundled=false), )
	at com.intellij.ide.plugins.cl.PluginClassLoader.loadClass(PluginClassLoader.kt:157)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)
	... 17 more

Answered by Spotnag

Feb 26, 2025

Hello, i have exactly the same error in Goland after upgrading to the nightly version stated above. Once i reverted back to the stable version auto completions are working and the error is gone.

View full answer

2025-02-26T03:23:33Z

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bot Feb 26, 2025

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0 replies

Spotnag · 2025-02-26T12:56:05Z

Spotnag
Feb 26, 2025

Hello, i have exactly the same error in Goland after upgrading to the nightly version stated above. Once i reverted back to the stable version auto completions are working and the error is gone.

2 replies

HanZephyr Feb 26, 2025
Author

Thank you so much!!! After I adjusted the update channel to stable like you, the re-installation is normal! It seems that the latest version has some bugs

rbroggi Feb 27, 2025

it seems that they promoted to stable the buggy version and I got the error on Goland this morning.

okku · 2025-02-27T12:18:21Z

okku
Feb 27, 2025

I did downgrade both webstorm and the plugin, then it works again.
WebStorm 2024.2.5 and plugin 1.5.33-242

0 replies

happybydefault · 2025-02-27T12:44:01Z

happybydefault
Feb 27, 2025

I had the same problem with the latest stable versions of GoLand (2024.3.3) and Rider (2024.3.5), both using the latest stable version of Copilot (1.5.36-242). I imagine this is related to the fact that since Copilot 1.5.36, the plugin uses the IDE's inline completions API.

I was able to solve this by downloading Copilot 1.5.35-242 from JetBrains as a zip and then installing it from disk.

https://plugins.jetbrains.com/plugin/17718-github-copilot/versions/stable

5 replies

pkcakeout Feb 27, 2025

Tried this as well for PyCharm but it does not work because PyCharm now is on build *-243 and there are only builds for *-242 and below of copilot! Still good one to remind people of!

happybydefault Feb 27, 2025

GoLand is also on 243., and I'm using Copilot's -242 without a problem. Maybe you accidentally tried Copilot's -241, which for whatever reason is listed before -242 in the link I shared.

happybydefault Feb 27, 2025

My point is that I think1.5.35-242 (and not 1.5.35-241) should definitely work with 243. IDEs. It does work for me.

happybydefault Feb 27, 2025

From the link I shared. See the compatibility range:

pkcakeout Feb 27, 2025

Thanks for your response. Not sure what I did incorrectly, I thought that I tried the 5 most recent releases, kind of blindly to see if they would work, but to no avail. PEBCAK most likely.

But 1.5.35-242 does indeed install and work! Big thanks for finding this.

delasource · 2025-02-27T17:55:21Z

delasource
Feb 27, 2025

i was on stable and encountered the same problem. While i was researching this discussion, they released version 1.5.37 which fixes it. :)

0 replies

bofm · 2025-02-27T19:18:38Z

bofm
Feb 27, 2025

Got the same on the latest PyCharm CE. The free Copilot worked well. Then I purchased and then I can't use it.

1 reply

happybydefault Feb 27, 2025

See /~https://github.com/orgs/community/discussions/152449#discussioncomment-12342516

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The copilot plugin failed to start in webstorm ide version 2024.3.3 #152449

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The copilot plugin failed to start in webstorm ide version 2024.3.3 #152449

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HanZephyr Feb 26, 2025
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